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-   -   To Crimp or not? (http://www.firearmstalk.com/forums/f30/crimp-not-86796/)

Yamahog12 03-17-2013 10:22 PM

To Crimp or not?
 
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.

25-5 03-17-2013 11:11 PM

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.

mseric 03-18-2013 12:01 AM

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

mag_01 03-18-2013 12:50 AM

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

Yamahog12 03-18-2013 10:27 PM

Quote:

Originally Posted by 25-5 (Post 1179943)
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.

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.

25-5 03-18-2013 10:57 PM

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.


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