hi guys,been awhile,(i'm a truck driver,don't get to play but a few days a month).have any of you guys exp. any case failures w/wolf ammo? shot 20 rds through my m-44 about a week ago and just noticed that 2 of the cases are split lengthwise along the shoulder. both are about 1/8" long and only extend to crease in shoulder. gun is in excellent,unissued cond. and have shot approx. 100 rds thru it w/no probs.