I have the H & R Pardner and purchased the .20 gauge rifled ultra slug barrel. I have read a numerous times these guns shoot the hornady SST's well. I cant get a good group at 100 yards, I am pulling my hair out trying to sight this gun in. I am going to change my scope from a Barska huntmaster (cheap) to the Bushnell Banner. Anyone else have issues with their H & R?