Quote Originally Posted by loiner1965 View Post
reload for 6 calibres and never come across this issue.
i googled it and most say its a loose chamber so when sizing it pushes the brass down then the shoulder pushes it back up.....not technical am i lol
It's not as pronounced as I'm probably making out. I genuinely think it's down to the bass flow. You have to look inside the neck of the case, in good light, to see what I'm referring to.

It'd probably go unnoticed for most, but I'm a bit anal and want to keep shrinking my groups