I have in the past covered the case mouth and tapped the case on the wood bench top. But the tumbler trick should help. I have never been comfortable with the compressed charges. I'm not actually chasing velocity just using a middle of the road charge. Halfway between the high and low charge is my own self imposed max charge. Example, if the start charge is 40 and the max charge is 44 then MY max is 42 gr. Just saying. That way I am closer to safe and sometimes the start load is quite accurate and my go to for that bullet. I have some medium bores. The 376 is my largest medium bore right now. I have an FN that is in line to get 400 whelenized in a bit. Thanks for all the advice. Be Well, Rustyzipper.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy. Its inherent virtue is the equal sharing of misery. Winston Churchill.