I have a Buffalo Classic 38\55 rifle that I bought 2 years ago,the trigger was real heavy so I took it to a gunsmith to get a trigger job. I never had any misfire problems. I got a new barrel for 45\70. I shot a box of Winchester and I had about 4 bullets that did not fire. I also bought a box of Hornady, and out of one box I had 2 misfires. The primer has a good dent on it from the firing pin. Any ideas?