Thread: Case lengthening when bump sizing

Originally Posted by veitnamcam

If you have a large chamber then it is possible for the shoulder to move forward if "partially full length sizing"
As the case body is sized inward but the die isn't low enough yet to contact the shoulder it moves forward.
This can cause tight chambering on the shoulder...the solution is obviously to lower the die or change shell holder untill the shoulder is bumped back a couple of thou.

Anytime you squeeze a brass cylinder down in diameter without holding the top from growing it will grow lengthwise.

Totally agree on how as the body is sized the case lengthens .��

I'm trying to get a few of the doubters to watch the YouTube video I've listed in #26 .

@Micky Duck , has the video convinced you ? ��