H870 & h570?

[TDC]

I've been going through some old powders I bought over 30 years ago. I found 3 pounds of H870 and 2 pounds of H570 in the old Hodgdon containers sealed and unopened. I know these are discontinued powders but I'm curious as to whether they have any current applications and if there is any loading data available. From the charts I see 870 is still considered an extremely slow burning powder. No reference to the 570.

If anyone in my area has a use for them I'd be willing to trade for something I could use. (F to F only) PM me..

TDC

[BerdanIII]

I'll poke around and see if I can find any data. Any 'druthers on calibers?

[Ole]

Heavy bullets in 7mm Mag is what I use H870 for.

It works great for the 160's and the 175's.

I tried it in my 8mm Mag and was kind of disappointed.

I've read it also works in 257 Weatherby and 264 Win Mag as well.

[Ricochet]

IIRC H570 is an extruded powder with similar burning characteristics to H870. If that's the case, I'll bet it's surplus IMR 5010. Several people on here have a good bit of experience with that.

[TDC]

I'm not sure why I bought these powders in the first place. I can't find any of my old data on either. The best I can recall is that I wanted to try it in my Ruger No.1's in .270, 7mm and .338. Those calibers are 1-B models with a medium heavy 26" barrel and I guess .870 seemed adaptable to them at the time. I do remember trying .870 in the .338 with cast boolits and not being happy with it.

Thanks for the comments and suggestions. If any info should pop up I'd appreciate hearing it.....

TDC

[Hardcast416taylor]

You got me to thinking now about H 870. I seem to remember Hodgon giving this powder out free to anybody sending them 3 inner seals from their powders. I seem to remember getting 3 or 4 lbs. of the stuff and using it in my 7mm Rem. mag.Robert

[dualsport]

Ditto, also looking for CB loads with this powder. Anyone tried duplex loads with this stuff? A little Bullseye on top of the primer might help it burn cleaner.

[TDC]

Hmmmm.... I don't remember getting mine for free...

After doing a little more research I've found several people who rave about it for for use in the 7mm Rem. Mag, as OLE has said, in the heavier boolits.... It seems calibers on both sides of that caliber don't fare so well.

Yikes!! I don't know about the risk of a duplex load utilizing BE over the primer. 870 may ba a very slow powder but if you happened to put a small but double charge of BE over the primer it could get interesting....

Looks like I have a few cans of lawn fertilizer.....:)

[9.3X62AL]

I have seen references to H-870 being pretty close to or much like the WC-860 or WC-872 surplus stuff that many of us here have used in a number of applications.

As for WC-860, its burn speed is just slightly ahead of Kingsford Charcoal. I have used it in the 6.5 x 55 Swede, 55.0 grains under a 140 grain J-word. It gave 1894-level ballistics, about 2450-2475 FPS, from a 22" Ruger barrel, and good accuracy.

I have also duplexed it with IMR-4198, 6.0 grains of that behind 48.0 grains of WC-860 (100% loading density) with 405 grain castings in the 45-70, prompted by Fed 215 primers. This load gives 1873-level ballistics (about 1300 FPS), fine accuracy, and very little unburned powder in the bore. In contrast, the same boolit sent forth with 54.0 grains of WC-860 alone gives just over 1000 FPS, OK accuracy, and a LOT of unburned powder granules.

WC-860's principal advantage was its cost--$24.00/8# jug at the time I first bought it (2002). I have an older Hodgdon Manual around here someplace, and IIRC it lists a LOT of data for H-870 and possibly H-570 as well.

[Three44s]

I checked my copy of Hornady's First manual (circa 1967) and found different loads for H570 and 5010.

There is enough difference in charge rates to cause concern.

They are not the same in my opinion.

TDC,

List what calibers you load for and I'll check if there is dope for them with H570 in my old book. (I've got a partial of it myself and have never used it).

Three 44s

[9.3X62AL]

WC-860 and IMR-5010 were originated as powders for the 50 BMG, WC-872 was originated for the 20mm cannon round.

In loading data for the 50 BMG, powder weights for WC-860 and IMR-5010 are identical in a given loading.

[TDC]

Thanks 9.3X62AL and Three44s

Hmmmmm again!!.... You guys have really got me curious now!! I got so curious I crawled up in my attic, moved a bunch of old dusty boxes around I haven't seen in many years. Dug out an old Hodgdon Data Manual 21 (Circa 1970) and a Hodgdon's Basic Data #22 (they were in the bottom box of course). Loads are shown for H870 in calibers from 22-250 through the 300 Win Mag.... all with heavier boolits in their respective calibers. Very little info or application data for the H570.

