Convert my Thunder Ranch to 6.8 SPC

Discussion in 'Mossberg MVP Rifle General Discussion' started by rflemann, Dec 25, 2016.

  1. rflemann New Member

    Member Since:
    Dec 24, 2016
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    I am considering converting my Thunder Ranch to 6.8 SPC. I assume all I need is to buy a barrel and have it installed and have the bolt face opened up to accept the larger case.

    Does anyone have recommendations for whom to contact for the barrel and work to be done?

    Am I missing anything here or are there any possible problems or risks I may have?

    Thanks!
  2. boostless Active Member

    Member Since:
    May 5, 2014
    Message Count:
    191
    Honestly I would talk to who you are having make the barrel or a reputable gunsmith. In my mind it should be just as simple as opening up the bolt face and screwing on the barrel but there may be something that could be over looked. I have heard of people just opening up the bolt face in order to do it. I believe it was on 68forums.com so you could head over there and see if they may have advice on the build since they are dedicated to the cartridge.
  3. wood chucker Moderator

    Member Since:
    Dec 19, 2012
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    I'm going to push you towards X-ring. He's kind of a savant with the precision stuff knows the MVP inside and out.
  4. rflemann New Member

    Member Since:
    Dec 24, 2016
    Message Count:
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    Thanks guys! I like my Thunder Ranch and I want to use it for close deer hunting out to 100 yds suppressed. I already have a couple of 6.8's and I have been reloading for this caliber for years. I have taken several deer with it and the 6.8 works for me. It seems logical to have it converted and just wanted to share the logic behind this project.
  5. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
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    I think you're going to have a minor problem with the extractors breaking when you vigorusly cycle the action if you don't have the receiver notch for the ball detent widened toward the blade side .020". That should let it slide over the rim without binding. Otherwise the bolt face has plenty of meat to carve .022" from the wall and the only thing we need to figure out after that is bolt face thrust which should be in the same region as .223rem.

    For a barrel, you can try calling up Black Hole Weaponry. Don't bother with the website (which is converting to columbiariverarms.com). Ask for JP and tell him what you're wanting to do. I gave them the machinists drawings for the barrel tenon and they're making me a .223 barrel right now for my MVP varmint. They have a 6.8spc reamer already.
  6. rflemann New Member

    Member Since:
    Dec 24, 2016
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    Excellent!!!
    I want to proceed. PM coming.
  7. rflemann New Member

    Member Since:
    Dec 24, 2016
    Message Count:
    4
    "I think you're going to have a minor problem with the extractors breaking when you vigorusly cycle the action if you don't have the receiver notch for the ball detent widened toward the blade side .020". That should let it slide over the rim without binding. Otherwise the bolt face has plenty of meat to carve .022" from the wall and the only thing we need to figure out after that is bolt face thrust which should be in the same region as .223rem"

    You sound like you have more than a little experience with this. I have found the wildcat cartridge .277 Wolverine, it virtually duplicates the 6.8 ballistics, but it is based on the .223 case. Instantly, the above bolt possible problems and machine work non existent. Does anyone have experience and or opinions to a Wolverine conversion on a MVP?
    wood chucker likes this.
  8. wood chucker Moderator

    Member Since:
    Dec 19, 2012
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    Barrel swap to .277 Wolverine sounds like a winner to me.
  9. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    996

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