Remington Pump rifle in 8x57 Mauser?

[bcraig]

I know the standard chamberings are fine BUT I like the 8x57JS mauser cartridge. My favorite bolt rifle is in this chambering and I do reload for the caliber. I asked this question on another forum and was told that it would not be possible to clean up the chamber for a rebore. So I suppose it would have to be a rebarrel . how difficult would this be to do ? Would the magazine have to be reworked,bolt face changed etc? I am not looking to spend a lot of money to have this done OR do myself(IF I can)
Would really appreciate information on how to do this.Thanks,Craig

[336SC]

I would think it is feasible but maybe a little costly.  Start with a .308 chambered 760 or 7600.  Since the 8mm case is longer the .308 Winchester chamber can be rechambered and the barrel rebored.  Good luck with your project if you decide to go ahead with it.  I have
a 760 pump that started life as a .35 Remington carbine in 1979.  It was rechambered to .358 Win and no other modifications were neccessary.  I drive either the Hornady or Remington RN bullet at 2400fps and the smackdown on deer has to be seen to be believed.  I also have a 7600 pump in .35 Remington.  It is a limited run
of 300 pieces distributed by Grice Gun Shop in Clearfield, PA.  I also have a limited run 7600 in .300 Savage which
is also 1 of 300 pieces produced.  I used the 7600 in .35 Remington last deer seasone (2010) to bag a nice big
doe.  I used the HDY FTX 200gr Gummie tip witha +P+ load pushing it to 2404fps.  I shot her at 97 yards and she was DRT.  That gummie tip hit her with over 2000ft/lbs of energy and held together for a 1 1/2" exit hole and
severe damage to heart and lungs.
336SC

[bcraig]

thanks for the info but I dont think that will work. yes the 8mm Mauser is longer but I think that the Mauser round has a different diameter and taper that is smaller than than the 308 which is why the chamber wont clean up as pointed out to me by others on another forum.This makes me think that the rifle would need to be rebarreled. Anyone know how to do this ?

[Rangr44]

If you can locate a Remington 760 or 7600 chambered in 6mm Remington on gunbroker or gunsamerica, etc,

http://www.gunsinternational.com/Remington-Model-760-Gamemaster-BDL.cfm?gun_id=100165965

the existing barrel can be simply bored out to .323" by Jes or someone, since the 6mm Rem is based on the 8x57, just necked down.


If you already have the rifle, scrounge the online parts sellers, for a 6mm barrel and magazine - the bolt will be OK.
Rebarreling with another Remington barrel is a turnwrench job, except for checking headspace.

.

[336SC]

I'm pretty sure the 8mm Mauser has the same head diameter, .470 as the 30-06, 308, 300 Savage, 6mm, 243,
.358 Win, .35 Whelen, 7x57, ad infinitum.  The 760/7600 uses the same ejection port on both short and long cartridges so no modification is needed there.
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[gunnut69]

With the remington pump the lebth of the cartridge one starts with won't matter all that much. A re-bore is only worthwhile is one needs to maintaion the barrel marks or rebarreling is extraordinarily difficult. The 760 is not all that hard to rebarrel. The hardest part is usually removing the barrel extension from the rear of the barrel. The barrel is removed from the receiver and a wrench is fabricated for the extension. The barrel itself is ensconced in a barrel vice..make it a really good one as they are usually hard to get apart. The replacement barrel is threaded and short chambered and mounted to the extension. Headspacing can be accomplished outside the rifle which is why the short chamber. When everything checks out reassembly should produce a workable rifle.. The attached link shows the barrel extension/barrel disassembled..

http://stevespages.com/ipb-remington-760.html

[Siskiyou]

Have you considered reboring the M760 to the 8MM/06?  Post WWII this was a popular wildcat with the re-chambering of M98 Mauser for the round to take advantage of the ready supply of 30-06 cases.  There are a lot of M760 rifles chambered for the 270 and 30-06 that would make a good donor for such a project.

I realize this is a little out of left field but I have loaded for the M760 for years along with a couple of bolt guns in the same caliber.  I reduce my maximum charge for the M760 about a grain to insure smooth extraction. 

I am not knocking the 8X57, it is a good round and it produced a bear for me.

