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Thread: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

  1. #1
    Marksman Camp Cook's Avatar
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    .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Once again I have been thinking about what cartridge could work in my XCR-L that would complete it as an all round hunt anything rifle and I have finally found a larger cartridge that all RA would need to supply is a barrel the cartridge uses a 7.62X39 bolt that RA already sells...

    The .50 Beowulf is manufactured by Alexander Arms (also responsible for the 6.5 mm Grendel). It measures 12.5 x 42 RB and has an 11.2 mm diameter rim with a 13.5 mm body. Two bullets are offered; the 325 grain hollow-point and the 400 grain flat-nosed soft point. Muzzle velocities achieved with these bullets are respectively 1,950 fps and 1,800 fps from a 16 inch barrel, or 2,050 and 1,900 fps from a 24 inch barrel. Remaining velocities at 200 yards from the 24 inch barrel are 1,210 fps (325 grain) and 1,280 fps (400 grain).

    The magazine is a slightly modified standard 5.56 mm M16 magazine, and larger capacity magazines can be used with the Beowulf by carefully bending the feed lips to reliably feed the larger cartridge. Twelve of the .50 calibre cartridges can fit into a 30-round M16 magazine.



    From left to right: 5.56x45, .458 SOCOM, .50 Beowulf, .499 LWR


  2. #2
    Marksman Camp Cook's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    I just checked Starline Brass they have stock on the brass its pricey though 250 - $182.00... :eyesclosed:

    and here are some of the bullets that I would load for most of my hunting/shooting...

    Hornady
    50 Cal .500 300 gr FTX
    50 AE .500 300 gr XTP

    Jae-Bok Young hard cast
    385gr WLNGC

    Cast Performance
    350gr & 435gr WFNGC's

  3. #3
    Expert Carpenter's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    I think that "tick" is after this caliber too. Pretty badass if you can get it together. Look at "Custom barrels" a few threads down. Also, i have seen AA Beowulf barrels on gunbroker too....
    hope for the best, prepare for the worst, and make hay while the sun shines!

  4. #4
    XCR Guru MickeyC's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    That assumes the bolt design is strong enough. RA has been having huge trouble with the 6.5 Grendel.
    Semper in excremento sum, solum profunditas mutat. 'Always in the shit, only the depth varies'

    The problem with socialism is that you eventually run out of other people's money.... Margaret Thatcher,

    Among the many misdeeds of the British rule in India, history will look upon the act depriving a whole nation of arms as the blackest.
    Mahatma Gandhi

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    Expert Carpenter's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Interestingly, the AA bolt looks the same as a normal AR bolt on the exterior, only thinner walls to accommodate the larger 7.62 case(rim)
    hope for the best, prepare for the worst, and make hay while the sun shines!

  6. #6
    Rifleman shortfal's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Aren't the AR15 rifles in 7.62X39 known for having relatively short bolt lives? Have to wonder how those making large caliber rifles with what is I guess a 7.62X39 bolt keep them together. Perhaps a better grade of steel for bolt and extension? There was an article in Small Arms Review some years back where a guy had a big bore, heavy bullet AR shooting velocities that sounded scarey. He said he was using some secret steel alloy for his bolts. I don't recall anything said about the barrel extensions, but it's been a long time.
    I've got 2 rounds I bought at SAR about 4 or 5 years ago. They are marked LWR .499. The cases are virtually identical to a .50 Beowolf except are about .100 longer. I remember a video the guy was running with these rounds being fired from an AR.
    Curious re the post about RA having "huge trouble" with the 6.5 Grendel. Bolt durability?? Examining the RA bolt it looks like the lugs are well backed up but the actual contact area with the extension looks to be small. Guys have reported large round counts out of their XCR's so I suppose the locking area is adequate for the 5.56 and 7.62 or we probably would have heard. DUNNO about the bolt thrust of those big fat heavy bullet cartridges though.
    Interesting stuff!
    Pete


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    Rifleman RobertSlaughter's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Quote Originally Posted by MickeyC View Post
    That assumes the bolt design is strong enough. RA has been having huge trouble with the 6.5 Grendel.
    To me the rank-beginner, it seems odd that an XCR-L (or any rifle) can handle 6.8 SPC but not 6.5G (or whatever the .2XX version is). I'm an ignoramus, so educate me, please.

  8. #8
    Marksman Camp Cook's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    As I understand it straight walled cases (50 Beowulf) do not have as much rearward bolt thrust as tapered cases (7.62X39) so I feel that their shouldn't be any issues with bolt thrust with the .50 Beowulf and all that is needed will be a barrel and 7.62X39 bolt.

    Here is a part of an article I found on the net comparing bolt thrust.

    http://www.realguns.com/Commentary/comar137.htm

    The 50 Beowulf is an exercise in creative problem solving. A Mil-Spec M-15 will not feed and/or cycle a 0.224 caliber cartridge with an overall length greater than 2.260", the length of a 5.56x45 round. The 50 Beowulf has a maximum overall length of 2.250". No doubt the 0.010" less is to accommodate the loaded round extraction/ejection arc of the larger .500" diameter bullet. Without getting into a debate over what constitutes case head thrust surface area, in relative terms the 5.56x45 generates approximately 4,200 PSI of bolt thrust. The 50 Beowulf with its low operating pressure, tiny rebated 0.445" rim and internally tapered case head generates approximately 4,400 PSI of bolt thrust, and the case design has an additional thrust reducing benefit. Where bottle neck cases are driven against a breech face on discharge, straight cases tend to grip chamber walls and resist rearward motion.

  9. #9
    Marksman hoppes-no9's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Wow, a 400gr bullet at 1,800fps ??!?!

    My elk loads for the Marlin lever action .45-70 (350gr at 1850fps, 405gr at 1,750fps) knock the living snot out of you from the bench. Maybe the gas action on the XCR, and the fact that it's a bit heavier than the Marlin, will help tame the recoil. But part of me wonders whether the XCR can take sustained use of such a load.

  10. #10
    Marksman the tick's Avatar
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    Re: .50 Beowulf will work in an XCR-L uses a 7.62X39 Bolt

    Yeah, that is a project I'm "moving along" with. I'm trying to get ahold of Satern machining for the barrel and receiver work.

    Technically the .50 beowulf is not a straight walled case. Sometimes I wish it was because you'd be able to just use .500 S&W dies.

    The .50 beowulf doesn't generate any harsher conditions on the gun than a 5.56 (well maybe a touch more) and I have not noticed an appreciable difference in wear between my 5.56 and .50 beo ARs. I was initially skepticle but am now a believer.

    The 6.5 Grendel generates quite a bit more pressure....I think...I'm not entirely sure though. Maybe that was causing some problems?

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