Re: Do manufacturers crimp all factory 223 ammo?
Most factory ammo has what Lee calls a foctory crimp. Its usually about four places around the mouth of the case where the case is pushed into the bullet hard.
Describing it is hard but it is a series of semi-circular narrow lines about 1/32 of an inch down from the case mouth.
You can duplicate it with the Lee Factory Crimp Die. The die is like a lathe collet and as the case enters the die the segments of the die close in around the case mouth and push the brass case hard into the bullet. It works well, by the way.