Interestingly, H870 is the only powder in the manual that doesn't show any starting loads. When both powders were listed for the same caliber I noticed there is also a substantial difference in the max powder charges and pressures between 570 and 870.

As I mentioned earlier, I only have a few pounds of both powders and both are now discontinued. I'll probably use them up with some cast .338 220gr Lee GCs then switch to something else unless someone local has a use for them.

Thanks for all the info! I learn something new here every day. The concept of a duplex loading is new to me and something I'm going to have to try.

Thanks again, guys!!

TDC

[Ricochet]

I checked my copy of Hornady's First manual (circa 1967) and found different loads for H570 and 5010.

There is enough difference in charge rates to cause concern.

They are not the same in my opinion.
Are you sure you found data for 5010? That's a military .50 BMG powder that to my knowledge was never sold to the public till the military surplused it. I've never seen it in any old manuals.

[Three44s]

Ricochet,

Yes, my first printing Hornady manual (1967) has a few loads for 5010 ....... no plethora but a few.

Many more loads are for H570.

Let me know if it can be of use to you or anyone else.

Regards

Three 44s

[Ricochet]

Thanks for that! My first Hornady book's a 2nd edition.

Wonder what the original source of 570 was, then? Hodgdon was still mostly using surplus powder sources then. Perhaps an off-spec batch of 5010?

[Three44s]

Actually, the charges are enough different that I am thinking different powder ...... about 3 grs in a magnum case difference.

Note on the 5010 data:

What I have is only for .264 win mag and some of the .300 magnums and not even all of them.

No standard cases listed

And as such, all of the ones listed ...... few as they are .......... are with HEAVY for caliber J-word slugs.

Regards

Three 44s

[BerdanIII]

H570 Data

From: Hornady Handbook, 1979

.264 Winchester Magnum - Win. case, Rem. 9 ½ primer
140-gr. Spire Point - 71.3 to 76.0 grs. - 2900 to 3100 fps
160-gr. Round Nose - 66.1 to 71.7 - 2500 to 2800

7mm Remington Magnum - Peters case, Fed. 215 primer
175-gr. Spire Point - 71.6 to 76.6 - 2600 to 2800

.300 H&H Magnum - Win. case, Win 120 primer
220-gr. Round Nose - 68.0 to 78.0 - 2300 to 2600

"Cast Bullet Loads for Hodgdon Powders" - Lyman manual, date unk.

.30-'06
Lyman 311413 - 56.0 grs. - H570 - 2092 fps
Lyman 311284 - 56.0 - H570 - 2018

H570 Data

From: Speer #6, 1964

.257 Roberts Ackley Improved - Remington case, Rem. 9 ½ primer
100-gr. Speer 257-100-6-SP - 56.0 to 60.0 - 2705 to 2934 fps
120-gr. Speer 257-120-10-SP - 56.0 to 60.0 - 2699 to 2865

.25-06 Remington - Arsenal case (reformed .30-'06?) - CCI 200 primer
100-gr. Speer 257-100-6-SP - 59.0 to 63.0 - 3035 to 3253 fps
120-gr. Speer 257-120-10-SP - 59.0 to 63.0 - 2924 to 3113 fps

.257 Weatherby Magnum - Western cases, CCI 200 primer
100-gr. Speer 257-100-6-SP - 75.0 to 79.0 - 3132 to 3322 fps
120-gr. Speer 257-120-10-SP - 74.0 to 78.0 - 3034 to 3222

6.5x.257 Roberts - Remington case, Rem. 9 ½ primer
140-gr. Speer 263-140-10-SP - 53.0 to 57.0 - 2290 to 2492 fps

6.5x55mm Swedish Mauser - Norma cases, CCI 200 primer
140-gr. Speer 263-140-10-SP - 52.0 to 56.0 - 2315 to 2513 fps

.264 Winchester Magnum - Winchester case, CCI 200 primer
120-gr. Speer 263-120-6-SP - 75.0 to 79.0 - 3275 to 3457 fps
140-gr. Speer 263-140-10-SP - 71.0 to 75.0 - 3194 to 3313

.270 WCF - Remington case, CCI 200 primer
150-gr. Speer 277-150-6-SP - 61.0 to 65.0 - 2672 to 2820 fps
170-gr. Speer 277-170-GP-SP - 61.0 to 65.0 - 2612 to 2793

