changing caliber of a 270

Discussion in 'Gunsmithing' started by TBuckus, Feb 21, 2014.

  1. TBuckus

    TBuckus Well-Known Member

    Messages:
    174
    Joined:
    Jun 12, 2012
    question on cost to change caliber of my rifle.

    I have a Model 70 .270 that I am toying with the thought of changing it to maybe a 6.5 or 7mm size caliber.
    So if I stay in the same family of 270 cases, is it just the cost of a new barrel, gunsmithing to fit barrel and headspacing?

    The idea of having a 6.5x284 sounds intriguing.
     
  2. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,051
    Joined:
    Dec 20, 2008
    Look at the 1st sticky on this forum that Jerry and others generously shared. lightbulb
     
  3. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,051
    Joined:
    Dec 20, 2008
    It's the bolt face diameter sticky.
     
  4. TBuckus

    TBuckus Well-Known Member

    Messages:
    174
    Joined:
    Jun 12, 2012
    Read that after I posted this. Thanks. Didn't realize that the 6.5/284 is a short action caliber. I'll have to look at those listed calibers and see what I'm interested in.
     
  5. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,051
    Joined:
    Dec 20, 2008
    If you want to stay with .270, why not re-barrel it with either 1:8 or 1:9, chamber it in .270 or AI, or .270 Sherman, push the 165 or 175 Matrix or the soon to be 170 Berger and you got yourself a totally kickazz rifle/chambering.

    For 6.5, do a custom search on the 6.5 Sherman and .280/.280 AI for the 7MM/.284 cal.
     
  6. Garycrow

    Garycrow Well-Known Member

    Messages:
    480
    Joined:
    Jan 30, 2011
    6.5x284 isn't a short action caliber, at least not if you want to shoot long bullets out of it. It's best built on a long action so you can take advantage of the higher BC bullets. The 284 case will fit in a short action but you're very limited by doing so. You could build one on your long action Winchester, it'd work well though it might take some tweaking in the feeding department though I suspect it'd feed fine without any feeding work. The bolt face is the same for it and the .270. An 8 twist barrel chambered in 6.5x284 would be a great use of that action. A new barrel chambered in 6.5x284 fitted to your action would run from $400 on the low end to $700 on the high end. The advantage of a 6.5 or 7mm over a 270 are the vastly improved bullet selection.
     
  7. FEENIX

    FEENIX Well-Known Member

    Messages:
    11,051
    Joined:
    Dec 20, 2008
    I'm pushing the 175 Matrix VLD in my 270 AI out of a 30" Lilja, 1:8, 3-groove at 3000+ FPS (2993 is my accuracy load for the AI at this time with H4831SC and 2919 FPS for .270 Win, also with H4831SC). In comparison, my hunting buddy is pushing a factory 180 Berger VLD (HSM) out of his 7MM Rem Mag in Weatherby Accumark (IIRC, it's a 26" barrel) at 2845 FPS. IMHO, that's not too shabby! :cool:

    The 270 Sherman generates ~100 FPS more than the AI.lightbulb
     
  8. J E Custom

    J E Custom Well-Known Member

    Messages:
    8,334
    Joined:
    Jul 29, 2004

    The 6.5x284 can be used in a short action or a long action.

    The action length in the post is the minimum action length for that cartridge but a longer action
    may be used for all cartridges with some adjustments in the magazine and feed rails.

    Also you can use a short action on longer cartridges that normally use a long action but most of the time you can't eject a loaded round without removing the bolt.

    Hope that clears it up for you so that you can build a 6.5 x 284 if that is what you decide on.

    J E CUSTOM
     
  9. switchback

    switchback Well-Known Member

    Messages:
    450
    Joined:
    Feb 8, 2008
    don't know if your Model 70 is a push feed or control feed. I built a 6.5-284 some years ago on a M70 push feed action that was originally a .270 and it fed fine with no work done on the reciever. 2 more built after mine on the same push feed and both also fed fine. Hope that helps.
     
  10. TBuckus

    TBuckus Well-Known Member

    Messages:
    174
    Joined:
    Jun 12, 2012
    It's a CRF.
    Now the hard part of chosing.