H375 Powder

[smokemjoe]

I have some H375 Ball powder, I used this powder about 12 years ago in I think 222 and 30-06, , Does anyone know anything about it and is there any loading date. Thanks- Joe

[smokemjoe]

This is H375, Not H335, H380, H322, or any of the slower of the ball powder. I see I got this powder in 1975.

[felix]

Joe, I remember this powder by name only. Searching around for you I have found various applications for it. It boils down to something faster than H380 and slower than H322. Being that the powder is so old, assume some moisture is gone and the powder would be closer to H322. You can get a for sure feel when using a revolver, like one of your Rugers. The powder should go poof treating it like Unique. Load incrementally heaver in terms of grains by going from 357 through 44 mag with your nominal boolit weights. A full case full in the 45 colt case of RL7 or 680 with a 300 grainer and the powder should show promise. If it does, then you know you are in the ball park of a H322. That being the situation you can migrate to the 30-30 using nominal booits there. That would be my progression to discover the usefulness of what you have. ... felix

[smokemjoe]

Felix: I found one of my old loading notes from 1976, It says 50 grs. with a 180 gr. jacketed in 30-06. Also used it in 35 Whelan and in 358 Norma Mag. with 200 gr. jacketed. Just dont know what it would compares to. Thanks- Joe

[felix]

Compares to late issue BLC2/846, which are the military versions of 748. Late issue H335 is more like A2230/844. ... felix

[BerdanIII]

From Handbook for Shooters and Reloaders, P.O. Ackley:

"General Information - Surplus Powders"

"…Reduce first test load by 5% from highest shown. If air temperature is more than 20º above test temperature, reduce first test loads a second 5% (Note: Test temperature is not mentioned in book). Work back up in half-grain increments. If primers are loose or seat too easily on subsequent reloading of case, reduce charge about 4%…"

Note: This was written by Hodgdon, himself

Loading Data For Spherical H375

Caliber - Bullet (gr.) - Powder Charge (gr.) - Velocity (fps)

.222 Remington
50 - 27.0 - 3033
55 - 27.0 - 3004
.222 Magnum
50 - 31.0 - 3408
55 - 30.0 - 3363
55 - 32.0 - 3534
55 - 33.0 - 3677
.22-250
50 - 40.0 - 3872
55 - 37.0 - 3555
60 - 36.5 - 3494
.219 Wasp
51.5 - 32.0 - 3512
51.5 - 33.3 - 3802
55 - 33.0 - 3609
.220 Swift
50 - 41.0 - 3798
55 - 39.0 - 3519
60 - 37.0 - 3323
.243 Winchester
75 - 40.0 - 3107
90 - 37.5 - 2858
105 - 35.5 - 2650
.244 Remington
70 - 46.0 - 3714
75 - 44.0 - 3501
85 - 40.0 - 3064
90 - 39.0 - 2935
105 - 36.0 - 2666
.257 Roberts
87 - 44.5 - 3148
100 - 42.0 - 2925
117 - 40.0 - 2659
.270 Winchester
100 - 57.0 - 3564
130 - 51.0 - 3078
150 - 49.0 - 2848
170 - 47.0 - 2574
7 x 57mm Mauser
139 - 41.0 - 2566
160 - 38.0 - 2377
175 - 37.0 - 2239
.30-'06 Gov't.
150 - 55.0 - 2888
180 - 50.0 - 2559
.303 British
130 - 47.0 - 2686
150 - 45.0 - 2582
.35 Whelan
180 - 63.0 - 2766

From Handloader's Digest, 3rd Edition:

"Do not use the MAXIMUM loads listed until lower charges have been fired without any indication of excessive pressure. It is recommended that you start by reducing these loads by at least 10%."

"'Maximum', here, is taken to mean those pressures which allow reasonable reloading of brass, normal working of action, etc. It is not intended to indicate pressures just under the bursting point of the gun or case."

MAXIMUM RIFLE LOADS

Caliber - Bullet (gr.) - Powder Charge (gr.) - Velocity (fps)

.222 Remington
40 - 27.5 - 3584
45 - 27.0 - 3420
50 - 26.0 - 3303
55 - 24.5 - 3209
.243 Winchester
75 - 37.5 - 3513
90 - 35.5 - 3225
105 - 35.5 - 3070
.244 Remington
80 - 40.0 - 3532
Reduce 6% for 6mm Remington
.257 Roberts
120 - 40.0 - 2863
.30-30 Winchester
170 - 37.0 - 2280
.219 Wasp
50 - 33.3 - 3802
55 - 33.0 - 3609
Above Wasp loads are maximum velocity.

From Handloader's Digest First Ed.:

"Spherical H375: Probably the best powder for the .219 Don. Wasp. It gives good performance in larger cases up to .30-'06. 1-lb. can $2.50, 20-lb. keg, $45."

[georgewxxx]

Berdan look at both the 105grain 243 Winchester charges again. Better recheck your posted data...Geo

[BerdanIII]

I noticed that when I typed it up; those are the numbers from the sources. I will check them again, however. The data from Handloader's Digest was in the form of a very large table with many different powders listed; the same velocity was noted for varying charge weights of different powders and I'm more than a little suspicious of that coincidence. I would go with the Hodgdon data and lop 5 to 10% off the weights he noted. Then again, H375 was a surplus powder and you know different lots would have slightly different burn rates.

[BerdanIII]

The numbers in the thread are what was printed in the books.

[georgewxxx]

Berdan, I wasn't on your case about those conflicts. It looked like transposed data. Can't imagine being a proofreader for a living. I have on three occasions sent notices to major powder company's about wrong on-line data similar too that. Sometimes simple transposing of one number can get us into trouble. That's one reason to use two or three sources for loads if possible. It might be better to omit something that doesn't look right.

I shoot 100% cast loads for everything I have, but have a container of H375. On occasion I load condom stuff for friends and that's why I was going over your list. Thanks for giving me a few ideas where to use it. Once the can is used up, I doubt I'll ever replace it. ....Geo

[BerdanIII]

georgewxxx:

No offense taken. It's always better to be safe. A 10% decrease in charge weight for openers should put you in safe territory. For the .243 WCF, you never know when somebody is going to use reformed .30-'06 brass and load up some real hummers.

Glad I could help.