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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles

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eagle27
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Reged: 24/01/09
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242323 - 13/02/14 05:01 PM

Quote:

Hello Igorrock,

The 350g bullets I got from Hawk measure .424" - .425" diameter. I'm not sure what the nominal bore and groove dimensions are for the 10.75x68. Do you know?

My own Mauser Type A which started life as a 10.75x68 now opened up to 10.75x73 (404 Jeffery) has the barrel stamped on the underside, 10.45mm and 10.75mm (that's .411" bore and .423" groove). It shoots both the 10.75x68 RWS 347gr bullets and .404 RWS 400gr bullets perfectly.

My own and others 350 - 400gr cast bullets sized .424" shoot fine in this rifle too.

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RobertL
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Reged: 21/04/11
Posts: 21
Loc: Germany

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242332 - 13/02/14 07:14 PM

Hello Buckstix,

I have measured (pushed a lead ball through the barrel) several rifles in this cartridge and the barrels are different.
My before World War One is in near mint condition and the barrel is 10,78mm which is 0.4244”
My before Second World War also in near mint condition is 10,75mm, which is 0.4232”

Some of my friends well used once, are running as high as 10,8mm which is 0.4252”

For those, I swage down Sierras .430” 300 grains pistol bullets to .4245” with fine accuracy. Slug your barrel and unless it is not too worn your Hawk bullets measuring .424 to .425 should be fine.

Robert

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Igorrock
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Reged: 01/03/07
Posts: 1684
Loc: Finland

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242333 - 13/02/14 07:18 PM

Quote:

I'm not sure what the nominal bore and groove dimensions are for the 10.75x68. Do you know?

I don´t but it´s easy for you to test yours barrel.

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buckstix
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Reged: 07/11/12
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: Igorrock]
#242337 - 13/02/14 09:56 PM

Hello Robert1, Igorrock,

Thank you both for your replys. Slugging the barrel will be on my "to do" list for the weekend, unless the beass shows up, in which case I'll just try a few rounds with the Hawk bullets.

Hello eagle27,

Quote:

It shoots both the 10.75x68 RWS 347gr bullets and .404 RWS 400gr bullets perfectly.

When you say it shoots the .4o4 RWS bullets perfectly, are those actually .404" diameter?

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Viking338
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Reged: 11/08/11
Posts: 480
Loc: Queensland Australia

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242341 - 13/02/14 11:59 PM

Quote:

Hello Robert1, Igorrock,

Thank you both for your replys. Slugging the barrel will be on my "to do" list for the weekend, unless the beass shows up, in which case I'll just try a few rounds with the Hawk bullets.

Hello eagle27,

Quote:

It shoots both the 10.75x68 RWS 347gr bullets and .404 RWS 400gr bullets perfectly.

When you say it shoots the .4o4 RWS bullets perfectly, are those actually .404" diameter?

Should be .423 I think.

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buckstix
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Reged: 07/11/12
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: Viking338]
#242355 - 14/02/14 04:30 AM

Hello Viking338,

Yes, I believe that's correct.

--------------------
"You never pay too much for something, you only buy it too early."

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eagle27
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Reged: 24/01/09
Posts: 1216
Loc: Rolleston, Christchurch, New Z...

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: Viking338]
#242359 - 14/02/14 05:04 AM

Quote:

Quote:

Hello Robert1, Igorrock,

Thank you both for your replys. Slugging the barrel will be on my "to do" list for the weekend, unless the beass shows up, in which case I'll just try a few rounds with the Hawk bullets.

Hello eagle27,

Quote:

It shoots both the 10.75x68 RWS 347gr bullets and .404 RWS 400gr bullets perfectly.

When you say it shoots the .4o4 RWS bullets perfectly, are those actually .404" diameter?

Should be .423 I think.

The .404 Jeffery is always referred to as shown, .404 but the bullet diameter (groove diameter) is .423". The .404 Jeffery is aka 10.75x73 so is exactly the same barrel as the 10.75x68.

Some, including myself, believe the 404 nomenclature comes from 40 cal with 4 cartridges available in the Jeffery (Mauser) bolt action rifle. Jeffery's advertising made great store of the 4 available shots from his rifles and of course it is a cartridge in what is widely known as the 40 calibre group (.404J, 416R, 425WR)

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Huvius
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Reged: 04/11/07
Posts: 3618
Loc: Colorado

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: eagle27]
#242361 - 14/02/14 05:27 AM

True that the 404 Jeffery and the 10.75X68 Mauser both use a nominally .423" bullet, I am thinking the rifles originally chambered for the 404 have a faster twist for the heavier bullets intended for the 404.
I don't have a 404 of my own anymore, but it would be interesting to get some twist rates of a few of the original rifles for comparison. I can get a measurement of my two 10.75s though.

