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.223 reload test

Discussion in 'Black Rifle Forum' started by BobbyS, Apr 30, 2011.

  1. BobbyS

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    You Talkin ToMe

    Feb 14, 2010
    Boonies New Mexico
    Am loading up some .223 for AR. Been reading all about bullet setback and crimping vs not crimping. Here is what I did: I loaded a 55gr. JHPB dummy round to 2.250. Loaded it into a magazine and chambered it, ejected it 5 times. Each time the bullet did not setback, it increased the COL by .001 each time.

    I crimped the round, it is non cannelure bullet (bunch of people who said they crimp used non C bullets). After chambering this round once and ejecting it I measured it and the COL increased by .005.

    I thought this interesting.
  2. Gunnut 45/454

    Gunnut 45/454
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    Jun 20, 2002
    Bullet set back shouldn't be a problem unless your brass is worn out or your sizer button is to big! I've not seen it as a problem in my AR's. Thought the rule of thumb is if the bullet has the crimp grove -crimp the bullet into place! I've found a mild crimp is more then enough and heavy crimping usually makes for an inaccurate round! On bullet with out a grove the same applies usually the accuracy takes a dump!:supergrin: If your going to crimp bullets with out the grove try a tap crimp- chamfer the inside of the case and apply a lite crimp.