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

albertan
.333 member

Reged: 13/06/06
Posts: 432
Loc: Alberta, Canada

Re: Anyone run into this problem?
23/04/15 07:01 AM

I don't believe that older (pre-Extreme) H-4831 would have given you this much grief. Norma used to suggest Norma MRP-2,( now discontinued) which is much slower than H-4831. Even IMR 7828 is slower than H-4831, but it doesn't have the pixie dust that gives it as much temperature resistance, particularly at low temperatures as the Extreme H-4831. I do believe that this pixie dust requires pressures in the 60,000 psi range in order for the slower burning Extreme powders to work as advertised. But the IMR 4831, and the IMR 7828, do work better in the 40,000 psi range in cases like the Nitro Express numbers, the .416 Rigby, and the .505 Magnum Gibbs.

I still stand by my earlier assertion that IMR 4831 and IMR 7828 would be my first choices for powders with both 525 and 600 grain bullets. IMR 7828 is listed in the Barnes manual for use with their 525 grain Banded Solids, and their Triple Shocks. 90% plus loading densities in each case.

It may be me being superstitious, but I personally would avoid compressed loads in this cartridge. Just enough room to hear the distinctive tinkle of powder jiggling in the loaded case would calm my nerves before taking this cartridge into battle. A sort of final , final, final check.

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Subject	Posted by	Posted on
Anyone run into this problem?	Benchshooter	02/04/15 05:18 AM
Re: Anyone run into this problem?	Birdhunter50	21/04/15 10:36 PM
Re: Anyone run into this problem?	albertan	21/04/15 11:21 PM
Re: Anyone run into this problem?	Benchshooter	22/04/15 05:23 AM
Re: Anyone run into this problem?	albertan	22/04/15 04:34 PM
Re: Anyone run into this problem?	Benchshooter	23/04/15 04:07 AM
Re: Anyone run into this problem?	albertan	23/04/15 07:01 AM
Re: Anyone run into this problem?	Benchshooter	01/05/15 03:16 AM
Re: Anyone run into this problem?	Ash	01/05/15 06:09 PM
Re: Anyone run into this problem?	DarylS	02/05/15 12:21 AM
Re: Anyone run into this problem?	Benchshooter	02/05/15 05:12 AM
Re: Anyone run into this problem?	chuck375	05/05/15 12:01 PM
Re: Anyone run into this problem?	albertan	07/05/15 12:32 PM
Re: Anyone run into this problem?	DarylS	08/05/15 01:33 AM
Re: Anyone run into this problem?	albertan	19/05/15 02:29 PM
Re: Anyone run into this problem?	Benchshooter	22/05/15 10:06 AM
Re: Anyone run into this problem?	Rule303	22/05/15 04:30 PM
Re: Anyone run into this problem?	DarylS	03/05/15 12:53 AM
Re: Anyone run into this problem?	Marrakai	03/05/15 10:49 AM
Re: Anyone run into this problem?	Benchshooter	04/05/15 01:53 AM
Re: Anyone run into this problem?	DarylS	02/04/15 01:51 PM
Re: Anyone run into this problem?	Benchshooter	02/04/15 09:22 PM
Re: Anyone run into this problem?	mauserand9mm	02/04/15 09:25 PM
Re: Anyone run into this problem?	DoubleD	02/04/15 11:24 PM
Re: Anyone run into this problem?	DarylS	03/04/15 01:55 AM
Re: Anyone run into this problem?	Benchshooter	03/04/15 03:00 AM
Re: Anyone run into this problem?	mauserand9mm	03/04/15 05:26 PM
Re: Anyone run into this problem?	albertan	19/04/15 11:25 PM
Re: Anyone run into this problem?	Benchshooter	21/04/15 10:00 AM
Re: Anyone run into this problem?	albertan	21/04/15 03:35 PM
Re: Anyone run into this problem?	albertan	21/04/15 04:20 PM
Re: Anyone run into this problem?	Benchshooter	21/04/15 09:01 PM
Re: Anyone run into this problem?	eagle27	21/04/15 04:59 PM
Re: Anyone run into this problem?	mauserand9mm	02/04/15 09:21 PM

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