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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

85lc
.400 member

Reged: 19/01/18
Posts: 1190
Loc: Georgia, USA

Re: .458 Winchester Magnum
12/06/25 07:30 AM

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.

--------------------
RB

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Subject	Posted by	Posted on
.458 Winchester Magnum	NitroX	10/06/25 01:57 AM
Re: .458 Winchester Magnum	85lc	10/06/25 02:43 AM
Re: .458 Winchester Magnum	bwanabobftw	10/06/25 06:48 AM
Re: .458 Winchester Magnum	Claydog	10/06/25 08:04 AM
Re: .458 Winchester Magnum	DarylS	10/06/25 09:23 AM
Re: .458 Winchester Magnum	Rule303	10/06/25 11:21 AM
Re: .458 Winchester Magnum	85lc	11/06/25 05:41 AM
Re: .458 Winchester Magnum	DarylS	11/06/25 10:58 PM
Re: .458 Winchester Magnum	85lc	12/06/25 01:33 AM
Re: .458 Winchester Magnum	DarylS	12/06/25 04:58 AM
Re: .458 Winchester Magnum	85lc	12/06/25 07:30 AM
Re: .458 Winchester Magnum	DarylS	12/06/25 09:26 AM

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