Re: perplexing problem with berger 300's
Hmmmm, sounds like you may be shooting a RUM? RL-22 may be a bit fast for that bullet and cartridge???
The way I got mine to shoot exceptionally well is to seat the bullet shallow and and have to slam the bolt closed hard to get the bullet backed into the case enough for the bolt to close.
I honed the neck of the sizing die and don't use the plug to expand the neck after sizing half the neck. Its pretty weird but its the way she shoots the best. And it is good!
There is enough neck tension to extract a loaded round from the chamber but not from the rifle without releasing the bolt.
Just some experience to add to the pile.