Conor_90
.224 member
Reged: 12/01/18
Posts: 45
Loc: Canada
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Hello all, long time no see
Curious if any of our commercial oberndorf experts can enlighten me. Are factory offerings in 8x57 all .323 bores? What models were available in these chamberings? Anyone have pictures up show off? Any Canadians interested in selling one?
Thanks,
Conor
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lancaster
.470 member
Reged: 06/05/08
Posts: 9518
Loc: There's a lighthouse in the mi...
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I am no mauser expert but thinking the early ones have I bores. you can only be sure if it stamped "8x57 IS" without measure it.
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Norwegian hunter misses moose, shoots man on toilet
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bringing civilisation to the barbarians
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sharps4590
.333 member
Reged: 09/03/16
Posts: 290
Loc: Missouri Ozarks
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I'm no expert either but I have owned and measured, (slugged), several Mauser sporting rifles, pre-WWI and between the wars. All I have measured we definitely knew were pre-WWI were .318 groove diameter. Those from between the wars could be either .318 or .323. It seems those we were positive were proofed closer to the end of WWI were more likely to be .318 and the closer they got to the beginning of WWII for a proof date, .323 seemed dominant. That's just the experience of one guy and certainly not definitive.
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Jesus said, "I am the way the truth and the life. No one comes to the Father but through me." John14:6
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85lc
.400 member
Reged: 19/01/18
Posts: 1190
Loc: Georgia, USA
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Axel can better discuss this issue.
From what I know, commercial rifles built before WW2 were for 0.318" bullets. Many Mauser rifles were had a tapered bore (first 3cm or so) so that a 0.323" bullet could be fired in the rifle without a problem. The bullet would swage down in the taper.
I have a 1937 double rifle that is 0.323" at the chamber but tapers to 0.318" in about 3 cm. The prior owner shot 8x57SR. I shoot 8x57IR as I don't want to stress the double rifle.
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RB
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Marrakai
.416 member
Reged: 09/01/03
Posts: 3710
Loc: Darwin, Top End of Australia
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Conor:
Plenty of good info from knowledgeable folks, particularly kuduae, in answer to my similar query on this old thread:
Commercial Mauser Bore Codes
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Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au
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Conor_90
.224 member
Reged: 12/01/18
Posts: 45
Loc: Canada
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Thanks for the responses guys, looking at one with a n bore. Curious if anyone has reloaded for these and how it affects the brass life?
Quite a good deal on a 9x57 by the same seller, can't say it's not tempting but I am far from a skilled reloaded and very busy having returned to school in my 30s
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Marrakai
.416 member
Reged: 09/01/03
Posts: 3710
Loc: Darwin, Top End of Australia
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Quote:
Curious if anyone has reloaded for these and how it affects the brass life?
I have reloaded PPU 8x57 brass many times for use in the Walter Locke & Co Type B Mauser referred to in the older thread.
Pressure is modest, and the brass is kept specific to the rifle so I neck-size only.
Because I use .323 projectiles and the rifle is throated accordingly, there is absolutely no issue.
All good! 
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Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au
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yamoon
.275 member
Reged: 19/06/22
Posts: 97
Loc: Kansas USA
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I have an Orberndorf B 8x57 proofed in 1912, the bore slugs .321, a .323 bullet slips easily in a fired case, so I just shoot factory 8x57 ammo.
Mike
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Mike
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DarylS
.700 member
Reged: 10/08/05
Posts: 27701
Loc: Beautiful British Columbia, Ca...
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That's the ticket. If a .323" bullet will enter a case neck of a ctg fired in THAT rifle it is safe to use IS ".323" bullets in that rifle.
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Daryl
"a gun without hammers is like a Spaniel without ears" King George V
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