Hi forum members. Today I shot for first time my combination gun of 8X58RSauer with some ammo from Reed’s Ammunition & Research I had bought a few years back. These rounds are made with reformed cases of 303 British. I fired 8 rounds of 175g soft point .318 bullets and 3 of 200g soft point bullets. Of the 8 rounds 175g bullets, 4 cases splintered near the mouth of the case. Also, I can see some discoloration near the mouth of the cases that did not split. The cases are very thin at the mouth. What do you think the cause is? Any help would be greatly appreciated. I have pics of the fired cases but I am not sure how to post them. If you can assist me with that, it would be great. Thank you, Bill