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Crimping 7mm rem mag?

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I am just getting into reloading. I save been watching videos and the guys on you tube don't crimp their rounds but the Lee die kit I got has a crimper. I am using the Berger 168 vld

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Don't crimp.

 

UNLESS you have a bullet with a factory cannelure (the indented ring around the bullet for the crimp to hold into). Even then, I never do. Neck tension is plenty to hold a bullet securely in the case mouth, and improper crimping does more harm than good.

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I never crimp, not with my 7mm mag or any of my other rifles. I also use 168gr bergers for the 7mm mag.

 

I used to do a slight crimp on my .223 AR-15 rounds as the bullets I was shooting had a cannelure as lancetkenyon suggested. But I quit as I noticed no difference in shooting.

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The only rifle I crimp in my 45-70 because they have the cannelure and the recoil is pretty nasty on that little gun. I would hate to have a round pull apart or jam in the tube. I doubt it ever would but it isn't worth finding out the hard way.

 

I used to crimp rifle rounds before I knew better, and it isn't hard to over crimp and distort a shoulder on the case and ruin a round.

 

Magnum handgun rounds like .44 mag and heavy .45LC I do crimp though, just not super heavily.

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