Thanks Piper. With the right barrel having a parallel and the left not I kinda thought it was a fluke. I have measured the bores and chokes for all types of things to find the differences. If I duplicate the 3/4" parallel in the left barrel I will take the slightly tighter than full barrel and open it to light full. If it doesn't work I can duplicate the right barrel and have Imp Mod in both. This has been a project gun for me I would like to do all the work myself.