I just loaded 10 139 Hornady flat bases & 10 140 Sierra flat bases with H4831, just screwed up but it's a safe load so I thought I'd try it. The manuel says about 2,650 fps rather than the 2,800 from imr 4350..

In my Ruger #1 7x57, I loaded IMR 4831 over Hornady 138 gr SP. The load would shoot under 1# and killed many deer.

I tried H4831sc with 140 gr. bullets but it didn't do too well. Your results may vary, of course.

I also tried several other powders. I have yet to settle on one but the H4350 and IMR4350 look promising. What looks best thus far, though, is the classic 7x57 powder, H414.

I'm still developing loads so nothing's settled yet.

I finally went with H414. Clean burning and the best velocities. H4831 should shoot alright and give mild pressures. The loading bench mistake is what should get the most attention.

quote:

Originally posted by tom ga hunter:
I just loaded 10 139 Hornady flat bases & 10 140 Sierra flat bases with H4831, just screwed up but it's a safe load so I thought I'd try it. The manuel says about 2,650 fps rather than the 2,800 from imr 4350..

In 1969, I killed my first moose ( a "typical" medium-size bull) with this same bullet and powder shot from a Brno ZKK 7x57.

Shot completely through him, twice, at a paced 180 steps...and I'm 6'-3" so my "measuring" steps are close to a yard each. Just took him maybe 15 seconds to realize he was dead. He never moved more than two feet in any direction.

Didn't NEED any more velocity, and more velocity might even have possibly been a mistake with that non-premium bullet.

I have used AA3100 with the 139 gr. hornady flat base. That has produced some of the best groups with my 7x57 and at low pressures. 3100 is between the two 4831's on the burn charts. I also like the 414 for higher velosity. Merg

quote:

Originally posted by tom ga hunter:
I just loaded 10 139 Hornady flat bases & 10 140 Sierra flat bases with H4831, just screwed up but it's a safe load so I thought I'd try it. The manuel says about 2,650 fps rather than the 2,800 from imr 4350..

No, but I have used MRP and RL22 with 175-grain bullets in the 7X57mm. You can't get enough of either powder into a 7X57mm case to give dangerous pressures with any bullet of 175-grains or less weight. H4831 is even more this way, as you casn't put nearly as much of it (the standard version at least) in a 7X57 case as you can of MRP or RL 22. Maybe if one used H4831 SC.....

The powder I've found that gives the best performance with 140-grain bullets in the 7X57mm is WW760/H414. Both can be loaded, in a strong modern rifle, to give a 140-grainer very close to 3000 FPS with exceptional accuracy.

Once again, the 7x57 and H414 fit together like my hand and a woman's C-Cup. The only thing running a close second is RL19 with most bullets. The first powder to load in one is H414 period.

I am with J Stevens.
I have used H-414 in two 7X57 with great results for 140 and 150 grain.
But One of the Rifles, A CZ fullstock shot 160gr bullets better with RL-19.
I am taking my #1A 7X57 after mule deer next week with a 140 grain Balistic tip over 50 grains of H-414. Sub MOA and 2877 fps.
...tj3006

I used it for years along with 4350 in the 7x57, until I tried H414..If you have a good modern rifle then you can go beyond most reloading manuals by a good deal as they are aware of the many soft actions around in that caliber...H-414 is the only powder for the 7x57 IMO....

I have not used H4831 in my 7x57 ,yet.!!
But I do use a lot of H4350 with 139-140 grain bullets in my mountain rifle. The chrony reads 2825 fps with Partition and Hornady.

i'm in the middle of load development for my cz m550 american in 7x57. one of powders i am trying is: IMR 4831 with these charges:


* 44 grns
* 45 grns
* 46 grns

weather has been inclement, but i intend to try these at the first opportunity and will be posting the results (click here). check it out if interested.

Tom Ga Hunter: I cannot vouch for the H4831. I can, however, vouch for H414. I use it with 160 grain Nosler Partitions and 162 grain Hornady SSTs. I chronographed my loads at 2,815 fps out of my CZ 550 American rifle in New Mexico when I lived there. It would print three slugs into less than a half inch at 100 yards too. My load was 48.3 grains and there was no problems with sticky bolt lift, cratered primers, blown primers or blown up rifles. . My brother uses H414 and 160 grain Nosler Partitions in his CZ 550 Full Stock and his friend uses H414 and 162 grain Hornady SSTs in his rifle, both at 48.3 grain levels. Both rifles are exceedingly accurate. I know this hasn't been any help but I felt compelled to put it here. Hope you find the load for which you search. Tom Purdom

Glad to see someone agrees with me. I haven't had less than three 7x57's in the last thirty years and has been my standard big game round when the game is elk size or smaller. I do like to carry the .338 better if hunting in grizzly country for some reason. It is a great round and will do a lot of killing with a 160 premium bullet at 2750-2800 fps. due to moderate velocity and great penetration.

quote:

Originally posted by merganser1:
I have used AA3100 with the 139 gr. hornady flat base. That has produced some of the best groups with my 7x57 and at low pressures. 3100 is between the two 4831's on the burn charts. I also like the 414 for higher velosity. Merg

Another testimonial for AA3100 (which also includes the 4831s as per Merganser's cite above) which will do anything you want in the 7X57 unless you're trying to max it out into a 280. I use it for both 139 gr Hornady SP and the 175 gr Hornady RN to duplicate or somewhat exceed the original velocities. Any more velocity is unnecessary for 95% + of your hunting applications. If you just have to squeeze out the extra fps for a flatter trajectory or more ft-lbs beyond 300-350 yards, go for it. I've just never seen the need to.....

IMR 4350 and R15 have worked great for me.

Put a long throat in your 7x57 and the loads mentioned here are mild indeed with H414..I can get 2916 with a 160 gr. bullet with H414 and a long throated rifle. I reloaded one of those cases 14 times with that load in one day and quit after 14, as the case had been trimmed 3 times and it just seemed like time to quit.

I would not recommend this with a soft Mauser action such as the 96 or some lesser 98s..My present action is a G33-40 small ring with a Lothar Walthar barrel..I have loaded for the 7x57 since I was about 13 years old as I recall. Jack O'Conner got me started on the 7x57 and the .270 just like he did legends of hunters.