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Double Rifles, Single Shots & Combinations >> Double Rifles

DarylS
.700 member

Reged: 10/08/05
Posts: 26867
Loc: Beautiful British Columbia, Ca...

Re: 300 H&H as a double round
29/12/11 07:17 AM

I see your points & reasononing, Dugaboy. As to the normal extractors purchase on a large rim as opposed to the small pawl of a rimless design - point well taken.

As to the straighter sided case shape causing problems at some point if a weak extraction rifle, I still see .005" to .010" taper per side as being quite enough due to the additional .001" contraction of the brass all the way around.

I've tested the extraction of a .257 IMP case in a Mauser bolt rifle that had NO extractor- back in 1978. The rounds fell from the chamber when the muzzle was raised. There had been no primary extraction. I've since (last year) checked that initial test of extractor removed with both a 9.3x62 and my .375/06IMP with identical results. In the 9.3x62 test, the case matched a normal Ackley Imp. case with .009" taper per side in my factory chambered Mauser rifle, while my .375/06IMP has even less taper, only .005" per side. In both, the rounds fell from the chamber when no primary extraction was used (no extractors). This showed me, they'd probably work well in any rifle with poor extraction.

As to pressures developed,I can only speak to velocities. The 9.3x62 runs 2,519fps with 286gr. Normas and 2,675 fps with 270 Speers. My .375 does 2,740fps with 270gr. TSX and 2,470fps with 4 different makes of 300's. I submit pressures "are up there". None of these rifles has expanded a primer pocket in firing these loads, many times each.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Subject	Posted by	Posted on
300 H&H as a double round	davidindallas	06/12/11 07:00 PM
Re: 300 H&H as a double round	doubleriflejack	09/12/11 06:21 AM
Re: 300 H&H as a double round	davidindallas	10/12/11 03:47 PM
Re: 300 H&H as a double round	NitroX	11/12/11 01:01 AM
Re: 300 H&H as a double round	DarylS	11/12/11 05:31 AM
Re: 300 H&H as a double round	DUGABOY1	28/12/11 01:02 PM
Re: 300 H&H as a double round	DarylS	29/12/11 07:17 AM
Re: 300 H&H as a double round	DUGABOY1	30/12/11 09:50 AM
Re: 300 H&H as a double round	CHAPUISARMES	11/12/11 11:32 AM
Re: 300 H&H as a double round	davidindallas	11/12/11 03:32 PM
Re: 300 H&H as a double round	DarylS	12/12/11 04:13 AM
Re: 300 H&H as a double round	bonanza	08/12/11 07:31 AM
Re: 300 H&H as a double round	DUGABOY1	09/12/11 05:55 AM
Re: 300 H&H as a double round	AkMike	08/12/11 11:34 AM
Re: 300 H&H as a double round	500Nitro	08/12/11 11:38 AM
Re: 300 H&H as a double round	500Nitro	06/12/11 07:46 PM
Re: 300 H&H as a double round	NitroX	07/12/11 01:57 AM
Re: 300 H&H as a double round	davidindallas	07/12/11 01:53 PM
Re: 300 H&H as a double round	NitroX	07/12/11 02:48 PM
Re: 300 H&H as a double round	CptCurl	07/12/11 10:42 PM
Re: 300 H&H as a double round	davidindallas	07/12/11 01:47 AM

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