Thread: Brass issue?

Simply looks like an end of sizing mark to me.

If you're ever suspicious of pending separation, straighten out a paper clip then bend the last 3-4mm to a right angle after pointing it slightly. Feel down inside the case wall til you hit the bottom. A thinned portion will have increased friction and if it's very near separation, you'll feel a definite depression. Practice on new and old cases and you'll soon get the idea

3/4 turn is quite a lot

Yeah it is a lot, I mainly just did that to see what would happen to the ring. When reloading I set up as per instructions ie. Screw the die in until it contacts the shell holder then a further quarter turn before locking the die off. Will also try a factory unfired round as you stated.

Simply looks like an end of sizing mark to me.

Is that something to worry about as I think this may be the number one cause. I can just catch my finger nail over it.