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 Post subject: .323 or .318?
PostPosted: Sat Jun 25, 2011 11:54 am 
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I just read that the older Mauser bores are made for .323 bullets, but that sometime later they changed to .318.

So, if this it true, then modern 8mm Mauser bullets will be a little lose. That would affect accuracy a bit, wouldn't it? Also, how can I tell which size bore I have?

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 2:24 pm 
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Finding a .318 bore today would be rare to say the least,and the seller would be asking a collectors price. your Yugo will be .323.

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 3:25 pm 
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Thanks Rapidrob.

I sure as heck wouldn't want to shoot a .323 bullet through a .318 bore.

A thing like that could ruin your whole day.

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Last edited by Alden on Sat Jun 25, 2011 4:48 pm, edited 1 time in total.

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 4:11 pm 
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I think the 8x56R for STYER M95 bore is measure at .323 if i remember correctly......

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 4:26 pm 
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Here are 8mm rifle calibers in a comparative nutshell:

8x50R Lebel = .323 inch

8x50R Mannlicher = .323 for the Steyr Straight-Pull rifles.

8x57J Mauser = .318 inch (Adopted 1888 for the 1888 Commission Rifle)

8x57JS Mauser = .323 inch (Adopted in 1905 for the revised GEW 98 Rifle) Many of the GEW 88 and most if not all City GEW-98s (but not all) were updated in different ways for this cartridge. The Swiss Guards of Vatican City stuck with 8x57J for thier GEW-98s.

8x56R Austrian/Hungarian = .329-330 inch Post war update (1931) of the Steyr M-95 by Hirtenberger/Roth and the Austrian Govt. Also adopted by Hungary.

Can anyone can chime in with the Danish/Norwegian/Swedish 8mm numbers?

What diameter did 8mm Murata (Japan) use?

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 8:57 pm 
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It is most likely .318. You could always slug your bore to know for certain. It's fairly easy and there are several "how too" on u tube. Most Mosin Nagants are .311 - .313 not .308 slugging the bore is the best way to know for sure. If you reload this would help accuracy.
Ralph

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 10:11 pm 
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I run .323 in my swedish rolling block in 8mm danish krag as well as in my 8mm kropatchek.

You had the progression backwards, originally they were .318, then were changed to .323. Always best to slug your bore by driving a lead round ball or similar and measuring it. However as Rob says original german .318 bore rifles are pretty uncommon.

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 Post subject: Re: .323 or .318?
PostPosted: Sat Jun 25, 2011 10:39 pm 
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burkfj got it right. The .318" bore came first. Due to errosion issues, the bore was enlarged to make the lands taller/bigger at the same time the bullet was enlarged too. This change took place prior to WW1. During WW1, the Germans couldn't make rifles fast enough, so they took many older .318 bore rifles and issued them to troops after first lengthening the throat so that the larger bullet could be squeezed down safely by the smaller bore.
Many builders of custom rifles considered the .318 bore to be more accurate, so they would often make custom sporters with .318 bores.


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 Post subject: Re: .323 or .318?
PostPosted: Mon Jun 27, 2011 6:35 pm 
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Additionally, German Gun Laws during the Weimar Period prohibited the use of Military Calibers in Sporting Guns. That is why you sometimes find 8x60mm Rifles (8x57JS with a reamer run through it to make it longer) and 98 Mauser Sporters that used 8x57 J (.318) diameter barrels in sporters. Slug first! All post WW1 8mm Caliber Mauser 98 Military rifles in thier original condition used .323 diameter bullets. FN, CZ, Steyr and other Mauser assemblers in Europe all standardized on the 8x57JS. Again slug if you have any lingering uncertainty.

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