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  #1  
Old 06-21-2009, 02:45 PM
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7.62 differences


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Hi all! It's been a while since I've been here. got laid off in April & have been working three part time jobs since. Haven't much down time. I have a question about the different 7.62 rounds. What are the differences and can they be shot in any rifle chambered for that round? I'm asking because I recently came upon a Mosin-Nagant chambered for 7.62-54. I don't know what the 54 is but am guessing powder measure. Is this the only ammo that should be used?
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  #2  
Old 06-21-2009, 05:34 PM
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THe 54 is the case length...54mm. The 308 is a 7.62x 51 or 51 mm long. 30-06 is 7.62x 63...63mm long. So the 06 is 1/2" (or 12mm) longer than the 308. The AK round is 7.62x39.

That's one reason you can't chamber them in any other rifle. The other is that the
mosin 7.62x 54 is a rimmed cartridge, I believe.

ALso cartridge diameters are different. I have heard of a german 8x57 being fired in 30-06, but that may be an urban legend.
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  #3  
Old 06-21-2009, 06:13 PM
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Leverite,

Not urban legend. Hatcher reported four of the Springfield receiver failures among the low serial numbers were due to the 8 mm being fired in them by mistake. Kaboom.


Tunnels,

7.62 mm is just the bullet diameter, and that isn't always as consistent as its name. It has nothing to do with the size of the case behind the round or the pressure the round runs at. That's what the 54 is part of describing. So no, they are not interchangeable with others and attempting to interchange them could easily result in damage to your gun. Not to mention yourself. You always need to look on the rifle barrel and whatever cartridge name is there, use that. You can't normally use anything else, though there are a few exceptions. One is that you can usually fire a parent cartridge in a wildcat based on it. The case will expand and will then be the wildcat's case from that moment forward. The other is with straight wall pistol rounds which will let you fire the shorter, lower pressure round they were derived from. For example, shooting a .38 Special in a .357 Magnum. The two cases have identical dimensions except for the magnum case being a little bit longer. The same for the .44 Special in a .44 Magnum chamber.

In the case of your 7.62x54R mm there is no exact case that can be safely fired in it that I am aware of except maybe the 7.62X53 Finnish, Which is slightly smaller in most dimensions and the bullet is also a couple thousandths smaller, so it wouldn't be the most accurate. So you just have to get the right thing.
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Last edited by unclenick; 06-21-2009 at 06:26 PM.
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  #4  
Old 06-21-2009, 07:12 PM
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Thanks for your replies. Obviously the smart thing is to buy ammo that is listed on the barrel. i'm not sure how much I would want to fire it anyway.
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  #5  
Old 06-21-2009, 07:27 PM
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What rifle are you wanting to feed, and what caliber (if any) is marked on it?
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  #6  
Old 06-21-2009, 08:57 PM
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And not all "7.62mm" ammo is even the same actual bullet diameter, either.
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  #7  
Old 06-23-2009, 09:33 AM
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so just to be cautious i have a savage 110 in 7mm. i havent shot in a while cuz i dont bring it on base but i have been buyin ammo online to have when i go home. is there any i shouldent be buying i normally type in 7mm rifle ammo and get 7mm rem mag and some times 7mm x 57????
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  #8  
Old 06-23-2009, 10:43 AM
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7.62 isn't always 7.62. 7.62 as it relates to the .308 and .30-06 means using .308 dia. bullets. 7.62 x 54 for the Nagant or 7.62 x 39 for the AK or SKS variants means using .311 dia. bullets. Shooting a .308 in a 7.62 x 54 or 7.62 x 39 will work, but accuracy would be about as good as throwing a marble down a gas pipe. The 8 x 57 isn't an 8mm at all, but actually a 7.92 - then add the confusion of an 8x57J or an 8x57JS. One will shoot .318, the other shoots a ,323 dia bullet. If in doubt, slug the bore. Older mil-surp rifles that have seen considerable use, rough handling, possible modifications, or questionable age and origin should all be slugged and chamber casts made for the sake of safety. For the Savage 110 in 7mm is that a 7mm Rem Mag, 7x57 - check the barrel stamping and order appropriately. Worst case is one won't chamber at all, or the other is a blown case in the chamber.
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Old 06-23-2009, 10:48 AM
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7mm what? There are several (as well as .280/.284). You should 'type in' whatever is on the side of the barrel of your rifle. A 7mm Rem Mag is definitely not the same as 7x57. Your responses remind me of Fletch... when asked what his home address was, he replied "Seven." It doesn't tell you much without more information (like street and city names and zipcode).

