I'm having a 7x57 built this spring. It will be a lightweight carry rifle intended for use on deer and elk. I already have dies, a supply of 150 grain Nosler Accubonds, and various powders on hand.

Question 1: Which of these powders, or other suggestions, work well with a 150 gr bullet? IMR 4350, RL15 , IMR4895, RL17, Staball 6.5

Question 2: Haven't found any brass yet. I'm going to have the rifle marked 275 Rigby. Are Hornday and Quality Cartridge the only ones that manufacture the 275 brass?

Question 3: Is Privi Partisan brass good?

Thank you

Forgot to add it will have a 22" barrel.

50.5 grains H4350, 2864 fps. 56.4 KPSI.

With 150 grain Nosler BT mine gave good results with:
49 gn IMR4451 at 2745 fps
54 gn Reloder 26 at 2838 fps
52 gn StaBall 6.5 at 2825 fps
22" barrel, 210 primers, 3.100" OL
Chamber throat length can vary all over the place with individual rifles and pressure along with it.
I used 7-08 data and watched the chronograph.

Thanks guys.


Any opinions on Privi brass?

I've used it in several cartridges including 7x57. It's not premium brass, but I'd say it is at least as good as Federal, Remington or Winchester.

Thanks for the information. I mostly use Remington and Winchester for my other rifles. It seems to be about the only stuff available right now

Denton, did you happen to test with IMR4350 during this load development?

In a 21" 1:10 twist I make 2813 fps or so with 49 IMR 4350 and Nosler 150 BT. Remington brass, Remington 9 1/2 primer.

Didn't happen to test that alternative.

The 7x57 is a favorite of mine. Because chamber/throat dimensions vary so much with the round I don't recommend specific load data. If you have a good chronograph, with the 150-grain bullet and IMR4350 start at 42grains or so adding powder until you get to 2750fps-2800fps and stop. Then play with seating depth etc. for accuracy.

Solid advice super-T
Thanks

I don't know if you've looked at this, but there is some pretty good information here, as well as what you've already received. There are also a lot of other threads dealing with the 7x57 as well. It must be a lot more popular than the gunmakers and ammo companies realize as it's one of the most consistently discussed cartridge on the entire 'fire.

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/4019389/1

If the above loads don't work out, I see it's not on your list, hefty loads of 760/H414 has solved a lot of problems in a variety of rifles with 150-160 gr.

I have used Privi brass for the 7x57 and been well satisfied. Well finished, consistent weight and length. Also ordered some in .270 Win. and I was not nearly as impressed, almost like it came from a different source.

I have run Rl17 with the 150 gr. Nosler Partitions to 2800+ FPS with good accuracy. 48.0 gr. did the trick in a Winchester M70 Featherweight an clost to that in a Ruger #1A. I do strongly suggest starting at least two grains below that as I could not come anywhere near that load in a custom FN commercial Mauser action that has a very tight chamber. IIRC, 46.5 was as high as I could go in that rifle. Average accuracy in the two rifles was .75" and one inch so far in the Mauser.
FWIW, I've been working with 7-08 loading data as my three rifles are all on modern actions.
Paul B.

Thanks for the information fellas. Some good starting points, now just to wait for my rifle.
I did order a couple bags of Privi brass, Powder Valley has the lowest prices I could find.

RevMike I have looked through that, thanks

My #1 in 7x57 likes Nosler 150s with RL17

49 grains of IMR-4350 produces 2717 fps with a 150 Nosler Partition from my shortened FN military barrel of 22". Not blistering speed perhaps but, will exit an elk, and I like to take it easy with my old M.98.