To Crimp or not?

Discussion in 'Ammunition & Reloading' started by Yamahog12, Mar 17, 2013.

  1. Yamahog12

    Yamahog12 New Member

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    I am just getting started in reloading. I have a Remington model 722 in .257 Roberts. The factory bullets I have (Remington Core Lokt), have a crimping groove. A year ago I had planned to get started reloading but I have not found the time until now. I bought some powder, primers and bullets at the local gunshop. The bullets have a crimping groove.

    If a bullet has the crimping groove, does it have to be crimped or can it be loaded without crimping? And- how do I know if crimping is necessary, or beneficial? My rifle has a box magazine so the shells aren't stacked end to end. I have been reading the Speer reloading manual, BTW. Thanks.
     
  2. 25-5

    25-5 New Member

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    First of all do a search on the reloading forum. All kinds of questions answered there.
    I do not crimp for my bolt rifles. 30-06, .303, and .243. So I ignore the crimp groove and watch the O.A.L However, I taper crimp (ignoring the groove) for my M1A .308/7.62x51 as it is semi auto.
    If you feel the need to roll crimp, you must hit the groove, and ever so slight or you will deform the bullet.
    Also I only neck size for my bolt rifles.
    See, now you have more questions! :)
    Get a good reloading manual, like Lyman, and read from the beginning, not just the loading charts.
     
    Last edited: Mar 17, 2013

  3. mseric

    mseric New Member

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    Not only do you not have to crimp for your Bolt gun, you don't have to seat the bullets to mid cannelure either.
     
  4. mag_01

    mag_01 New Member

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    Bottom line crimping is related to bullet pull --- example 44 mag 357 mag crimping imvropes accuracy (bullet pull) --- In A rifle better accuracy can be obtained with no crimping --- more than 1 round in auto. rifles must be crimped or you will end up with problems. A round seated out to A few ths. off the rifling in A bolt gun is usually accurate. good luck with your reloading --- Tom
     
  5. Yamahog12

    Yamahog12 New Member

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    Thank you. I did read the chapters on basics of reloading and not just the info for .257 Roberts. I read about the reasons for crimping, but I didn't see it addressed whether a bullet with a crimping groove had to be crimped. It looks like the answer is not necessarily. Thanks, again.
     
  6. 25-5

    25-5 New Member

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    You have the right idea. Just in these few posts you learned when you crimp into the cannelure.
    For other load data check out http://www.hodgdon.com/
    It is an informative site. You can choose data with different powders and bullet weights. And, it's free.