Help for newbie with closing bolt issues

[Son]

I've never heard about the flex of the action causing the cases to break off at the neck... actually I've never heard of a neck being left behind from an extracted case either. I can only imagine where that theory may have came from. Can you please give us a reference so we might investigate?

On another tack, pull your bolt out and check to ensure the chamber is clear of obstructions. Make sure the head of the bolt is wound all the way in before putting it back in the receiver... another thing you might look at before putting it in, is that the extractor claw isn't seized or jammed in with crap in the spring, not allowing it to go over the rim of the case. Don't worry too much about any perceived differences in the metric and imperial sizings for the round.