Myself and a buddy chipped in together and bought a Hornady progressive press and have been loading for awhile now. The only problem we' ve run into is with the 300 Win Mag loads. We can only get them to go into the rifle properly if we use Hornady brass.

With any other brass we use, they won' t allow the bolt to close. We' ve measured overall length, case length, shoulder, case diameter from mouth to belt, wall thickness, everything!!! But we cannot find the problem. We' ve tried Winchester, Federal, and Remington brass. Dimensional wise, they are the same as the Hornady when we' re done trimming and sizing.

I might note, the loads with the hornady brass are tack drivers.

We' ve loaded .270, 30-06, and .45 acp rounds with no problems.

Any ideas?