BillCA,
"I suspect that reloaded ammo will have a considerably more noticeable muzzle flash than factory."
From my 327 reloading experience with H110 and PP300MP, they definitely have a larger flash, and are much dirtier than AE 100gr. Also they significantly fall short on muzzle velocity. It'd be nice to know what witches brew federal is using.
Some 327 hand loads here:
http://thefiringline.com/forums/showthread.php?t=454312