I have fired my 357/38 Texas Defender with the 3 inch barrel. The top barrel is right on target and the lower barrel shoots low, I will figure out the elevation needed to get shots on the X. I have taken advantage of the reduced price on a second barrel and I’m looking forward to firing the 4.25 inch .45/.410 when it arrives. I hope that you will consider making a .45/.410 carbine. Thank you.