Im having trouble with split necks. It is new Remimgton brass 22-250 loaded 18 years ago. I shot it in 3 22-250 rifles measured neck before and after. .250 before and. 254 after. It splits every case in all rifles. No signs of excessive pressure. I have 400 rounds left over from a 1995 varmint hunt. Varget powder. I had a guy tell me brass will get brittle with age even if you dont shoot it. I had no trouble with it splitting necks in 95 when i last used it. Any advice?