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Thread: Patched balls in a fast twist barrel?

  1. #21
    Boolit Master


    dondiego's Avatar
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    Quote Originally Posted by jdfoxinc View Post
    All TCs were 1:48 and shot RB fairly well. A 1:30s would be slightly better.
    Why do you believe that a 1:30 twist would be better for round ball shooting?

  2. #22
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    ShooterAZ's Avatar
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    1/60 twist would be slightly better....

  3. #23
    Boolit Master
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    A "chunk Gun" usually is a percussion or flint lock rifle with a long, large diameter barrel that can be upwards of 2 or 3 inches across the flats. They usually have a tang and globe sight or possibly a scope such as a Unertl. Since they are heavy, even 40 or 50 pounds they are shot from a bench or on a log (chunk) with the shooter prone. In most cases they are hand made with the best hardware you can find such as Douglas XX barrels, Lewis locks and Lewis triggers and Unertl scopes. Because of the rules most have conventional side ignition systems and not an under hammer.

    Do a Google search for the match named after "Alvin York" or the "Bevel Brothers" and you can see what the guns look like.
    John

  4. #24
    Boolit Grand Master

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    I have a 54 T/C Scout with 1/20 twist. It shot RBs with light loads well at 25y but I never have taken in back farther yet to see how it does.
    Aim small, miss small!

  5. #25
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    Quote Originally Posted by dondiego View Post
    Why do you believe that a 1:30 twist would be better for round ball shooting?
    It would be worse, and I think it is true that 1:60 or slower would be better than the quite passable 1:48.

    A conventionally patched round ball, with wrinkles round the edge, is bound to be less concentric with the bore axis than a good cylindro-conical bullet, grooved or paper patched. Eccentricity of mass affects accuracy in two ways. It could induce a wobble or corkscrew motion in flight. but that isn't much of a problem with round ball. It also produces an angular deflection at the muzzle, and this is proportional to the speed of rotation. The best twist is the slowest that will keep the front of the ball at the front.

  6. #26
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    Quote Originally Posted by Ballistics in Scotland View Post
    It would be worse, and I think it is true that 1:60 or slower would be better than the quite passable 1:48.

    A conventionally patched round ball, with wrinkles round the edge, is bound to be less concentric with the bore axis than a good cylindro-conical bullet, grooved or paper patched. Eccentricity of mass affects accuracy in two ways. It could induce a wobble or corkscrew motion in flight. but that isn't much of a problem with round ball. It also produces an angular deflection at the muzzle, and this is proportional to the speed of rotation. The best twist is the slowest that will keep the front of the ball at the front.
    That "quite passable" 1:48 twist still has limitations (with roundball) that the 1:66 does not - that said - 1:48 is a good compromise if the shooter sees a need to experiment with minies or other elongated missiles -----going the other way some slow twist barrels (1:72 etc) seem to need a substantial load to get them to shoot acurately.

  7. #27
    Boolit Master
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    Quote Originally Posted by ShooterAZ View Post
    1/60 twist would be slightly better....
    would be much better I reckon!!!

  8. #28
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    Quote Originally Posted by Canuck Bob View Post
    The rifle is on its way. The twist rate verification will be the first order of business. Outpost I don't get the ratio of 1:40 as an alloy percentage. I also intend to add some tin from a stash of tin solder for the balls. The added castability is worth it and the tin is already paid for. Would 1% be an effective blend?
    Bob
    Tin in roundball is a poinless excercise - dont need it!!
    1) Tin is a much more expensive metal than lead - save your money even if you already paid
    2) softer is better for roundball
    3) I get your castability argument for making boolits - but it has minimal effect casting roundball - roundball is easy!

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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