Age brittle brass: I had 19 cased for a 9.3x82R that were set uo for a D chamber which is slightly smaller than the E or later unified chamber. The chamber of my rifle is based upon the unified 9.3x82r. Apparently the cases ,ay have been brittle.

I decided to fireform these to my double rifle. Many split which was disappointing (& costly). I had anealed the brass some 5 - 10 years ago when I was shooting a kipplauf in 9.3x82r that had a tight chamber, Of course, I now wish I had anealed that brass again before fire forming.

BTW, I used the same charge I used in forming some 450 3 1/4" from 450/400 3 1/4". The procedure I used was 10 gr bullseye and a case of cheam of wheat with a wax plug. The report was very mild and I didn't think there was an issue until I returned home and cleaned the brass. Cracks about an inch from the rim. Looking back, I could have used a lighter charge. The case is a very long (3 1/4"), narrow case andf perhaps the cerial bunched up, and combined with the amount expansion and somewhat brittle case, I got splits.