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Thread: Barrel Twist ???

  1. #1

    Barrel Twist ???

    How can I check the twist of a Barrel

  2. #2
    Banned
    Join Date
    Mar 2015
    Location
    Boncarbo,Colorado
    Posts
    706
    On a Clean Barrel, push a snug Oiled Patched Jag in to the breech.
    Take a piece of electrical tape or masking tape & tape around the rod at the muzzle, bring the two edges of the tape up & pinch together, making a Flag at the 12 o’clock position.

    Now slowly pull the rod out (letting the rod rotate) til the flag is exactly at 3 o’clock position.
    Measure the distance from the muzzle up to the Flag.

    If you pulled it out 12″, take the 12″ times the 4 (as you did 1/4th rotation) = 48, you have a 1 in 48 twist.

    If it came out 15″, 15 x 4 = 60, you have a 1-60 twist.

    16.5″ is a 1-66 twist

    17.5 is a 1-70 twist.

  3. #3
    Boolit Master pietro's Avatar
    Join Date
    Mar 2008
    Location
    New England
    Posts
    3,653
    .

    Some muzzleloading barrel makers stamp the twist rate into the barrel somewhere - usually in the underside of the barrel, where it isn't visible when the barrel's seated in the stock.

    (K.I.S.S. principle )

    .
    Experience is a wonderful thing - It lets you recognize a mistake, when you make it again.

  4. #4
    Boolit Master
    Join Date
    May 2010
    Location
    Chula Vista, CA
    Posts
    1,011
    The above post is pretty spot on with checking. My addition would be to mark a line down the middle of the cleaning rod then mark 1 inch lines all along it. I ended up using my "measuring rod" just for twist rate checking. Note if something looks a little strange you could have a gain twist barrel. I that case you would have to measure from both ends usually causing you to pull the breech plug and go both ways. For example I have a Ron Smith barrel that has 1 in 20 at the breech and 1 in 12 at the muzzle and until I checked both ways that drove me crazy! Make sure to have a tight patch and pull carefully insuring the rod turns easily.
    John

  5. #5
    Boolit Buddy

    Buzzard II's Avatar
    Join Date
    Nov 2011
    Location
    Northern New Jersey
    Posts
    398
    Quote Originally Posted by FrontierMuzzleloading View Post
    On a Clean Barrel, push a snug Oiled Patched Jag in to the breech.
    Take a piece of electrical tape or masking tape & tape around the rod at the muzzle, bring the two edges of the tape up & pinch together, making a Flag at the 12 o’clock position.

    Now slowly pull the rod out (letting the rod rotate) til the flag is exactly at 3 o’clock position.
    Measure the distance from the muzzle up to the Flag.

    If you pulled it out 12″, take the 12″ times the 4 (as you did 1/4th rotation) = 48, you have a 1 in 48 twist.

    If it came out 15″, 15 x 4 = 60, you have a 1-60 twist.

    16.5″ is a 1-66 twist

    17.5 is a 1-70 twist.
    FrontierMuzzleloading,
    Thanks for the great info. You have made it easy and I'm sure there will be some happy people out there!
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check