Hey guys I have 2 ?s first my barrel has sb2 stamped on it.but I don't see it on the frame anywhere.Where should I look ? 2nd Ihunt on public land and it's illegal to target shoot there.So where I sight in my rifle Ican only shoot 50 yards and where I hunt shots range from 20 to 200+yards so how would you suggest I sight in at 50 yards.BTW 150gr factory loads. Thank You