Originally Posted by
GunnyMack
Crimp groove- good point! Thank you for that.
Was just making up a few dummies to function test, from mag to lifter to chamber works fine until the last 1/2" of bolt travel. Ok, I should have trimmed the case. Now the last 1/8" and hard closing. Hmm, take a couple thousandths off and still kinda tight but it closed. Huh, it should slide right into and close with a full length sized case.
I took out my stash of Remington bee ammo and pull the bullet, deprime and reseat the bullet and bingo ! Upon further inspection the Remington shoulder is shallower than the other cases I was using. Could it be a Mashburn chamber? No any case should feed into an improved chamber. I'm still waiting on a couple parts before I can shoot it.
Of course the Remington case neck split they are so old!