Just wanting to know how many people use standard or magnum primers in there .375 reloads and why.

PC,
I use std primers, in small cases, and mag primers in big ones. If the pressure is still low, i fall back a few grains, and then try the mag primers.

also, big cases, and cold weather, always mag primers.

jeffe

Jeffo,

I read somewhere that mag primers are not conjusive to accuarcy is there any truth to that ??

I would use Fed 215M's

PC - When you are attempting to set off a large column of powder, .375's qualify, then you need a magnum primer. Magnum primers are questionable for cartridges like .25-06 or 6mm. In smaller cases, the explosive pressure caused by a magnum primer can create problems with accuracy. They create enough pressure to engage the bullet into the lands before the powder fully ignites.

Unless you just enjoy hang-fires or ignition problems, use magnum primers like all load books recommend.

Thanks zero & jeffo, fed 215m's it is.

The three large case calibres I have loaded the most for in bench style rifles have been the 300 Winchester, 358 STA and the 375 H&H.

The 358 STA was consistently better with Fed 215s.

300 Winchester mostly better with Fed 215s.

The 375 H&H mostly better with Fed 210s and Winchester standards.

Perhaps had I been doing that shooting in the US of A I may have had more magnum primer use in the 300 Win and 375 because of shooting in colder weather.

Mike

I've had better results with federal 215's than 210's in my .375. I was getting large velocity spreads and poor accuracy with 210's using RL15 and 260 gr partitions. When I switched to 215's with the same load the velocities got much more uniform and accuracy improved. My average velocities also went up about 30 fps, I don't know why.