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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?
      16/03/20 09:34 AM

Hi crshelton,
Thank you for posting the info from the 2nd edition of this book.

It's interesting to note that the author has reduced the claimed proof pressure which was printed in the 1st edition by a large amount.
1st edition-32,000+psi.
2nd edition-13,000+psi.

That's a step in the right direction.

However, when calculating the force against the breech, he has still made the same mistake as in the 1st edition.

He has again used the case head DIAMETER when he should have used case head AREA in square inches. {.515 sq in}

His 2nd edition (incorrect) calculation using case head DIAMETER of breech thrust resulted in 10,530 pounds force against the breech.

Using case head area, would result in the considerably lower figure of 6,695 pounds force against the breech.

His figure of 10,530 is approx 50% higher than 6,695!

As I mentioned before, despite the math errors concerning proof pressures and breech thrust calculations, the book does contain some very good ideas on how a shotgun to double rifle conversion can be done.

Cheers
4seventy

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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? NitroXAdministrator   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? NitroXAdministrator   04/03/19 07:43 PM

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