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Thread: Barrel fowling and accuracy & accuracy testing WOW

  1. #11
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    I might be talking out my ass here, but I'd believe it's from the copper fouling filling in any rough/imperfect surfaces within the bore, thus creating a smoother, more precise, more consistent surface for subsequent shots.

  2. #12
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    Quote Originally Posted by Littlelebowski View Post
    Clean barrels don't shoot as well as fouled barrels.
    That's a fact. And when you change powders, it's a good idea to clean the barrel and foul it again.
    Train 2 Win

  3. #13
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    Quote Originally Posted by Magic_Salad0892 View Post
    In my experience this is true, but why is that?
    In my understanding, there is a little bit of what DreadPirateMoyer offered, plus any remnant cleaning solution left in places where it is impossible to remove would be, in effect, a contaminate that must be completely scoured out of the bored by shooting through it before it settles into some degree of consistency needed for accuracy.


    MikeN

  4. #14
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    Quote Originally Posted by DreadPirateMoyer View Post
    I might be talking out my ass here, but I'd believe it's from the copper fouling filling in any rough/imperfect surfaces within the bore, thus creating a smoother, more precise, more consistent surface for subsequent shots.
    Yea, thats my understanding. Hodnett goes over this quite a bit and offers several interesting examples in the Long Range Magpull video.

    I just clean the carbon out most of the time to keep the perfect smooth bore perfecto. I leave some copper in because Im lazy even when I use copper remover. Mark will do a full on copper removal more often, and he still hold .5moa in his 308.

    It only makes sense that if your gun is a half inch gun out of the box, you could remove the copper and still have a half inch gun. But some guns definitely improve. My 5R 300 win mag. Went from a MOA gun to a half MOA gun, I suspect this same phenomena.
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  5. #15
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    Wow! unique is the word...

    I've never seen anything like that with quality guns and loads. Minor differences, yes, but never from scattergun to sub-MOA.

  6. #16
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    Moyer, MJN9, and Pappabear:

    Thanks for the explanation. I appreciate it.
    We miss you, AC.
    We miss you, ToddG.

  7. #17
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    Some years ago I noticed that sometimes changing from one batch of hand loads to another with a different powder and the same bullet, a load that had shot well patterned like a shot gun until x number of rounds had gone down the pipe. Seems like some powders do not like to follow others.
    I did find a chart of which powders can follow others and which can’t without cleaning but it seems to have gone into hiding.
    This link http://www.usrifleteams.com/forums/i...howtopic=20489 has a chart that was compiled from folks experience (post #27) of which combinations work and which don’t. Perhaps this will help, perhaps not.

    BV

  8. #18
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    My guns usually shoot best when birds have been inside the barrel too!
    Last edited by Ironman8; 05-20-13 at 14:52.

  9. #19
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    Quote Originally Posted by DreadPirateMoyer View Post
    I might be talking out my ass here, but I'd believe it's from the copper fouling filling in any rough/imperfect surfaces within the bore, thus creating a smoother, more precise, more consistent surface for subsequent shots.
    Sorry but no, carbon and soot filling those imperfections yes. Any copper present in the bore will strip more from the bullet and accuracy goes out the window.
    Carbon fills the imperfections and seals any gaps between the bullet and bore. It protects the bullets from the dry, clean bore and if the bore is a little larger than it should be it tightens things up so the bullet doesn't wobble. Top of land to top of land should be .218". A .218 inspection pin should slide through the bore with a very little resistance. A .219 pin should not fit in the bore at all but I'll bet a .219 will fit in the muzzle apx 3/4" deep in most .224 barrels.
    Soot tightens the muzzle play, accuracy improves.
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  10. #20
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    Any evidence on that outside of personal experience?

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