Most rifle die expanders are .001 smaller than bullet diameter, all you need to do is polish the expander down to .002 to .003 smaller than bullet diameter and a crimp is never needed.
As stated above a crimp is not needed as long as you have enough bullet grip or neck tension.
Some people remove the expander from their die and expand the neck in a separate operation with a expander die.
Below a Lyman type (M) expander in .223, as you can see the expander is .003 smaller in diameter than a bullet diameter.
The .226 section of the expander is used to just bump the case mouth for a very slight flare to aid seating and help seat the bullet straight and reduce runout.
So again with the proper size expander a crimp is not needed.
I also have a Sinclair expander die and the expanders are .001 and .002 smaller than bullet diameter.
Reply With Quote
Bookmarks