.270 Weatherby Magnum - Remington case, CCI 200 primer
130-gr. Speer 277-130-6-SP - 79.0 to 83.0 - 3175 to 3318 fps
150-gr. Speer 277-150-6-SP - 79.0 to 83.0 - 3106 to 3258
170-gr. Speer 277-170-GP-SP - 75.0 to 79.0 - 2882 to 3056

.280 Remington, 7mm-06, 7x64mm - Remington case, CCI 200 primer
145-gr. Speer 284-145-6-SP - 59.0 to 63.0 - 2540 to 2683 fps
59.0 grs. MAXIMUM for Model 760, 740 rifles
160-gr. Speer 284-160-10-SP - 59.0 to 63.0 - 2597 to 2761
59.0 grs. MAXIMUM for Model 760, 740 rifles

7x61 Sharpe & Hart - Norma case, CCI 200 primer
145-gr. Speer 284-145-6-SP - 73.0 to 77.0 - 2862 to 3055 fps
160-gr. Speer 284-160-10-SP - 73.0 to 77.0 - 2833 to 3034

7mm Remington Magnum - Remington case, CCI 250 primer
130-gr. Speer 284-130-6-SP - 79.0 to 83.0 - 3024 to 3191 fps
145-gr. Speer 284-145-6-SP - 79.0 to 83.0 - 2974 to 3156
160-gr. Speer 284-160-6-SP - 79.0 to 83.0 - 2962 to 3113

7mm Weatherby Magnum - Western case, CCI 200 primer
130-gr. Speer 284-130-6-SP - 80.0 to 84.0 - 3034 to 3189 fps
145-gr. Speer 284-145-6-SP - 78.0 to 82.0 - 2943 to 3080
160-gr. Speer 284-160-6-SP - 78.0 to 82.0 - 2916 to 3060

.300 H&H Magnum - Western case, CCI 200 primer
180-gr. Speer 3085-180-6-SP - 79.0 to 83.0 - 2783 to 2939 fps
200-gr. Speer 3085-200-6-SP - 75.0 to 79.0 - 2614 to 2729

.308 Norma Magnum - Norma case, CCI 200 primer
200-gr. Speer 3085-200-6-SP - 81.0 to 85.0 - 2680 to 2853 fps

.300 Weatherby Magnum - Remington case, Rem. 9 ½ primer
180-gr. Speer 3085-180-6-SP - 92.0 to 98.0 - 2969 to 3121 fps
180-gr. Speer 3085-180-6-SP - 89.0 to 95.0 - 2833 to 3027

.338 Winchester Magnum - Western case, CCI 200 primer
275-gr. Speer 338-275-55-SP - 79.0 to 85.0 - 2390 to 2629 fps

I have H870 data from Hornady 1979 and Hodgdon #26 if you want it.

[BerdanIII]

Aw, what the heck....

H870 Data

From: Hornady Handbook, 1979

.264 Winchester Magnum - Win. case, Rem. 9 ½ primer
140-gr. Spire Point - 70.6 to 78.3 grs. - 2900 to 3200 fps
160-gr. Round Nose - 66.5 to 72.8 - 2600 to 2900

7mm Remington Magnum - Peters case, Fed. 215 primer
175-gr. Spire Point - 71.2 to 80.0 - 2600 to 2900

.300 H&H Magnum - Win. case, Win 120 primer
220-gr. Round Nose - 69.3 to 80.0 - 2300 to 2700

.308 Norma Magnum - Norma case, Win. 120 primer
220-gr. Round Nose - 75.8 to 81.2 - 2400 to 2600

.300 Winchester Magnum - Win. case, CCI 250 primer
220-gr. Round Nose - 77.5 to 82.9 - 2400 to 2600

From: Hodgdon #26, 1994:

H870 Data

.220 Swift - 60 to 64 gr. bullet - 49.0 grs - 3035 fps - 36000 CUP

.243 WCF
105-gr. bullet - 52.0 grs. - 2788 fps - 38800 CUP
115 to 117-gr. bullet - 45.0 to 48.0 - 41400 to 47100

.244 or 6mm Remington
115 to 117-gr. bullet - 46.0 to 49.0 - 2589 to 2724 - 40900 to 47400 CUP

6mm-284
85-gr. bullet - 60.0 - 3281 - 40800 CUP
90-gr. bullet - 60.0 - 3249 - 41400
100-gr. bullet - 59.0 - 3174 - 42400
105-gr. bullet - 58.0 - 3147 - 45900
115 to 117-gr. bullet - 54.0 to 56.0 - 2788 to 2932 - 40400 to 47400 CUP

