Originally Posted by jsthntn247
Yes, all the brass was trimmed after resizing. I thought about getting a collet body die but still not sure if that will work or not. Factory new ammo cycles fine with no marks. This thing undoubtedly has a very tight chamber.
with the .300H&H case (parent case) a full length die does not size all the case body. You don't need a lee collet die, but you need the one that will size all the way down into the band at the base for starters.
* what kind of a chamber is in your rifle? Is it a standard chamber or a tight neck?
* if you have a couple of unsized rounds from your old chamber that have not been resized, check to see what the neck diameter is, and the overall length at the datum line to the base. The gunsmith may have head spaced it off the base to shoulder instead of the locating band to bolt face that is a Sammi spec, or vise versa. You cannot go by the shoulder to neck mateing point! Looks like you'd need something with an I.D. of about .403 (even 10mm will work) to measure your head space between cases. A Hornaday headspace gauge will serve your needs well or even a 10mm I.D. inner bearing race will work well. Looks like a 12 or 13mm length is about right. Then measure with a dial caliper and compair between the old and new cases.
*you could also remove the bolt and try to insert a sized case in the chamber. If it goes in all the way to just ahead of the seating band, then you need a better sizing die. But if it goes all the way in, then it's a headspace problem.
I'll get a link for the die manufacturer