I had a rem870 that i turned into a slug gun. I order a hastings rifled barrel for it and a rifleman shotgun scope. Ive been shooting the hornady sst slugs out of it. I havnt been able to shoot consistent groups out of it. Its all over the place. I shot 50 and 100 yrds. I almost feel bad for putting money into it. ive heard from alot of people that these guns can get descent groups out to 100. Any help???????????????/