84jim
Yep I did the dummy bullet thing and to touch the rifling I'd have to load out to 2.40" my max to use the magazine to load is 2.265"!! So I'm loading everything to 2.260"! I think I've nailed down the load for the 69 gr SEI HPBT today!
See the target below - still need to work on the 75gr Hornadays!
I'm also sure the trim to length of 1.760" is helping as well!!
My cases don't seem to grow as much doing this which in the long run should make them last longer!
Well I assume since the barrel is marked 5.56 NATO it is a 5.56 chamber?