I'm looking to replace the barrel on one of my 6.8mm SPC AR-15's, and I'm thinking about trying out a .243 WSSM this time around for even more oomph and better BC's (albeit at an increased powder cost).

How well are the WSSM AR-15's feeding? Obviously it's going to be a single stack mag proposition, but even then, are they really feeding reliably?

This is a rifle I primarily use for deer and coyotes, and a little paper punching.