Ajax,

Thank you very much for starting this thread, and for others to guide it to its logical conclusion.

As a result of this discussion I've cancelled my order for an Axiom HT setup (M22ti's, VP100, QS4's) and will instead be investing my money in an acoustically-matched set of Freedom Arms Model 83's chambered in .454 Casull.

The Casull provides clear surperiority in SPL levels (although its response isn't quite as flat) over the Axiom line. Better stopping power too.