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Shooting & Reloading - Mausers, Big Bores and others >> Mauser Discussion Forum

bpesteve
.300 member

Reged: 18/11/03
Posts: 106
Loc: Sunset side up

Re: Renumbered Type B Mauser in 8 x 60
08/02/09 05:00 AM

A couple of thought on the S -vs- J bore possibilities for this rifle:

>>Regardless of what the marks are the best way to go about this is to make a chamber cast and slug the barrel. The chamber cast will tell you whether the neck area is likely to allow free release of .323" bullets (comparing that diameter to a loaded round, for instance) and the bore slug will tell you pretty exactly what bore and groove dimensions you are really dealing with.

>>One of the principal differences between J and S bores is the depth of the rifling, with the grooves of the S bore being deeper. The German loading manual "Wiederladen" (4th edition) gives some _current_ specs on this:

8x57J and JR bore 7,80mm - groove 8,07mm - giving a groove depth of 0,135mm (.005" or so)
These dimensions are also given for the 8x57R/360, 8x58R Sauer and the 8x72R

8x57JS and JRS bore 7,89mm - groove 8,20mm - giving a groove depth of 0,155mm (.006" or so)

The 7,85 and 8,15 marks on your rifle give a groove depth of 0,150mm (.0059" or so)

>>Given all this, my _guess_ would be that this rifle was intended to be an S bore, the fly in that ointment being that I really would have expected the "8x60" mark on your rifle to read explicitly "8x60S". The primary consideration is still the neck clearance!

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Subject	Posted by	Posted on
Renumbered Type B Mauser in 8 x 60	mckinney	29/01/09 09:33 AM
Re: Renumbered Type B Mauser in 8 x 60	paradox_	29/01/09 01:17 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	29/01/09 03:17 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	29/01/09 03:19 PM
Re: Renumbered Type B Mauser in 8 x 60	pjaln	29/01/09 03:07 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	29/01/09 03:25 PM
Re: Renumbered Type B Mauser in 8 x 60	JabaliHunter	29/01/09 10:36 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	30/01/09 03:36 AM
Re: Renumbered Type B Mauser in 8 x 60	pjaln	30/01/09 12:49 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	30/01/09 01:02 PM
Re: Renumbered Type B Mauser in 8 x 60	pjaln	30/01/09 02:51 PM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	30/01/09 03:32 PM
Re: Renumbered Type B Mauser in 8 x 60	bpesteve	03/02/09 02:03 AM
Re: Renumbered Type B Mauser in 8 x 60	mckinney	06/02/09 01:56 AM
Re: Renumbered Type B Mauser in 8 x 60	bpesteve	08/02/09 05:00 AM

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