I have 5 different slug guns with rifled barrels and scopes. I am not sure why but I do. My 2 favorites are my H&R's. I have a 12 gauge and a 20. The 12 is my go to gun. I can honestly say that me nor anybody else I know has seen the 20 gauge shoot better than the 12. It all depends on the shell you are shooting. Personal preference is another big factor. I have shot deer out to 246 yards with my 12 gauge. I am sure my 20 will do it to. I just havent had the oppurtunity to shoot a deer over 120 yards with it yet. I can say that my 20 gauge H&R with the thumbhole stock and a nikon 4x12x50 shoots a 1 inch group at 100 yards and is 13 inches low at 200. My 12 gauge with a 4x16x50 shoots hole for hole at 100 yards and is 11 inches low at 200. I personally prefer my 12 gauge since it has been the demise of more deer than my 20 gauge but only because I have had it longer.