I'm afraid that you may be headed for disappointment, at the least, and potentially harm, at the worst, by chambering the wrong cartridge into your rifle. You must make sure the cartridges you buy/use are what is marked on your barrel. If there are no markings, you should take the rifle to a gunsmith to figure out.

7mm or 7.62 is not enough information to determine what cartridge you should be using in your rifle as bullets of those diameters are used with a variety of cases to form various types of rifle cartridge. For example, look at this page: http://www.midwayusa.com/browse/Brow...yString=653*** which contains a listing of lots of rifle cartridges. There are 14 different cartridges that use 7mm bullets (including the .284 and .280), for example. Those cartridges are not interchangable.
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Old 06-23-2009, 05:03 PM
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I wont be home till next week to look at the barrel but i do have a casing ive fired through and on the bottom of that it says "7mm REM MAG W-W super" can i ask what is the diffrence between a rem mag a WSM Win SAUM and all the others?
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  #11  
Old 06-23-2009, 05:08 PM
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im reading a artical i found which explains a little. Is it mainly the size of the rounds?
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  #12  
Old 06-23-2009, 05:33 PM
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the main difference in all of the ones you mentioned is the shape of their brass and corresponding chamber. those differences, even if minute, make it unsafe to try and fire a non-matching one in the incorrect chamber.

advntrjnky
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  #13  
Old 06-23-2009, 05:59 PM
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ty that will be a big help! actually in what factor of building a rifle would this come into play? selecting the action im assuming?
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  #14  
Old 06-23-2009, 06:52 PM
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Ammoguide http://ammoguide.com/ is a good site for comparing cartridges. Comparing the dimensions of the 7mm Remington Magnum and the 7mm Remington SAUM (Short Action Ultra Magnum) shows that the SAUM is too fat for the Magnum's chamber and the Magnum is too long for the SAUM's chamber. Which is a good thing.

7mm Remington Magnum: http://ammoguide.com/?catid=13

7mm Remington SAUM: http://ammoguide.com/?catid=235

Bye
Jack
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  #15  
Old 06-23-2009, 07:04 PM
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Quote:
Originally Posted by hue001t View Post
I wont be home till next week to look at the barrel but i do have a casing ive fired through and on the bottom of that it says "7mm REM MAG W-W super" can i ask what is the diffrence between a rem mag a WSM Win SAUM and all the others?

They have different case dimensions (shapes), and different powder capacities. As a rule of thumb, NEVER put a cartridge into a gun unless it is labeled exactly the same as the barrel of the gun. In other words, if the barrel of your rifle says 7MM REM MAG , any ammo you put in to it should say the same.
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  #16  
Old 07-04-2009, 06:11 PM
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7.62 vs 7.62

There are any number of "7.62" rounds. 7.62mm = 0.30" exactly, so there are 30-06, 30-30 as well that could be referred to as 7.62. Just remember that an Eastern Bloc country isn't going to make weapons or munitions that can be interchanged with a NATO country's weapons or vice versa. Same goes for the like of Makarov 9mm and 9mm Luger. For a Russian/Eastern Bloc gun, you're gonna need Russian/Eastern Bloc ammo. Trev
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  #17  
Old 07-04-2009, 06:44 PM
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7.62 vs 7.62

Sorry about the duplication. 7.62mm = 0.30" exactly, but .308 is the civilian version. - Trev

Last edited by trev; 07-04-2009 at 06:47 PM.
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