Not chambering!!

[PA_Allen]

OOB:


I always chamber a couple of pieces of brass after sizing just to make sure it cycles. This includes fired brass, bolt rifles, etc. It takes a few seconds and is a good check to make sure nothing has changed.

LR1955

LR1955's advice is sound. For the AR platform, I always chamber a couple pieces of resized brass before loading a bunch. Brass work hardens as it is plastically deformed from firing and resizing. Even if your die is set up to perfectly set back the shoulder today, it may not work on the same brass a couple of firings from now. Many times I have had to slightly screw in my die farther to continue to get 0.003" shoulder set back as the brass work hardened over multiple firings. For the Grendel, my die setting is different for Lapua and Hornady brass due to the different strengths of the brass. I "float" my sizing dies using an o-ring under the lock ring, and I put a reference mark on the die lock ring and the press. That way I can slightly adjust my resizing die setting without having to loosen the lock ring. Also the floating die helps with reducing run-out and misalignment.
Best,
PA