Yes I think more speed or heavyer slug = recoil would bring the two barrels together,now I,d only had this for 8 hrs ,just long enought for the glue to dry before testing ! barrels are still 28in long & no recoil pad (it HAS recoil not like my 15lb 12 bore )and I think it,s a little ugly to grace these pages just yet ? Say if & when I cut the barrels down to 26 or 24in I suppose all bets are off for the grouping then ?