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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

4seventy
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Reged: 07/05/03
Posts: 2210
Loc: Queensland Australia

Re: donor shotguns?
08/03/20 09:01 PM

For anyone contemplating converting a shotgun to a double rifle, the book mentioned above by Ellis Brown does indeed contain a lot of useful information, and is a very good place to start.

However now might be the right time to again mention that there are some errors concerning Breech Thrust calculations in the first edition of this book.

These errors are on page 19 of the first edition.
I don't know if these errors have been corrected or not in later editions.

The errors relate to calculations using Proof pressure, cartridge case dimensions, and chamber pressure, to obtain breech thrust figures.

The math is not done correctly, resulting in a GROSS over estimation of the breech thrust that a particular action supposedly endured and passed during proofing.

Breech thrust is a very important factor with DR's, and getting it wrong is a very bad idea.

Post Extras

Entire topic
Subject	Posted by	Posted on
donor shotguns?	szihn	04/03/19 03:04 AM
Re: donor shotguns?	DarylS	04/03/19 05:33 AM
Re: donor shotguns?	Hunter4752001	04/03/19 08:53 AM
Re: donor shotguns?	NitroX	04/03/19 07:45 PM
Re: donor shotguns?	szihn	04/03/19 04:10 PM
Re: donor shotguns?	Jim_C	05/03/19 05:39 PM
Re: donor shotguns?	4seventy	08/03/20 08:34 PM
Re: donor shotguns?	4seventy	08/03/20 09:01 PM
Re: donor shotguns?	crshelton	09/03/20 06:03 AM
Re: donor shotguns?	4seventy	10/03/20 04:09 PM
Re: donor shotguns?	crshelton	11/03/20 01:59 PM
Re: donor shotguns?	crshelton	15/03/20 09:58 AM
Re: donor shotguns?	4seventy	16/03/20 09:34 AM
Re: donor shotguns?	GGB	04/03/20 01:53 PM
Re: donor shotguns?	3DogMike	06/03/20 11:01 AM
Re: donor shotguns?	DarylS	07/03/20 05:34 AM
Re: donor shotguns?	GGB	08/03/20 07:46 AM
Re: donor shotguns?	DarylS	08/03/20 08:16 AM
Re: donor shotguns?	crshelton	05/03/20 09:56 AM
Re: donor shotguns?	crshelton	05/03/20 10:23 AM
Re: donor shotguns?	Wayne59	05/03/20 01:56 PM
Re: donor shotguns?	DarylS	05/03/20 04:32 PM
Re: donor shotguns?	DarylS	05/03/20 10:09 AM
Re: donor shotguns?	Ripp	05/03/19 02:14 AM
Re: donor shotguns?	NitroX	04/03/19 07:43 PM

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