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Green Mountain barrel for Lyman Trade Rifle...15/16 or 1in??

Discussion in 'Blackpowder' started by CA2005, May 15, 2006.

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  1. CA2005

    CA2005 Member

    Joined:
    Jun 13, 2005
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    Location:
    TX
    I'm about to order a 1/70 twist Green Mountain barrel for my .50 Cal Lyman Trade Rifle. Do I need a 15/16 or 1 inch? Not even sure what these sizes refer to...

    Any help appreciated.
     
  2. Mercerlake

    Mercerlake Member

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    May 2, 2006
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    Location:
    Oregon coast
    The Green Mountain barrels are fine shooters, can't go wrong there. The figures; 15/16ths and 1" refer to the outside diameter of the barrel measured across the flats. The 1 in 70 refers to the rate of twist of the rifling, one complete revolution in 70". With this twist you will be restricted to a patched round ball as it will not stabilize a conical or sabot/bullet combination. Have fun!
     
  3. chrisbob

    chrisbob Member

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    Feb 14, 2006
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    Location:
    Indiana
    Green Mountain barrels are nice, but I suggest you take it to a reputable smith before you experiment! You can not be to carefull with firearms. If it doesn't fit can you get your money back.
     
  4. sundance44s

    sundance44s Member

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    sundance44s

    You really don`t have a choice on the 1 inch vs. the 15/16 ...like already said you need to measure across the flats on the muzzle end of your barrel .. and order the like ... which ever your stock is bedded for will fit , its not interchangable .. i ordered a greenmountain for my Thompson Hawken ..and i have the 1inch barrel .. the green mountain only comes in a 32 inch lenght and in the 1 inch ... its a tank barrel way too heavy for my likein so i cut 4 inches off it , and it still shoots like a tack driver at 100 yards ...
     
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