After about 600 rnds of flawless shooting, my mod 94ae 38/55 JES rebore began to misfire suddenly about 2 wks ago. I took it to my gunsmith, me dismantled it removed the firing pin, inspected and cleaned the bolt with brake cleaner said all looked ok. I had forgotten the bring ammo so he couldn't examine it, but suggested I check it for thinned case heads causing excessive headspace. I did this with a dial caliper, can't tell any difference between my 3x shot brass and new brass in thickness of the rims. He also suggested I try Winchester primers since they are softer then the CCI I was using. I have done this as well, nothing's worked. I recently began priming on my new Lee Classic Turret so I thought I might be seating the primers too deep- tried not seating so hard- no help. Any Ideas? Gunsmith says he's lost.