[bcraig]

Hi guys thanks for the information. I bought a used 7600 from the pawnshop.Reciever probably needs refinishing but i can live with it. The rifle is a 270 with a wood stock.
Issues right off the bat ,the rifle wont feed the 2nd round from the magazine. I have determined the problem is the Magazine as the round is not comming up far enough at the rear for the bolt to pick it upand it appears to be on a teeter totter as i can push the front of the round down slightly and the rear comes up !. I would like to know how to dissamble the magazine? dont know how to take the plastic off the bottom (and I assume its gotta come off)
I know I can buy a new magazine BUT would like to fiddle with this one to see if I can make it work before I do.Also the magazine really acts like it only wants to hold 3 rounds and not 4(it is supposed to hold 4 isn,t it ?)
I really just want the 8mmJS Mauser and not the 8mm -06 so I guess I will have to rebarrel.
Thanks ,Craig

[gunnut69]

I've not dealt with the new mags but the old ones were taken apart thru the top.. The follower is moved down and to the rear, tipped if you will. It is thenscooted forward and rolled back to remove spring.. Working from memory here so forgive the uncertainty CRS syndrom.. If its a short caliber there's filler in there to soak up some of the extra length.  It comes out last.. The spring and follower fit inside it... Yours being a 270 should have nio filler.. Just guessing but shounds like the mag spring is either in backwords or broken..? The link below will give a blow up of a magazine..

http://stevespages.com/ipb-remington-760.html

[Siskiyou]

In my early years with the 760 I purchased an extra magazine and carried it loaded in my pocket.  It did not take long to learn that it became home to gum wrappers, and coins. 

Debris might be the issue and you are on the right track.

[gunnut69]

One could make a good thread just on what's been found the matter with or is contained by magazines.. I've found coins, paper clips, and once a cigaret butt?? Must admit that last one sorta made me wonder?? The best I've seen was a friend hought a Winchester M100 in 243 Win.. It wouldn't feed for nothing, and he knew why he'd made such a great deal on the rifle.. He brought it around and a quick look confirmed my suspicians.. the mag spring had been installed backward.. I took it apart and put it back together and it worked perfectly.. I had to show him the trick and he was ecstatic. The guy he bought it from had trouble and had sold it to him knowing it would then be his problem.. I told him he should just mention the malfeeding issue to the seller and see what his response would be. He quickly pointed out that a deals a deal. Whereapon my friend told him the simplicity of the fix.. and thanked him for a great deal on a good rifle..

[336SC]

An old trick a deceased gunsmith showed me one time with the 760/7600 clips is to file about .003 off the lower
radius on the front of the clip.  That allows the "latch" to get a better purchase on the "small raised teet" on the front of the clip.  Take a look and you'll immediately see what I'm saying.  It's harder to explain than actually do.
If .003 removed doesn't work, take another .001 off at a time till it works.  My rechambered .358 Win 760 used
to not feed after the first round was fired.  The clip actually dropped down a bit and the second round would slam
into the feed ramp instead of travelling up the feed ramp.  A little judicious filing around that lower front radius (just below where the cartridges sit in the magazine and there is a left and right side, the radius is interupted) and all has been fine since.  Hope I made myself understood
because I'm not a good procedure writer.LOL
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[bcraig]

With the remington pump the lebth of the cartridge one starts with won't matter all that much. A re-bore is only worthwhile is one needs to maintaion the barrel marks or rebarreling is extraordinarily difficult. The 760 is not all that hard to rebarrel. The hardest part is usually removing the barrel extension from the rear of the barrel. The barrel is removed from the receiver and a wrench is fabricated for the extension. The barrel itself is ensconced in a barrel vice..make it a really good one as they are usually hard to get apart. The replacement barrel is threaded and short chambered and mounted to the extension. Headspacing can be accomplished outside the rifle which is why the short chamber. When everything checks out reassembly should produce a workable rifle.. The attached link shows the barrel extension/barrel disassembled..

http://stevespages.com/ipb-remington-760.html

Hi,did you get the PM I sent you a few days ago?

[bill439]

any good smith that does barrel work should not have much problem doing this job for you, it just may cost more than what you want to spend.  Bill439