Really dirty brass!
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    Really dirty brass!

    Anyone know what could be causing this? Unburned powder or case not resized properly.Name:  IMG_3845.JPG
Views: 63
Size:  1.03 MB

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    Crimp tension, low powder charge, undersized bullets.

    My bet is numbers 1 and 2 without any further information.
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    Quote Originally Posted by jtg452 View Post
    Crimp tension, low powder charge, undersized bullets.

    My bet is numbers 1 and 2 without any further information.
    Thanks.Think you are correct. These were my first attempt at .458 socom reloads. Most of the info I was getting was load with light crimp and start at a very low powder charge.
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    Near zero case expansion. Try upping the powder charge 10 to 15%.

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    Blow back or blow by not sure exactly what you call it. Looks like
    the round is too small for the chamber or visa versa.

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    Quote Originally Posted by Taurus1965 View Post
    Thanks.Think you are correct. These were my first attempt at .458 socom reloads. Most of the info I was getting was load with light crimp and start at a very low powder charge.
    Crimp tension is important for obtaining a good seal- especially with light loads. It delays the bullet pull enough to let the case swell and seal the chamber.

    You see the same sort of thing with .45Colt loads using light bullets and light powder charges in lever action rifles. Some folks in CAS want to use 200gr (which is light for .45Colt) or even lighter bullets over minimal powder charges but complain about taking a face full of the blow by from their rounds. With a .45Colt load, you can watch the discoloring on the side of brass retreat as you increase the powder charge.


    Either crimp the snot out of them to delay the bullet from leaving the cartridge until a seal is obtained or up the powder charge. You might not get rid of it completely, but you can get it so that it's just near the case mouth.
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    I suffered this blow back scorching in .32 S&W Long for a long time. I started loading to above current load data standards before I finally got enough case expansion to eliminate the blow back.
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    What JTG ^^^ said, plus, check your OAL and maybe try a bit deeper before you up the charge. I seated my Poly coated lead 300gn bullets at 2.035 - but was using a less than optimal powder. I'm going to try IMR4227 pretty soon.
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    Quote Originally Posted by jtg452 View Post
    Crimp tension is important for obtaining a good seal- especially with light loads. It delays the bullet pull enough to let the case swell and seal the chamber.

    You see the same sort of thing with .45Colt loads using light bullets and light powder charges in lever action rifles. Some folks in CAS want to use 200gr (which is light for .45Colt) or even lighter bullets over minimal powder charges but complain about taking a face full of the blow by from their rounds. With a .45Colt load, you can watch the discoloring on the side of brass retreat as you increase the powder charge.


    Either crimp the snot out of them to delay the bullet from leaving the cartridge until a seal is obtained or up the powder charge. You might not get rid of it completely, but you can get it so that it's just near the case mouth.

    agreed, I am shooting sub sonic from my 300 Black out (208, 210, 220 grain projectile) and nary a sign of blow by, good powder selection at the correct amount (but not to much) and a good crimp with a Lee FCD
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    Going to start with 30 gr. and a little heavier crimp and work up. Using 350 gr. Berry bullet. Going to try an OAL of 2.10. Will post results.
    Yissnakk likes this.

 

 
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