.240 Weatherby Magnum - 115 to 117-gr. bullet - 55.0 - 2880 - no pressure given

.25-06 Remington
87 to 90-gr. bullet - 60.0 to 65.0 - 2927 to 3230 - 38400 to 43900 CUP
100-gr. bullet - 60.0 to 65.0 - 2888 to 3235 - 39000 to 46800
117-gr. bullet - 59.0 to 64.0 - 2752 to 3032 - 34800 to 44400
120-gr. bullet - 59.0 to 64.0 - 2794 to 3024 - 38400 to 48000
125-gr. bullet - 58.0 to 64.0 - 2737 to 3020 - 40400 to 50300

.257 Weatherby Magnum
75-gr. bullet - 75.5 to 82.0 - 3159 to 3658 - 30000 to 48200 CUP
87 to 90-gr. bullet - 75.5 to 82.0 - 3133 to 3640 - 34200 to 48900
100-gr. bullet - 73.5 to 80.0 - 2927 to 3463 - 33600 to 53000
117-gr. bullet - 70.0 to 76.0 - 2755 to 3336 - 31800 to 53600
120-gr. bullet - 69.0 to 76.0 - 2788 to 3240 - 35400 to 53200
125-gr. bullet - 67.0 to 74.0 - 2640 to 3139 - 40100 to 52400

.264 Winchester Magnum
77-gr. bullet - 80.0 - 3568 - 43900 CUP
87-gr. bullet - 80.0 - 3557 - 46800
100-gr. bullet - 78.0 - 3325 - 44800
120-gr. bullet - 76.0 - 3389 - 53300
129-gr. bullet - 76.0 - 3170 - 49100
140-gr. bullet - 73.0 - 3163 - 54200
160-gr. bullet - 68.0 - 2868 - 51300
165-gr. bullet - 63.0 to 66.0 - 2630 to 2809 - 41600 to 51000

.270 WCF
130-gr. bullet - 65.0 - 2840 - 43900 CUP
140-gr. bullet - 64.0 - 2792 - 43400
150-gr. bullet - 63.0 - 2769 - 43200
160-gr. bullet - 62.0 - 2660 - 42800
180-gr. bullet - 60.0 to 62.0 - 2449 to 2543 - 41000 to 45000

.270 Weatherby Magnum
110-gr. bullet - 81.0 - 3200 - no pressure given
130-gr. bullet - 80.0 - 3214
140-gr. bullet - 79.0 - 2890
150-gr. bullet - 79.0 - 2943
160-gr. bullet - 78.0 - 2899
180-gr. bullet - 72.0 to 76.0 - 2673 to 2808

.280 Remington or 7mm Remington Express
115 to 120-gr. bullet - 63.0 to 65.0 - 2690 to 2744 - 42500 to 46000 CUP
125 to 130-gr. bullet - 63.0 to 65.0 - 2678 to 2709 - 45500 to 47000
139 to 140-gr. bullet - 62.0 to 65.0 - 2659 to 2720 - 46000 to 48000
145 to 150-gr. bullet - 57.0 to 61.0 - 2440 to 2568 - 42500 to 46500
154 to 162-gr. bullet - 57.0 to 61.0 - 2376 to 2543 - 43000 to 46000
168-gr. bullet - 57.0 to 61.0 - 2415 to 2588 - 44000 to 46500
175-gr. bullet - 57.0 to 61.0 - 2403 to 2538 - 45500 to 48000
195-gr. bullet - 55.0 to 58.0 - 2233 to 2419 - 42500 to 46500

.284 WCF
154 to 162-gr. bullet - 63.0 - 2560 - no pressure given
175-gr. bullet - 63.0 - 2528
195-gr. bullet - 59.0 to 61.0 - 2240 to 2320

7mm Remington Magnum
139 to 140-gr. bullet - 79.0 - 3153 - 46800 CUP
145 to 150-gr. bullet - 79.0 - 3080 - 51700
154 to 162-gr. bullet - 79.0 - 3099 - 49700
168-gr. bullet - 77.0 - 2963 - 49300
175-gr. bullet - 77.0 - 2918 - 48600
195-gr. bullet - 67.0 to 72.0 - 2509 to 2719 - 46600 to 53100

