Well That didn't work....

[twotrees]

Finally got to range test my 7MM Mauser with 140 Lovern cast GC boolits. I tried some IMR 4320 Powder and the best it got was 2 inches at 100. Going to look at some 4895 and some 4831. The low end stuff shoots fine, but would like to take this boolit hog hunting and more Vel is needed.

I'll step back to the traditional 4198 etc, if I have to, but I had High hopes for this bullet at 2200 maybe a bit more.:violin:

Any thoughts??

Sized .287 bore on my #1 is .285 .

[canyon-ghost]

5744 is supposed to be a good powder for 7mm, although it's a little hard to find. It's one of the more fast-burning powders.

[rhead]

"Well that didn't work quite like I planned it." is a phrase that rolls of my lips with a certain familiar rhythm.:-D Slower powders often give better results with cast at hunting type velocities. Good Luck.

[Calamity Jake]

Finally got to range test my 7MM Mauser with 140 Lovern cast GC boolits. I tried some IMR 4320 Powder and the best it got was 2 inches at 100. Going to look at some 4895 and some 4831. The low end stuff shoots fine, but would like to take this boolit hog hunting and more Vel is needed.

I'll step back to the traditional 4198 etc, if I have to, but I had High hopes for this bullet at 2200 maybe a bit more.:violin:

Any thoughts??

Sized .287 bore on my #1 is .285 .


So what is wrong with 2" @ 100!!!!:veryconfu What's the volisity of your 4320 load?

That ain't half bad in my books. Try the 4895 and add a dacron filler.
You can also try a different lube, not lubing all the grooves and a different seating depth. Just make one change at a time so you will know what to do or not do the next time.

[mooman76]

So what is wrong with 2" @ 100!!!!:veryconfu What's the volisity of your 4320 load?

That ain't half bad in my books. Try the 4895 and add a dacron filler.
You can also try a different lube, not lubing all the grooves and a different seating depth. Just make one change at a time so you will know what to do or not do the next time.

I was kind of thinking that myself, especially for a first time out. Of coarse that is unless you have little tiny hogs the size of chipmunks there.:kidding:

[303Guy]

He's talking ground hogs!:mrgreen:

If'n't were me, I'd try a filler as the next step. Not Dacron but something that takes up case volume and forms a wad behind the boolit.

[MtGun44]

Boy, that is a tough standard. I'm happy with 2" at 100 with cast as a general rule. Exceed
it sometimes, not others. I'd think any hog you want will die if you shoot him with that
load.

Bill

[Bret4207]

So what is wrong with 2" @ 100!!!!:veryconfu What's the volisity of your 4320 load?

That ain't half bad in my books. Try the 4895 and add a dacron filler.
You can also try a different lube, not lubing all the grooves and a different seating depth. Just make one change at a time so you will know what to do or not do the next time.

I'm with Jake. If you can shoot 2" groups at 2200 all day long you have a keeper for hunting.

[twotrees]

The loads at LOWER Vel's were OK but as I went up, in powder charge toward 2200 FPS, they opened up.

I was using Speed Green (Bullshop) lube and too much, might have been some of the problem. The Bbl didn't have any lead but a lot of lube left in the bbl.

I guess I am picky because I have shot much tighter groups with both the 30-30 and my 30-06. Both of those were lubes with OLD Lyman "Black" lube. I don't have any of that left, and have been trying to find something that will sub for it. (over 6 different commercial lubes), and some home-made too.

2 Inches would be fine IF the Vel's were at the top end. But.........

I know Picky, picky, but that's how we get better, not accepting Average.

The rifle will shoot sub inch with condom's, but I am on a quest to find Cast loads for all my guns. That way I am not dependent on anyone, but me, for Boolits.

I tried the IMR 4320 because I had 3 Lbs of it and it is in the same burn range as 4895. (The Triplets 4895, 4320, 4064). I have 8 Lbs of Bulk from GiBrass that was suppose to be 4895 (-15%), but to date I have found it to be closer in burn rate to IMR 4198.

Isn't that part of the "game" we play, trying to find the BEST???

Thanks for all the reply's.

[runfiverun]

the dacron or other filler will help.
i ended up with 19-20 grs 2400 with both the 145 and 168 gr boolits.
or 25 grs 4895 and no filler in one rifle [145] and filler in the other two. one liked the nei 150 and the other the rcbs 168 gr.
try pistol and rifle primers also.
4831 did okay to 50 yds, but in the long run a much slower powder should be ideal.

[Bass Ackward]

There are some things to keep in mind when you start up the velocity ladder. Your bullet generates friction, but not the same kind as with jacketed. Jacked vibration is high friction, high frequency, short oscillation. Lead is lower frequency, longer wave length.

That makes it harder to go from one lead accuracy node to another. Especially with lighter barreled, sporter rifles. Some fall right on it and make life easy. Most don't.

Altering lube or lube quantity can make a difference. Powder change makes the biggest adjustment. This will alter this slow pattern enough which is why you might try 4320 and miss, but RL15 which is essentially the same powder hits. It is also why recommending loads at HV seldom works for other people as your bore is unique in that it sings it's own frequency song.

Often the best way to alter patterns and to shorten the distance between these velocity nodes is to shorten the vibrating portion of the barrel. This is done through barrel bedding pressure or the lack of it depending on what is needed.

With jacketed, you tune the load to the gun. With lead you may not have the bullet strength to do that, so you must cheat and you bring the gun to the load. Similar to what the old BOSS system did. That 2 MOA might well adjust to 1 1/2" or slightly better. The heavier your barrel, the less this works obviously.

[Von Gruff]

I had the same aims for my own 7x57 but with the 160gn Lyman boolit.

I had sucess with 3031 in previous 7x57 but this one really likes H4350 and 39gn gets me 2415fps and 1 1/4 - 1 1/2 in at 100yds for 3 shot hunting accuracy out to 250 where I still have 1700fps.
Idid my workup with lino and softnosed the boolit for the same results after I found the load. Have taken game out to 185yds so far and with good kills.
This is the softnosed expansion at 100yds, with softnose being 65gn 50/50 ww/pb on lino base.

http://i667.photobucket.com/albums/vv39/VonGruff/006.jpg

http://i667.photobucket.com/albums/vv39/VonGruff/Goats-Castsoftnose006.jpg

Von Gruff.