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

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casper50
.400 member

Reged: 18/10/07
Posts: 1342
Loc: Alaska

Re: Mauser with no caliber marks. [Re: casper50]
#336220 - 06/01/20 08:34 AM

is this bolt for rimmed or rimless?

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casper50
.400 member

Reged: 18/10/07
Posts: 1342
Loc: Alaska

Re: Mauser with no caliber marks. [Re: casper50]
#336221 - 06/01/20 08:37 AM

depth from bolt face to part of extractor that would catch the case is .07"

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xausa
.400 member

Reged: 07/03/07
Posts: 2037
Loc: Tennessee, USA

Re: Mauser with no caliber marks. [Re: casper50]
#336243 - 06/01/20 08:51 PM

In fireforming a case with a light load in a chamber with unknown headspace, the case should be lubricated, allowing the pressure generated by the ignition to force the case head firmly back against the bolt face. You won't get a reliable measurement otherwise, since the firing pin fall will force the entire cartridge all the way forward and the adherence of the dry case to the chamber walls coupled with the low pressure will keep it from being forced back, resulting in a protruding primer and an inaccurate headspace reading.

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DarylS
.700 member

Reged: 10/08/05
Posts: 26489
Loc: Beautiful British Columbia, Ca...

Re: Mauser with no caliber marks. [Re: xausa]
#336262 - 07/01/20 04:00 AM

That bolt face & extractor appears to be standard for .469" or .470" rim.

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

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

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Rothhammer1
.400 member

Reged: 06/01/17
Posts: 1808
Loc: The Redwoods of California

Re: Mauser with no caliber marks. [Re: xausa]
#336279 - 07/01/20 08:28 AM

Quote:

the firing pin fall will force the entire cartridge all the way forward and the adherence of the dry case to the chamber walls coupled with the low pressure will keep it from being forced back, resulting in a protruding primer and an inaccurate headspace reading.

On a controlled feed bolt? Is this possible?

Controlled Feed

--------------------
Citizen of the Cherokee Nation

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justcurious
.333 member

Reged: 17/03/10
Posts: 285
Loc: Germany

Re: Mauser with no caliber marks. [Re: Rothhammer1]
#336292 - 07/01/20 09:27 PM

Headspace aside it is possible , but only 0,3 mm maximum depending on the thickness of the cartridge rim.
There is that little play of the extractor in the slot on the bolt.

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DarylS
.700 member

Reged: 10/08/05
Posts: 26489
Loc: Beautiful British Columbia, Ca...

Re: Mauser with no caliber marks. [Re: Rothhammer1]
#336314 - 08/01/20 05:14 AM

The protruding primers absolutely happens with controlled round feed rifles, with ctgs producing less than about 45,000psi.

Ctgs. over that pressure level then usually stretch at the web and re-seat the primer, flattening it excessively in the process. Many see the excessive headspace result as being high pressure, when it is not.

Thus the excessive headspace caused what will become case head separations along the way & usually with the next firing, if the shoulder is shoved back during reloading that case/s.

Case head separations are caused by firing unaltered ctgs. in rifles with excessive headspace, not by excessive pressure.

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

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

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