I was going through my 8x57 brass, and noticed that about 1/2 of them from my reloads have cracks in the brass between the shoulder and the neck. No bulges, no powder marks, just cracks. I've never loaded these things hot, though some of them may have been reloaded 2-3 times. Is this an indication of a bigger problem, or have I simply worn out the brass from reloading it? Every round was fired in a post-war M43 Spanish Air Force Mauser carbine (K98 clone), manufactured in the early 1950s.