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  • Warpspasm

    Ultimate Member
    Aug 2, 2010
    1,771
    Harford, Co.
    I just measured my barrel and it appears I must have one of the early Great Plains Rifles because it measures 33 inches. Is that a good thing?
     

    iH8DemLibz

    When All Else Fails.
    Apr 1, 2013
    25,396
    Libtardistan
    Use a cleaning rod and tight patch to determine twist rate.

    Make a mark on the cleaning rod and push it into the bore. Allow the friction between the bore and the patch to spin/rotate the rod.

    If the rod makes a full rotation in 33 inches, you have a 1:33 twist rate. Here's were things can turn into another 3% thread.....A half rotation in 33 inches will be a 1:66 twist rate.

    You can use this trick and a little bit of math to get you in the ballpark.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,733
    Socialist State of Maryland
    I just measured my barrel and it appears I must have one of the early Great Plains Rifles because it measures 33 inches. Is that a good thing?

    In my experience, a 1 in 66 twist is excellent for a .50 caliber patch ball. Since I have never shot the GPR with a 1 in 60 twist, I don't know how much of a difference there is.

    I do know that my 33 inch .50 cal GPR Flintlock will put five balls into one ragged hole about the size of a quarter at 50 yards from the bench with a .490 ball, .015 patch, my own patch lube, a felt wad and 60 grains of Swiss 2 F powder. That's with the existing open sights that came with it.

    I have built about 14 front stuffers over the years and have owned many more. For the money, the Lyman GPR is the most accurate I have seen for a production rifle.
     

    Warpspasm

    Ultimate Member
    Aug 2, 2010
    1,771
    Harford, Co.
    In my experience, a 1 in 66 twist is excellent for a .50 caliber patch ball. Since I have never shot the GPR with a 1 in 60 twist, I don't know how much of a difference there is.

    I do know that my 33 inch .50 cal GPR Flintlock will put five balls into one ragged hole about the size of a quarter at 50 yards from the bench with a .490 ball, .015 patch, my own patch lube, a felt wad and 60 grains of Swiss 2 F powder. That's with the existing open sights that came with it.

    I have built about 14 front stuffers over the years and have owned many more. For the money, the Lyman GPR is the most accurate I have seen for a production rifle.

    I'm new to this BP stuff, so please explain when the wad goes in. I've shot BP revolvers and the wad goes between the powder and the ball.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,733
    Socialist State of Maryland
    You don't really need a wad in a patch ball rifle but in some it gives better accuracy as it protects the patch. I place the unlubricated wad over the powder on the guns I use wad in. One thing that Investarm barrels are known for is cutting patches when the barrel is new. It usually takes about 200 rounds before they stop cutting patches. I suggest that you look for your patches at around 10 to 15 feet in front of your muzzle so you can see if they are cutting. This happens because the lands are very sharp from the factory.
     

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