Posted 22 October 2006 - 02:53 PM
I think that you should use the 215s. The longer burn time is helpfull in igniteing large doses of slow burning powder. I use them in rifle rounds with cases smaller than your 300. I have a 25-06 that years ago I couldn't get to shoot worth a darn until my old reloading mentor told me to try 215 magnum primers due to the hard to ignite chracteristics of slow powders. Just like that my groups shrank. I also got better accuracy when I aplied a light crimp, I always figured that it was due to more uniform neck tension but your friends theory on the "splash back" off of the base of the bullet makes sence and may be the reason I got the improvement in accuracy with a crimp.
Sharps, the rifle that made the west safe for Winchester!
Real tractors have two cylinders and hand clutches.
My rifle is mine, it isn't for sale, and I only give guns to people that I really like.