Anyone using the 450 Bushmaster? Interested in hearing from persons who actually shoot this for fun or hunting. Not looking for comparisons to the 50bw or the 458 socom.

I have been thinking about buying a 450 Bushmaster AR, or just buying a upper for Bushmaster Varmiter. Would be a good gun to tote into a bear tree when hunting with hounds, I use a 45-70 Marlin 1895 Guide gun now. Something about having a AR that hits like a 45-70 intrigues me.