Gunwerks 7mm LRM Reamer

Discussion in 'Gunsmithing' started by victorc, Aug 2, 2013.

  1. victorc

    victorc Member

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    I've purchased a 7mm LRM reamer from Genwerks in hopes of having a rifle put together for me in the same cartridge. I've purchased a Lilja #5 sporter stainless steel fluted 1 in 9 barrel but I've been shown by the gunsmith that the reamer pilot won't even start down the barrel and he's told me the bore is to tight to be worked on. I called Lilja and Dan asked me to send the barrel back to be look at. He sent it back to me and followed up with a call today assuring me the barrel bore was cut and lapped to the proper specifications for a 7mm barrel (.276).

    Is it possible the reamer pilot is incorrectly sized? Any advise would be appreciated.
     
    Last edited: Aug 2, 2013
  2. Black Tail Hunter

    Black Tail Hunter Well-Known Member

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    I'm certainly no expert in this area but it seems to me that if you conatcted gunwerks they should be able to tell you what the diameter of the pilot should be. You could then mic the one you have and see if it is out of spec.
     

  3. Edd

    Edd Well-Known Member

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    One of the reasons to own a reamer with removable pilot bushings is so you can use whatever bushing fits the barrel.

    If your reamer has a removable pilot bushing, you need to contact the manufacturer and order a set of bushings for it.

    If it is a solid pilot reamer, you need to send it to the manufacturer and have it changed to a removable bushing style and order a set or bushings for it.
     
  4. Hired Gun

    Hired Gun Well-Known Member

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    The bushings included with the reamer are only put on there as a courtesy. Your "gunsmith" should know this and just select one from his set that fits. If he is in the business he should have a 9 piece set for every caliber on hand. I have never seen a Lilja that far out of spec.
     
  5. victorc

    victorc Member

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    Hired Gun, are you telling me Dan Lilja is feeding me full of garbage when he's telling me the bore diameter for a 7mm barrel is .276"?
     
  6. HuntFarther

    HuntFarther Well-Known Member

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    The reamers are pacific tool and guage and usually can swap out the bushing on the end.
     
  7. Hired Gun

    Hired Gun Well-Known Member

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    When I say out of spec I mean so far off it can't be used. I use a lot of his barrels and they are all 1/2 moa or better.

    Dan is a straight shooter. A typical 7mm barrel is .2760 bore diameter give or take .0005" and around .284" groove diameter. No two are exactly alike is why we carry multiple reamer bushings for the task. The bushing set for 7mm are:
    .2770 .2768 .2766 .2764 .2762 .2760 .2758 .2756 .2754
     
  8. shortgrass

    shortgrass Well-Known Member

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    How would Gunwerkes know what pilot he needs without having the barrel in hand? Pilots are speced to the barrel. You cannot order a barrel speced to the pilot you happen to have on hand. I'd expect Gunwerkes to use (and sell) reamers that use removable pilots. The problem arises when things are ordered and after they're received the person that ordered it doesn't really know what he has or for that matter, ordered (it happens several times daily for reamer makers, barrel makers, stock makers, anyone who makes or sells components/tools). Your "gunsmith'" should have explained this to you. If he doesn't understand,,, well,,,,,, I'd find someone who does. victorc,, you should have called Gunwerkes about this before bringing to a forum. They'd have explained it to you if your "gunsmith" can't or won't.
     
  9. Dave Kiff

    Dave Kiff Official LRH Sponsor

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    I have seen barrel's range from .2755 to .278 on 7MM / 284 . The CIP ( European ) barrels are the smaller bore .2755 . The average after market Barrel runs .2767 plus or minus . That's why we make .0002 bushing sets and individual .0001 bushings . I sure wish I could guess the size of bore a barrel may have. I make the bore reamers and sell them Thru my company Pacific Tool and Gauge , also Drill Masters, Danjon and a couple of others . We sell them to just about every barrel maker you can think of and I still cant predict a bore size . Most Smiths have invested in bushing sets and if they haven't they should. My .02 cents............ Thanks Dave