Shooting @ range today, 44 Mag Vaquero, 100 rounds, about 20 had light primer strikes, all but 8 fired after several attempts. These were WIN large pistol primers, have used them B4 & no problem, seating depth seemed ok on all rounds, have Wolff spring in the gun for lighter trigger pull, why would some fire with normal strike yet 20% showed lighter detent from primer strike? Are Winchester primers "harder"? If so what is a good choice of "softer" primer? This really has me puzzeled, thoughts please.