I have an H&R Break action .308 that my younger brother uses. He and I both love it, although, after a few rounds of shooting the firing pin doesn't strike hard enough and it will misfire. We were double checking his scope last year before deer season and after about 10 rounds it would misfire every time. Is there anyway to tell what the issue is? We were using crappy ammo, so I grabbed a few reloaded rounds, and a box of some other stuff that was pretty good (can't remember what it was) and the same thing happened. ANy thoughts?