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Thanks again for the replies. Even found out about donuting. Not heard that one before.

Many thanks for that. I've got just such a round. Since they have discontinued my projectile (Hornady 100gn) I'm going to have to start over again. Probably opt for the Hornady BTSP. Thanks again

It was saying that you need a minimum of projectile bearing surface on the neck of the case to ensure nothing works lose.
https://www.youtube.com/watch?v=qkzh4_hyNqc&t=5s
At 7.30 in.

Hi there.
Just watched a video where it was stated (A cardinal rule, though not always achievable. Go figure which is it!) that a projectile should be seated so that it's bearing surface is a...