8x57 JRS loads

[NuJudge]

I bought a new set of barrels for my Valmet: 12 gauge over 8x57 JRS. The 8x57 JRS is a rimmed version of the rimless 8x57 JS cartridge, and it has the .323" groove diameter. It has a lower maximum operating pressure than the 8x57 JS.

I'm wondering if anybody has any cast loads that work in their combination gun or double rifle in 8x57 JR or JRS.

[shredder]

I bet the classic 13 grains of Red Dot over any boolit from 150 grains and up will work. I understand that doubles and combination guns can be fussy about regulation but I would try that load for sure. Personally I have had good luck with my 180 grain Lee RN with 13 gr Red Dot. I also shoot the 8mm Karabiner boolit at 237 grains with 32 grains of H4895 held in place with 2.2cc of puf lon. It is a very accurate load and it's flat nose should make it a formidable killer if you are looking to hunt with your rifle as well.

[eck0313]

I've had good results with 20.5gr of IMR 4198 with a 200 gr. cast bullet in my drilling, and shot to the sights at 50 yds.

[TCLouis]

21.5 grains of Milsurp 4759 and the 175 grain GB boolit worked well for me.
1685 fps according tomy PACT.