welcome to the wonderful world of lc`s.i shoot skeet with several lcs,a oo i had the chokes open to imp&mod,ideal grade that`s mod/imp mod and a pigien grade thats imp mod in both barrels.can`t see much difference in any other than the way they fit.i just shoot them the way i bought em,other than opening the forcing cones and shooting 7/8 or 1 oz loads. tom