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Military Firearm Restoration Corner

Yugo M48 7mm Mag?


rdurrant

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Hello gentlemen, I have a Yugo. M48 in very nice condition. I was toying with the idea of a 7mm mag on this receiver. I know its shorter than the so called standard Mausers. The round just fits into the box mag. but binds ever so slightly. As the rifle is now, the 7mm mag feeds up through the rails with no modification done to it. Not a big surprise to me as Ive seen it before in other Mausers. I know I could make the round feed etc. well enough modifying the rear face of the box mag and installing recoil sholders.

 

My question to you all is; is there anyone that you know of that has done a safe 7mm mag on a Yugo receiver?

 

Ive read posts on this and other sites stating that folks have built the .280 Express Rem. on Yugo receivers with good sucess. The 7mm Mag is .040 OAL shorter than the .280 and other 30.06 based rounds, giving it a little more room in the box mag. I also know the lower locking lug is about .110 shorter than the "standard Mausers".

 

I very interested in hearing your thoughts, pro. or con.

thanks.

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I also know the lower locking lug is about .110 shorter than the "standard Mausers".

 

I very interested in hearing your thoughts, pro. or con.

thanks.

 

I'm not sure what you mean that the lower lug is shorter by .110" the lug on my Yugo measures .140" and on a comercial varriant it measures .135". If it were .110" shorter it would be non-existent. Perhaps I'm misunderstanding you?

 

As to chamberings, if you can get it to fit in the action/mag box and feed then you should have no issues.

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I'm not sure what you mean that the lower lug is shorter by .110" the lug on my Yugo measures .140" and on a comercial varriant it measures .135". If it were .110" shorter it would be non-existent. Perhaps I'm misunderstanding you?

 

As to chamberings, if you can get it to fit in the action/mag box and feed then you should have no issues.

 

Sorry z1r, I should have been more specific.... I ment the length from the front of the locking lug (face) to the rear of it where the ramp begins from the box mag area. Or in other words, the ramp over all length. The hight appears to be the same. Its kind of hard to get good measurements as I dont really have any measuring tools that fit well into the front receiver ring area through the bolt race area. The barrel is still attached.

 

So you feel the receiver is strong enough for the 7mm Mag.?

 

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No worries, just trying to be clear. We often get confussed with termninology.

 

I haven't sectioned a Yugo to compare to a Std 98 but my calibrated eyeball says the the amount of material in the lug webbing (ramp) is the same on both actions. I don't believe the working pressure to be any greater than that of the 7mm-08 and everyone loves to build those on the actions.

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For my general $0.02, The ramp on the M48 is considerably shorter than that of a standard length 98. In general, the ramp of the Intermediate looks like a ramp for a Standard after the magazine has been lengthened and the ramp recontoured. Clear as mud, right?

 

I went to the shop and could only come up with a stripped Standard Length M98 and an M48 that is still in the cosmoline. For that reason, the lighting was less than perfect, but see if you can see the feed ramps in both actions.

 

FeedRamps004.jpg

 

The action on the right is a standard length GEW 98 (1916 Amberg). On the left is an intermediate length M48. The difference that I can see is that the cartridge in the M48 first sees a long, steep angle, then a short, shallow angle. On the Standard action, the cartridge nose sees first a shallow, steep angle and then a long shallow angle. Basically, this is the place where Intermediates seem to be shorter than standards.

 

I would not have a problem with the pressure handling or safety of converting a Yugo to a magnum, but I think you are going to have a very difficult time of it fitting the 7mm Magnum into that particular action. I really don't think a .280 would be very good either. If you are just bound and determined to put a high-powered 7mm cartridge into an intermediate action, the .284 Winchester would fit length-wise, but it could be a bear to make feed. I see your best options as 1) pick a different, more appropriate cartridge (7x57, perhaps?) or 2) find another action.

 

Clemson

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ive been thinking of something along the same lines but in a .308 norma mag on a yugo the only thing thats been holding me back is leanghting the mag box to the rear not wanting to highjack this thread i might start one on that topic as far as strength there has been winchester short mags built on yugos and strength was never an issue with them feeding was the problem i have also seen posts referencing 30-06's built on yugos with no modifications what so ever to mag box and have been wondering if those where really m48s or 24/47s i think they may have actullay been captured std 98s rearsenaled with the yugo comi crest thats just my 2 cents ive measured several times and alway came up a minimum of 1/8" short and usually a 1/4" but i think every one i measured was a 27/47 not sure if theres a difference there

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In my opinion, it is a waste of time to build a magnum on a yugo action when standard length actions are so esy to find still.

 

As to the ramp, I stuck a bolt into the action, turned it over, made a pencil line where the lip of the ramp is and measured from that line to the rear of the bolt lug. No appreciable difference in length. However, you are right that the angle of the ramp is steeper. I can tell you right now that there is more meat in the ramp of my M24 I measured than in the commercial CD action I mentioned. There is considerably more meat in the Std milsurp 98. The CD action is exactly the same as they use for the 7mm Rem mag.

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