--------------------
He who lives in the past is doomed to enjoy it.

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kuduae
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Reged: 13/01/10
Posts: 1806
Loc: middle of Germany

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: Huvius]
#242365 - 14/02/14 06:00 AM

Jon Speed in his book "Mauser-Original Oberndorf Sporting Rifles" on page 275 shows a bore dimension table from the Mauser factory dated 1926. This should apply to your rifle too. Mauser then prescribed these barrel dimensions and tolerances for the 10.75x68:
bore/land: 10.45 (+ .05) mm = .411 - .413"
rifling groove: 10.75 (+ .05) mm = .423 - .425"
Rifling twist, one turn in 420 mm = 16.54"
CIP Maximum bullet diameter is 10.78 mm = .424"
The DEVA handbook gives this pressure tested 10.75x68 load with components available in the USA:
RWS case, Woodleigh .423" 347gr solid or soft nose bullet, CCI 200 primer, 67.5 gr VV N140 powder for a mv of 687 m/s = 2254 fps, pressure at 2956 bar well below the 3300 bar CIP maximum.
BTW, Larry Schuknecht offers good Mauser reproduction buttplates,
http://www.dutchmanwoodworks.com/buttplat.htm
As your rifle was made in early 1924, both the early "WM" and the later "Mauser" type would be correct, as the transition started just in 1924.

Huvius, the 1926 Mauser table gives the same bore-groove diameters and rifling twist dimensions for the .404 too.

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Huvius
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Loc: Colorado

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: kuduae]
#242371 - 14/02/14 09:10 AM

Quote:

Huvius, the 1926 Mauser table gives the same bore-groove diameters and rifling twist dimensions for the .404 too.

Did not realize that. Maybe my DSB should become a 404 after all... Or maybe not...

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Viking338
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Reged: 11/08/11
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242374 - 14/02/14 12:09 PM

Quote:

Hello Viking338,

Yes, I believe that's correct.

Hello Buckstix

Gets confusing for the new fella's I think. The whole .303 being a .312 bullet diameter used to to confuse me as a younger fella then as I read more and bought more toys I just accepted it as one of the things that makes this hobby so interesting

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buckstix
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: kuduae]
#242381 - 14/02/14 01:01 PM

Hello Kuduae,

Thank you for the information about the groove and bore. My barrel is marked on the bottom;

"BS 10.45 . 10.75 . 420"

Would you have any idea what the "BS" stands for? I'm sure its not "Buck Stix".

I've thought about a replacement buttplate, but then I'm thinking that its been such a long time since it had one, I'm going to just leave it as is. With the edges being so rounded, I would have to cut a slice off the stock to get to crisp edges, and I think that would look like a "new" modification. I like the "Old World Look" that it now has. Maybe I'll come up with something to dress up the holes.

--------------------
"You never pay too much for something, you only buy it too early."

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kuduae
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Reged: 13/01/10
Posts: 1806
Loc: middle of Germany

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: buckstix]
#242435 - 15/02/14 07:48 AM

Would you have any idea what the "BS" stands for? I'm sure its not "Buck Stix".

AFAIK these letter codes are Mauser factory internal designations for the barrel steel used, source and lot. F.i. most eaarly Mauser .22 rifles have a "Ch54" steel code marked on their barrels. Sorry, but these barrel steel codes are not documented, so they are unintelligible today.

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Igorrock
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Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: kuduae]
#242436 - 15/02/14 07:58 AM

Quote:

what the "BS" stands for?

Could it mean Bessemer Stahl....?

http://en.wikipedia.org/wiki/Bessemer_process

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kuduae
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Reged: 13/01/10
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Loc: middle of Germany

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: Igorrock]
#242445 - 15/02/14 10:27 AM

Quote:

Quote:

what the "BS" stands for?

Could it mean Bessemer Stahl....?

http://en.wikipedia.org/wiki/Bessemer_process

Not likely, as Bessemer is just a steel making procedure. Mauser apparently used these codes for individual steel charges supplied by different steelworks. "Bessemer Steel" would have been too generic. And, the basic Bessemer process was not used for high grade steels any more after 1900.

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LongIsland
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Reged: 09/02/09
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Loc: New York, U.S.A.

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: kuduae]
#242452 - 15/02/14 01:47 PM

I have a Type B in .30/06 with barrel markings BS 7,6 7,85.250

When I inquired to Jon Speed he stated the BS is the stamp for Bohler Steel used in the barrel

Bob

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Igorrock
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Loc: Finland

Re: FOUND A 10.75X68 WITH AFRICAN HISTORY [Re: LongIsland]
#242459 - 15/02/14 09:29 PM

Quote:

BS is the stamp for Bohler Steel

Most probably that.

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