I use mostly all Federal Premium 223 ammo from my dept. Still, on occassion I will reload just to use a different bullet. Most coyotes I shoot are not the size of a dime, so dime sized 5 shot groups just isn't neccessary for me. The Federal stuff delivers good enough accuracy for coyotes.
However, I used to experience bullets getting pushed back into the cases once in awhile with my reloads. I purchased a Lee Crimp die and some problems went away. Never again did I experience the bullets getting shoved back. What I did find is if the cases are not all trimmed to the same lenght you will create another set of problems using the crimp die, ie, crimp occurring in various locations on the case neck. Also if the neck are not all the same thickness you could end up with different neck tension on your loaded ammo again creating accuracy problems.
On another note, I did replace my 223 dies and have had little to no problem with bullets getting pushed back. Obviously this was due to poor neck tension with the other dies.
In John Feamsters book "BLACK MAGIC" in chapter 5 on page 174 and 176, Feamster talks about crimping. He states " NEVER CRIMP the bullets when seating them in your AR ammo. He goes on to state "any standard dies should produce adequate neck tension to resist bullet set-back during feeding and to check your rifle if you experience this problem".
