I recently "inherited" 1000 rnds of .41mag 210 gr HPs. When I tried them out, 75% of the cases split just behind the bullet seat. I fired about 20 rnds. I then fired 50 rounds of factory ammo without a hitch. the reloads don't appear to be too hot, judging from the recoil. Will the splitting cases hurt the cylinder? After cleaning, there was no physical damage to see. Do I throw 1000 rnds in the trash?