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

458ONLY
.224 member

Reged: 20/06/08
Posts: 24
Loc: Ontario, Canada

Re: 458 Winchester Magnum Question
30/12/09 08:18 AM

[quote

Personally have a .458 also and do NOT have a problem reaching 2200 fps with 500 gr bullets..

Ripp

Couldn't have said it better myself!

It's also true about the "spill" problem. A former employee of Winchester, who was involved in identifying and solving the problem (after several years!)has revealed that in writing when there was no chance of repercussions from Winchester since they no longer exist as a company... (in name only they exist).

It's also NOT true that all companies used 30" test barrels! Few, if any, do that today. Mostly 26", or 24"... and in some situations it's 22".

True, the CUP method was flawed... and it has taken too many years to figure out an equivalent pressure in PSI, or even what 53,000 CUP represented in PSI (piezo). Today, it's something like 62, 500 psi. That's MAP (maximum average pressure) which means that an acceptable load would have that average. That could be, for example, a low of 60,000 and a high of 65,000 psi. Loads for a Big Bore, like the 458WM, rarely vary more than 2000 to 3000 psi with the best modern powders. My loads vary less than that.

The problem for Winchester, in the early days, was the powder they used, plus the equipment that was not suited to loading ball powder. That's been resolved long ago. The best powders for the 458WM today are ball powders, which are greatly improved. The best powders for the 450s and 500s are AA2230, TAC and H335, all ball powders. 2200 fps can be efficiently achieved with any of them employing a 500gr in a 24" barrel, and in some cases a 22".

Bob

www.bigbores.ca

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Subject	Posted by	Posted on
458 Winchester Magnum Question	LFOD1776	06/09/09 07:04 AM
Re: 458 Winchester Magnum Question	458ONLY	17/12/09 10:10 AM
Re: 458 Winchester Magnum Question	bwananelson	17/12/09 11:35 AM
Re: 458 Winchester Magnum Question	Tatume	17/12/09 11:55 AM
Re: 458 Winchester Magnum Question	bwananelson	17/12/09 01:25 PM
Re: 458 Winchester Magnum Question	Indy	04/11/09 02:17 PM
Re: 458 Winchester Magnum Question	bipbigbore	18/11/09 09:51 AM
Re: 458 Winchester Magnum Question	DUGABOY1	08/09/09 09:34 AM
Re: 458 Winchester Magnum Question	4seventy	29/12/09 02:46 PM
Re: 458 Winchester Magnum Question	Ripp	29/12/09 03:00 PM
Re: 458 Winchester Magnum Question	458ONLY	30/12/09 08:18 AM
Re: 458 Winchester Magnum Question	DarylS	30/12/09 03:55 AM
Re: 458 Winchester Magnum Question	bigmaxx	30/12/09 04:10 AM
Re: 458 Winchester Magnum Question	4seventy	17/12/09 01:55 PM
Re: 458 Winchester Magnum Question	Altamaha	18/12/09 02:57 PM
Re: 458 Winchester Magnum Question	4seventy	18/12/09 06:59 PM
Re: 458 Winchester Magnum Question	450_366	18/12/09 07:40 PM
Re: 458 Winchester Magnum Question	bonanza	08/09/09 10:07 AM
Re: 458 Winchester Magnum Question	9.3x57	08/09/09 11:49 AM
Re: 458 Winchester Magnum Question	KILLERtj	06/10/09 02:39 PM
Re: 458 Winchester Magnum Question	bonanza	06/09/09 07:26 AM
Re: 458 Winchester Magnum Question	Tatume	06/09/09 08:02 AM
Re: 458 Winchester Magnum Question	tinker	06/09/09 08:19 AM
Re: 458 Winchester Magnum Question DELETED DELETED	grandveneur	06/09/09 09:01 AM
Re: 458 Winchester Magnum Question	controlled_feed	06/09/09 10:46 AM
Re: 458 Winchester Magnum Question	bonanza	06/09/09 01:34 PM
Re: 458 Winchester Magnum Question	bonanza	06/09/09 01:40 PM
Re: 458 Winchester Magnum Question	LFOD1776	06/09/09 11:52 AM
Re: 458 Winchester Magnum Question	bonanza	06/09/09 02:04 PM
Re: 458 Winchester Magnum Question	LFOD1776	06/09/09 11:30 PM
Re: 458 Winchester Magnum Question	tinker	07/09/09 12:20 AM
Re: 458 Winchester Magnum Question	controlled_feed	07/09/09 09:01 AM
Re: 458 Winchester Magnum Question	ozhunter	07/09/09 05:42 PM
Re: 458 Winchester Magnum Question	9.3x57	07/09/09 11:12 PM
Re: 458 Winchester Magnum Question	DarylS	19/11/09 02:49 AM
Re: 458 Winchester Magnum Question	Sarg	07/09/09 06:38 PM
Re: 458 Winchester Magnum Question	tinker	06/09/09 01:32 PM

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