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At what velocity does leading occur...Caliber specific?

Discussion in 'Handloading and Reloading' started by goathollow, Dec 10, 2012.

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  1. goathollow

    goathollow Member

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    Up to what velocity can you shoot cast lead bullets before leading occurs?
     
  2. 243winxb

    243winxb Member

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    2200 fps
     
  3. bluetopper

    bluetopper Member

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    Depends upon bullet fit in the barrel, bullet hardness, and if the bullet is gas checked or not.......among other variables I would imagine.

    I have shot 350gr 500 S&W Mag hard cast gas check bullets at just under 2200fps with no leading whatsoever.
     
  4. Arkansas Paul

    Arkansas Paul Member

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    Yep. There's no set in stone number. There are several variables at play. In addition to the ones parasite listed, proper lubrication could also play a factor. I'm sure there's more.

    I think that too hard a bullet at too low a velocity can produce leading as well. Someone correct me if I'm wrong on that, but I think I read that on the castboolits site.
     
  5. zxcvbob

    zxcvbob Member

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    It depends on the gun. I have a Ruger Blackhawk in .30 Carbine that I've shot plain-based cast bullets at over 1700 fps without leading -- it's hard to believe. OTOH I have a Taurus Gaucho .357 that leads badly with everything, .357 or .38 Special. (I should fire-lap the Taurus; it couldn't hurt anything)
     
  6. DeadFlies

    DeadFlies Member

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    It depends on the hardness of the bullets, its fit into the barrel and the pressure (NOT velocity) it is being subjected to. Lee goes on at great length about this in Modern Reloading.
     
  7. ranger335v

    ranger335v Member

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    I've never tested such an idea but I'm quite sure we can get leading if we slowly push an improper bullet down any caliber bore with a ramrod.
     
  8. Sam1911

    Sam1911 Moderator

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  9. Duckdog

    Duckdog Member

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    I think Lee hit the nail on the head in regards to pressure, not hardness. I have messed with his loads and formulas and they seem to be pretty good.

    As said, there is nothing set in stone. Makes it fun.
     
  10. bds

    bds Member

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    There are many factors that contribute to leading - http://www.lasc.us/Fryxell_Book_Chapter_7_Leading.htm

     
  11. goathollow

    goathollow Member

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    Well that pretty well covers it, thanks!

    What I failed to mention is I am shooting a .460 out of a 20" barrel encore rifle. I'm not sure it's worth the time, effort or cost to find a cast lead load that will run slow enough to not lead up the barrel. I can just stick with jacketed bullets and shoot something else for fun.
     
  12. Sam1911

    Sam1911 Moderator

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    .460 will prove a challenge if you're sticking to "true" .460 loads. You certainly could use Trail Boss to make a load for a big 350+ grain lead bullet that wouldn't lead, or use any number of .45 Colt loads, but those are all pretty reduced compared to the real magnum charges.

    But, they'd be a whole lot of fun to shoot and plenty for deer hunting or other light-duty uses.
     
  13. evan price

    evan price Member

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    It depends. Bullet size versus true bore size versus forcing cone size. Lube choice. Hardness (or softness) of the alloy. Powder burn temperature. Style of rifling. Smoothness of barrel, forcing cone and leade. Crimp style and amount.

    You can have one gun that shoots cast perfect then put that exact same bullet in an identical gun and get leading.
     
  14. homatok

    homatok Member

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    For the large calibers, I would: slug the bore, size the cast bullet to 0.001/0.0015 larger than bore size and use an alloy of 50/50 wheel weights and pure lead. I would heat treat or water drop the bullets out of the mould and then do a lot of reading, following which i would choose an appropriate powder and start low and work up. Bullet FIT IS KING! Have fun.
     
  15. bluetopper

    bluetopper Member

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    I'll just say.......I shoot cast lead bullets in all my handguns and one rifle and get no leading whatsoever. From 38 Spl, 357 Mag, 9mm, 44 Magnum, 45acp, and a 500 S&W Magnum rifle.
     
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