7mm Weatherby Magnum
100-gr. bullet - 82.0 - 3151 - no pressure given
115 to 120-gr. bullet - 82.0 - 3085
125 to 130-gr. bullet - 82.0 - 3230
139 to 140-gr. bullet - 81.0 - 3037
145 to 150-gr bullet - 81.0 - 3008
154 to 162-gr. bullet - 80.0 - 2952
168-gr. bullet - 80.0 - 3030
175-gr. bullet - 79.0 - 2929
195-gr. bullet - 70.0 to 75.0 - 2551 to 2770

7mm Shooting Times Westerner
160-gr. bullet - 83.0 to 87.0 - 3065 to 3233 - no pressure given
175-gr. bullet - 81.0 to 85.0 - 2926 to 3078

.30-'06 or .30/.284
180-gr. bullet - 64.0 - 2424 - 36600 CUP
190-gr. bullet - 64.0 - 2419 - 39600
200-gr. bullet - 64.0 - 2401 - 41200
220 to 225-gr. bullet - 63.0 - 2348 - 42300
250-gr. bullet - 59.0 to 61.0 - 2004 to 2117 - 38200 to 44700

.300 H&H Magnum
200-gr. bullet - 83.0 - 2779 - no pressure given
220 to 225-gr. bullet - 82.0 - 2706
250-gr. bullet - 75.0 to 79.0 - 2456 to 2616

.308 Norma Magnum
110-gr. bullet - 85.0 - 3058 - 35400 CUP
125 to 130-gr. bullet - 85.0 - 2968 - 33600
150-gr. bullet - 84.0 - 2953 - 39500
165 to 168-gr. bullet - 84.0 - 2917 - 38900
180-gr. bullet - 82.0 - 2835 - 40900
200-gr. bullet - 79.0 - 2702 - 41200
220 to 225-gr. bullet - 78.0 - 2614 - 44000

.300 Winchester Magnum
150-gr. bullet - 82.0 to 87.0 - 45500 to 48200 CUP
165-gr. bullet - 82.0 to 87.0 - 45500 to 51200
180-gr. bullet - 81.0 to 86.0 - 2841 to 2982 - 46400 to 53000
190-gr. bullet - 80.0 to 85.0 - 2788 to 2924 - 47000 to 52400
200-gr. bullet - 79.0 to 84.0 - 2691 to 2897 - 46600 to 52100
220 to 225-gr. bullet - 78.0 to 83.0 - 2520 to 2777 - 48000 to 51600
250-gr. bullet - 78.0 to 81.0 - 2489 to 2656 - 46000 to 52600

.300 Weatherby Magnum
180-gr. bullet - 92.0 - 2949 - 47100 CUP
190-gr. bullet - 92.0 - 3040 - 49400
200-gr. bullet - 92.0 - 3094 - 50300
220 to 225-gr. bullet - 92.0 - 3008 - 52600
250-gr. bullet - 84.0 to 88.0 - 2562 to 2704 - 44700 to 52600

8mm Remington Magnum
150-gr. bullet - 90.0 to 93.0 - 2965 to 3029 - no pressure given
170 to 175-gr. bullet - 89.0 to 92.0 - 2881 to 2967
180 to 185-gr. bullet - 88.0 to 91.0 - 2795 to 2939
200-gr. bullet - 87.0 to 90.0 - 2780 to 2914
220 to 225-gr. bullet - 87.0 to 90.0 - 2730 to 2856
250-gr. bullet - 84.0 to 86.0 - 2651 to 2764

.338 Winchester Magnum
275-gr. bullet - 74.0 to 79.0 - 2261 to 2416 - 38200 to 43000
300-gr. bullet - 72.0 to 77.0 - 2104 to 2308 - 34700 to 42500

.340 Weatherby Magnum
250-gr. bullet - 92.0 - 2524 - no pressure given
275-gr. bullet - 90.0 - 2594
300-gr. bullet - 88.0 - 2474

.378 Weatherby Magnum
300-gr. bullet - 120.0 - 2620 - no pressure given
350-gr. bullet - 110.0 - 2480

.470 Nitro Express
500-gr. bullet - 120.0 to 127.0 - 1828 to 1961 - no pressure given

.50 Browning Machine Gun
647-gr. bullet - 210.0 to 225.0 - 2789 to 2980 - no pressure given

[45nut]

H870 is what I use in the 500 A Square, 110grs under a 500.
Well,, I used it until I ran out and had to switch to 4350 but I wish I could get more. Whatever you do don't toss it out.

[TCLouis]

How does AA 8700 compare to H870?

[Ricochet]

In the .300 Weatherby loads I've looked up in manuals, 8700 appears to be a bit slower than 870.

