Yooper,
I am only shooting a starting load with 130gr jacketed. I have gotten over 7 reloads in my now departed 7mmRM and they WERE hot. I hard a fella say a case WILL strech more with reduced loads than full power because of only the neck and shoulder making contact with the chamber, whereas a full power load will use the entire case and hold the case in place with min elongation. Seems logical, but not probable. I think brass is soft enough to expand at most psi levels seen in a 300WM. As far as the belt sticking, no not really. the whole case was catching on the extractor by alittle honing took care of that.
I have been fooling with Handi rifles nearly every weekend for the past year, and when this problem arose, it was only natural for me to "tinker" with it.
I have 1 TC barrel and 1 Bergara barrel. Like I said before everything looked great at first, fit, finish, and accuracy. I noticed the case streching and finally the loose lock up. I am still very pleased with the barrel, and probably would have it repaired, but my dealer is making me a deal that is hard to pass on. I for one really like the finish on the barrel. Matches the receiver very well.Pro Hunter.
Thanks,
Jerry