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I just picked up a Lee Crimping Die to use for my 223. I heard that it may result in better grouping. Any tips on using this tool? I glanced through the directions but haven't really tried using it yet. I have some already loaded up 223 rounds and I want to see if a crimp tightens my groups up any. Thanks.

Good luck

Be cautious when crimping existing loads, especially if they are at or near max pressures. Crimping will cause pressures to rise, sometimes dramatically. I have never tried crimping myself, was always told it would hurt group sizes. But then again, I was told Sasquatch lived in my backyard and would eat me if my grades in school didn't improve!! LOL

Neck tension might be worth taking a closer look at for accuracy.

GOOGLE is your friend. I crimp only my .45 ACP but am very perticular on my neck tension.

.003 is close to gooder

I would not crimp my rounds. I know that is not your question but...................

Crimping youre cases canbe a hit and miss and you can gain the samething buy just neck sizeing with a bushing die.. With the crimping you would have to turn youre necks so they are all uniform thickness and uniform in length... If you have a case with a thicker neck then the tension willbe greater compared to another round that has a thinner neck wall...One round will give you a higher pressure and viseversa..
Crimping was designed for cases that are to be fired in a auto or semi-auto and tube feed rifles to keep the bullets from moveing into a case as the rifle was fired and crimping is also used for hand-guns..

if your looking to increase accuracy, I would first play with powders, powder weights, COAL, Primers. What I have been told is that crimping can be more of a headache then its worth