I just bought a H&R bull barrel 243 for my sons to shoot when they get a little bigger. I can't seem to get this thing sighted in. I swapped scopes. I swapped rings. Cleaned it real well. Tried a couple differnt brands of ammo. I've put about 60 rounds through it and still the same out come. I can't get it any closer than a 4" to 5" group at 100 yds. So I started looking for forums. I found a few with the same problem. Some said that these rifles are very sensitive to pressure on the barrel and forearm and that you should rest on the frame in front of the trigger gaurd. (Makes sense to me seeing as it's a break over action) Also I read a few that said the rifling (1 to 10) in this gun does not shoot factory 100 grain ammunition very well and that it should shoot better with 70 grain or 80 grain ammo. I'm looking for some input. Please help.