Thread: Seating depth question

I don't adjust dies myself as I'm not a consistently good enough shooter to tell the difference, and I'm usually shooting fairly forgiving bullets with much more that 0.020" jump anyway.

I'm not entirely convinced by the theory either. Seems logical but perhaps oversimplified. Is the primer so strong that the inertia of the round is overcome and the whole thing moved forwards before the primer goes off? Maybe with a little 222 but what about a much heavier 300 win mag? What if you have very light neck tension, would the bullet stay put and the case move up around it?