commander faschisto wrote:More great info...thanks again!....I've got several mag variations; will check for which one allows max OAL with reliable chambering. Gee, I almost feel like I'm learning something here...? The ballistics school of hard shooting!
Be mindful that even though you may have a longer COL magazine and that groove up the front of the mag well, you may lose that additional clearance as the cartridge passes from the lower to the upper receiver. I had to relieve a small amount of the upper receiver, actually make a short groove from the bottom of the upper receiver, up to the barrel extension to allow longer COL rounds to pass by. Now that was in my formerly owned 300 OSSM. I have not measured the clearance in the 450b. Shoot, I'll go do it right now BRB.
Hoot