You need a quicker powder that will burn nicely at lower pressure.   My loads in that caliber are 13-14 gr 4227, depending on bullet weight, which should run 160-180 gr.   I prefer LP primers. Look for a bullet that will just slip into a fired case.   Doesn’t hurt if they are quite a bit over groove diameter.

CHRIS

rgchristensen wrote on Nov 16^th, 2024 at 5:59pm:

My go to, match load is 13.0 gr 4227, with a 185 gr stop ring bullet.

I shoot 13-14 gr IMR4227 depending on which rifle I am shooting with a 170 gr stop ring bullet. My favorite rifle has a weak main spring so I use LP primers in it. The ASSRA targets seem to be the right thickness, so when seating the pistol primer, I let the primer cut out a paper shim. LP primers are about 10 thousands thinner than LR primers. All other rifles I use LR primers. I probably worry too much about the pistol primers moving back under pressure and hammering the block face, but then why take a chance when paper shims are so easy to make.
Mike

I corrected my previous reply (my memory of 50 years ago is my excuse). I checked my dusty records and came up with using good old Lyman 316475 with about 10.5 grains of 2400 or 17 grains of 3031 (don't know why I even tried that). More recently with Buffalo Arms stop ring bullets in DWM Berdan primed brass it was around 10.5 grains of H108 or around 14.3 grains of H4227. I really need to get back around to working some with the 8.15x46Rs but I get sidetracked by my 32-40.

A few years ago, when powder was very hard to come by, I bought 8lb of 300MP. I’ve been told it works good in the 8.15x46r. I’ve yet to try it.
Mike

Definitely, through many years and many rifles they have varied between .316 and .321.

I don't know as yet what my bore is. I am going to check and probably order a mold if I can't find any store bought.




JMH