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Thread: .500" barrels

  1. #1
    Member homebrew.357's Avatar
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    .500" barrels

    Hi What would be the best twist rate for a 22" .50 cal barrel. I see Marlin and Winchester have a .500" S W M with a 1-24" twist rate so could be ok as they shoot pistol bullets, its a pistol cartridge. The .50 Alaskan is a nasty beast with heaver slugs so could go 1-20" to stabilise heaver slugs. So the question is if I was to make a .5!0" bore barrel for someone's project what twist would you choose.
    Micky Duck likes this.

  2. #2
    Member Micky Duck's Avatar
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    the easiest one to machine......

  3. #3
    Member Walker's Avatar
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    I'd go 1:20, you can still shoot 'lightweight' bullets and big heavy leads.

  4. #4
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    Greenhills Formula will give you the twist calculation for those big bores

  5. #5
    Member homebrew.357's Avatar
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    "Greenhills formula" Aww, think I know, baby food, gotcher, and now all the A R little bangers are being squashed your new projects will have to be big bangers. I mean one 500gr slug will do more damage than a burst A R .223 stuff.Maybe I should knock up a few 25ldr barrels, really get into the heavy stuff.
    Moa Hunter likes this.

  6. #6
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    You would need a bigger lathe

  7. #7
    Member homebrew.357's Avatar
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    I don`t think so, the mere fact that I`m making barrels on a lathe says it all, there is no such thing as "Can't do it" . I have drilled and rifled a .500" barrel, but I Stuffed it up by cutting only six groves, looks crap, so have made a seven grove rifling register disc for the next one, keep looking in F S box.
    Wirehunt, Bill999 and Micky Duck like this.

  8. #8
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    How do you divide a circle by 7?

  9. #9
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    7 Equal part I meant

  10. #10
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    Quote Originally Posted by Friwi View Post
    How do you divide a circle by 7?
    carefully
    Cyclops likes this.

  11. #11
    Member Micky Duck's Avatar
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    thats how hedgehogs have a bonk......

  12. #12
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    360/7=51.4 degrees
    Wirehunt likes this.

  13. #13
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    Or can do it using tec drawing very easy, look it up.

  14. #14
    Member homebrew.357's Avatar
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    I`S not so technical, find a 42 tooth gear and drill a hole every forth one, easy-peasy. Also may be able to fix up the six grove .510" barrel, have made up a new T/C cutter that's 0.133" wide so the lands and groves will be the same, that's .510"x pie / divided by 12 =0.133" . So reset barrel up in lathe and recut rifling then a good polish. It`s still not to the standed .50cal, should be drilled hole =.492", ream to .494" cut rifle 0.003" deep =.500" bore. My drill leaves a hole of .5009", bugger, so has to be for lead bullets only as jacketed ones are .500" dia my bore is .510" =.511/12" bullets. the number 7 rifling disc
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    Micky Duck likes this.

  15. #15
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    thats awesome

 

 

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