A friend of mine showed me some cases of a 22-250 that had vertical splits in the neck about half way from the mouth to the shoulder. The top third of the case was smoked up quit a bit. This was new brass, he was using a charge of 32. grns of H380 loading 55 grn nosler bt's. He also loaded with the same brass and bullet a charge of 32.5 grns of BL-C(2) and they showed no ill effects. I was thinking that the H380 load was just not enough powder charge to allow the neck to expand causing the gas to flow around the top of the case. He said the smokey loads shot in an inch and didn't notice the splits till he got home. What do you all think.