[TDC]

Berdan III.... Now that's what I call - details!! Geesh... I had no idea there were so many applications for either powder.

45nut.... Do you have any current powders you'd be interested in trading that you don't have a use for? If so, we may live close enough to avoid the Hasmat fees and make a FTF sometime in the future if you could use it. I'm in no hurry... Let me know...

Thanks guys for the comments and input... This turned out to be an interesting thread for me..

Terry

[Hardcast416taylor]

I say I got 3 or 4 lbs. free because it was limited to 1 lb. per household with 3 inner seals and a small shipping fee. I had my neighbors order the other amounts of it for me. It was an ad carried in gun rags about the powder promotion back in the `70`s I believe. Robert

[BIG GUN]

I have used TCCI 870 in the 300 Win mag & 460 Weatherby improved. Just fill the case to the neck & seat a heavy boolit on it. No pressure, but left a hard to clean fouling in the bore.

[StarMetal]

Look at this burn rate chart:

http://home.hiwaay.net/~stargate/powder/powder.htm

According to it H570 is faster then H870 and 8700

Joe

[TDC]

I have used TCCI 870 in the 300 Win mag & 460 Weatherby improved. Just fill the case to the neck & seat a heavy boolit on it. No pressure, but left a hard to clean fouling in the bore.

I think bore fouling was a major problem with these powders and I recall that being a problem with cast .338 boolits.


Look at this burn rate chart:

http://home.hiwaay.net/~stargate/powder/powder.htm

According to it H570 is faster then H870 and 8700

Joe

Thanks for the chart.... I was really surprised to see RL22 had almost the same burn rate as H870 in this chart. RL22 is supposed to be the same exact powder as Norma MRP. I had requested info in a currently appearing MRP thread and got that comparison opinion on RL22. Very interesting!!

From my experience, MRP and H870 have such differing physical characteristics. Loads with H870 were always compressed and MRP were not. MRP granules are about 1/2 the size of 870 (and about 1/3 the size of H570). H570 granules are huge... about the size of mouse turds (maybe they are!!). MRP was clean burning and 870 was very dirty. Just goes to show us how radically different appearing powders can achieve close to the same end result.

In any case, both 570 and 870 are no longer being produced so I guess determining its usefulness today is a moot point. But it's interesting the information that has emerged....

Terry

[StarMetal]

Terry,

Don't take the chart for verbatim. Each different chart I look at rates differently. That just happen to be a chart that some of the military powders are on. They give you an idea though. When working off a chart, with no loading data, start low using a load of the next closest powder to it on the chart....beware if it's a very slow powder that requires full charges.

Joe

[anaximander]

Load data for both of these powders abounds on the net. If you can't find what you want there, look for old loading manuals at used bookstores.

Both these powders are slow burning, meant for heavy bullets in overbore magnums, like the .264WM or 7mmRM, and they work very well for them, but other applications exist as cited in a previous post here.

I wouldn't consider using either of these for cast bullets. Like almost all slow burning powders, both of these are only safe when used at high loading densities, like 90% or more. If you do that, velocities will be too high for cast bullets in most popular rifle calibers. If you load at too low a loading density, you risk a secondary explosion that would ruin your rifle and possibly injure you severely.

Maybe you can figure out some loads for smaller capacity cases like 32-20 or something, but why bother? There are plenty of well researched cast bullet loads for those rounds out there that are predictable and work very well.

If you try working up duplex loads using these powders, the only head you lose will be your own.

Just use the powders as they were intended. Life will go much better that way.

[Roberoo]

Hello,
I still have 3 lbs of H-870 in the orig. canister unopened. I used it on my 7 mmmag and it shot fine with a low CUP--- BUT that stuff is dirty ... the shells would get burnt powder all over the upper half, and the barrel looked like a milkshake straw with milkshake in it... I quit using it about 30 years ago and instead used H1000 and now I use RL 22. There is some data on H870 in the # 3 Nosler Reloading Manual for the 7 mag and 160gr partition and the 162 gr Spitzer Solid Base 79.5 gr of H 870 for both bullet weights.. (pg. 206) . I used Fed 215's and at the time they were the hottest on the market. Perhaps someone has had better luck than I. There is some data on the 300 Wby. and others in that manual. As has been mentioned, it appears this powder is for big cases with heavy bullets. I had to clean my brass every shot and the barrel after shooting (that is normal) but the amount of black soot was alarming. -- 4 legs in the air---