close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Gunsmithing

Reply

Whats the Proper Way to Measure a Reamers Freebore?

LinkBack Thread Tools Display Modes
  #1  
Unread 05-02-2013, 08:13 AM
Platinum Member
 
Join Date: Feb 2007
Location: Townsend, Montana.
Posts: 8,548
Whats the Proper Way to Measure a Reamers Freebore?

OK, so I have a rifle and want the next one I build to have a little more free-bore. I have a measurement from the case head to the O-give (where the bullet touches the lands) but no reamer specs to know what the current reamer had for free-bore. How do I get a measurement on the current rifle's free-bore so I know what to order for the next reamers free-bore?

Thanks
Jeff
__________________
Reply With Quote
  •   #2  
    Unread 05-02-2013, 09:21 AM
    Platinum Member
     
    Join Date: Jul 2004
    Location: Texas
    Posts: 7,000
    Re: Whats the Proper Way to Measure a Reamers Freebore?

    Quote:
    Originally Posted by Broz View Post
    OK, so I have a rifle and want the next one I build to have a little more free-bore. I have a measurement from the case head to the O-give (where the bullet touches the lands) but no reamer specs to know what the current reamer had for free-bore. How do I get a measurement on the current rifle's free-bore so I know what to order for the next reamers free-bore?

    Thanks
    Jeff

    In your case, I would make a chamber cast of your chamber using Cerrosafe because it will show
    everything even the condition of the lead. Cost about $20.00 bucks.

    Once you make a casting of your chamber it is easy to measure any part of the casting. Just
    be sure to follow the instructions TO THE LETTER.

    It is very hard to measure a reamer and you must be careful what you measure it with because
    most Micrometers anvils are very hard and can damage a fine reamer.

    Have you have tried the maker to see is he has the reamer print for it ?

    PS: If the barrel and chamber are good you can buy a throating reamer and do what ever to the
    free bore you want. In fact this is a good way to experiment with throat/free bore length using
    the old barrel before you re_barrel with a new barrel

    I hope this helps

    J E CUSTOM
    __________________
    "PRESS ON"
    Reply With Quote

      #3  
    Unread 05-02-2013, 09:47 AM
    Platinum Member
     
    Join Date: Feb 2007
    Location: Townsend, Montana.
    Posts: 8,548
    Re: Whats the Proper Way to Measure a Reamers Freebore?

    My rifle I have now I ain't doing anything too. It is great, but I am building a new rifle and want to add just a little free-bore. I can't get specs on the reamer used on my rifle so I don't know what to look for or order for a free-bore spec. I can guess that my rifle was done with a PT&G "Tactical Match" reamer, says on barrel (300 win Tactical Match) but it is only a guess. I know where the O-give was in my rifle when new, I have all that documented. Just don't know what a reamer maker would call it for free-bore. ??

    Thanks
    Jeff
    __________________
    Reply With Quote
      #4  
    Unread 05-02-2013, 11:24 AM
    Platinum Member
     
    Join Date: Oct 2008
    Location: Boise, ID
    Posts: 1,420
    Re: Whats the Proper Way to Measure a Reamers Freebore?

    Jeff,

    You can send in a dummy case with how you want it rather than specifying a numerical length. That way they can measure it for their purposes. I've done that numerous times.

    Nathan
    Reply With Quote
      #5  
    Unread 05-04-2013, 11:23 PM
    Platinum Member
     
    Join Date: Feb 2007
    Location: Townsend, Montana.
    Posts: 8,548
    Re: Whats the Proper Way to Measure a Reamers Freebore?

    Quote:
    Originally Posted by IdahoCTD View Post
    Jeff,

    You can send in a dummy case with how you want it rather than specifying a numerical length. That way they can measure it for their purposes. I've done that numerous times.

    Nathan
    Thanks Nathan, Yes I have done this too. I was just wanting to learn how they come up with their "free bore" measurements. Then I could know what "in stock" reamers will work when and if I do find one in stock. Right now the wait times for a custom grind are unbearable.

    jeff
    __________________
    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes



    All times are GMT -5. The time now is 02:43 PM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC