by Hoot » Fri May 22, 2015 5:29 am
I have some C.O.P. 165gr all copper hollow points that I tried loading a while back. The biggest challenge was holding them back long enough for the powder to get cooking as they race down the bore rather quickly. Even with the hollow point, they are not very long, so there's not much to bite into when you crimp. As for powder, I had my best luck with Alliant 2400. Definitely benefits from a Carbine length gas system like the factory Bushmasters come with. If you experiment with them, be very careful as some of us had results where the unburned (slower) powders spit out behind the bullet without getting fully ignited, leaving a yellowish ball of unburned powder and a bullet somewhere still in the bore.
Hoot
EDIT: Looking at images of the Magtech bullets, they are clearly not like the C.O.P. ones I loaded. They may work better or not.
In Theory, there is no difference between theory and practice. In Practice, there is.