Thanks for the replies. I've been away for a while between work and deer season. And with a recent cold spell I haven't been to keen on heading to the range. I am loading my hornet rounds to 1.77" with the Sierra 45 gr, which has a pretty short, round ogive.
Haven't had any issues with loose primer pockets yet, but I am trimming my brass about every other firing. I neck size with a Lee collet die rather than full-length resizing. I've always heard that hornet brass stretches a lot but this is my only hornet, so I don't know if that is typical (?).
I typical shoot 5 shoot strings without waiting for the barrel to cool between shots. I've never noticed that it gets abnormally hot, but I'll pay more attention next time I have it out. Of course it will probably be several months before I can shoot in temperatures above 30°F.

Frosty