I have a friend that has had a 22 Cheetah for years, forms and loads his own ammo
He showed me some brass that he had sized and loaded about 1 year ago but did not fire form them at the time of loading
Decided to shoot for the fireform and the shoulder split on the cases
He told me this was the first brass he has had split with the only difference being the rounds set for a year before firing.
We decided to remove the bullets and powder/primers on the remaining shells and anneal the cases
After annealing 20 out of 30 cases split at the neck when sizing in the press
Brass was rem br 308
the only thing he has done different from all the previous rounds he has made was letting the brass set the year before fire forming


Anyone have any idea what is going on with the brass?
Thanks for any input- this has me stumped
Jack