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Double Rifles, Single Shots & Combinations >> Single Shots & Combination Guns

470Rigby
.333 member

Reged: 23/02/04
Posts: 328
Loc: Melbourne, Australia

Re: 375 MAG FL NE on MH
11/07/04 10:42 AM

KWK

These old Martini actions were originally designed for the 577/450 Black Powder cartridge, and were later adopted for Nitro cartridges when the 215 grain Mk V1 .303 was in vogue. This developed about 17 tpsi, so giving the Gunmakers of the day their due, I guess they deemed the action satisfacory for that pressure AND cartdridge head size.

Original ballistics for the .375 Flanged Magnum developed slightly more pressure at 18 tpsi, but the base area is substantially bigger than the .303 (.456" for the .303 and .511" for the .375).

Actually, in calculating "Bolt Thrust" it is the internal sectional area at the base that factors in, and to do a proper comparision, you would have to section some cases and measure that, but by my estimation, the difference between the thrust acting back on the Breech Block would be in the order of 30% higher with the .375 Flanged Magnum; that is if it was loaded to original ballistics!

The .375 Flanged Magnum, being essentially a handloading proposition, there will always be those that will be tempted to drop in a heavier pill....a few extra grains of powder...and...?

Just sounding a note of caution.....

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Entire topic
Subject	Posted by	Posted on
375 MAG FL NE on MH	DoubleD	29/01/04 05:14 PM
original pressures	bpesteve	23/07/04 09:55 AM
Re: original pressures of .375 Fl Mag NE	DoubleD	25/07/04 06:39 AM
Re: 375 MAG FL NE on MH	Levallois	31/01/04 02:24 AM
Re: 375 MAG FL NE on MH	DoubleD	06/07/04 07:44 AM
Re: 375 MAG FL NE on MH	470Rigby	06/07/04 08:52 AM
Re: 375 MAG FL NE on MH	KWK	10/07/04 04:09 PM
Re: 375 MAG FL NE on MH	470Rigby	11/07/04 10:42 AM
Re: 375 MAG FL NE on MH	KWK	11/07/04 03:50 PM
Re: 375 MAG FL NE on MH	KWK	11/07/04 04:38 PM
Re: 375 MAG FL NE on MH	NitroX	11/07/04 07:04 PM
Re: 375 MAG FL NE on MH	DoubleD	11/07/04 09:46 PM
Re: 375 MAG FL NE on MH	KWK	12/07/04 03:05 AM
Re: 375 MAG FL NE on MH	DoubleD	06/07/04 09:15 AM

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