Thanks for the replies.

I can't remember the exact hunting ammo I was using, it was cheap 150gr stuff like you'd get at Walmart. I've heard to avoid heavy bullets with commercial powder.

I will clean it before I fire it again. I didn't have any extraction problems with the surplus ammo I shot first, but I didn't know if 50 more rounds worth of dirtiness might have been the problem with the hunting ammo. I've also been advised to pick up a USGI extractor, so I'll try to do that sometime. The only ones I found were at Fulton and they're sold out right now.