.50 cal. Bullet Resizing

.50 cal. Bullet Resizing

This is a discussion on .50 cal. Bullet Resizing within the Technical Problems forums, part of the SniperForums.com & SniperCentral.com Related category; I have been reloading for about 40 yrs. I have now come upon something I do not understand. Chiefly what is meant by "resizing" .50 ...

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Thread: .50 cal. Bullet Resizing

  1. #1
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    .50 cal. Bullet Resizing

    I have been reloading for about 40 yrs. I have now come upon something I do not understand. Chiefly what is meant by "resizing" .50 cal. bullets. Why would this need to be done on a bullet, which is supposed to be .510 in diameter when they are made? This is my first .50, and have never run across this for any other caliber.

  2. #2
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    It's mostly for fixing pulled bullets. When yanked out, they often get deformed. If you don't get them through a sizing die to reform them, they can give you nasty pressure spikes, blowing up your rifle and possibly your face.

    I buy new bullets, to avoid this issue. However, even some new 50BMG bullets will be slightly over-sized or out of round.
    sherman likes this.

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    Senior Member deadshot2's Avatar
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    ^^^^^^^^^^

    What he said.

    If you are buying pulled bullets of any caliber, it's best to buy only "collet pulled" bullets. At least with this method he bullet is being gripped by a device that doesn't deform the bullet as much (if at all).

    A problem with bullet sizing when you're dealing with a jacketed bullet is the fact that the jacket material has some "spring" to it and the underlying lead does not. When you size the bullet the sizing operation compresses the jacket a little more than necessary in order to make sure that it is the proper dimension when it leaves the die. Any spring-back will leave a void between the jacket and lead. This can give you a horribly unbalanced bullet that will be almost impossible to get any accuracy from.

    Some "de-milling" operations use what's referred to as a "tractor pulling system" where the bullet is gripped by a pair of rotating "wheels" (not unlike the striker wheel in a zippo lighter) and even if it doesn't leave nasty marks, makes the bullet oval in shape. All the more argument for collet pulling.
    sherman likes this.

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    Thank You for the education. Mr.B

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