i own a handi-rifle that is chambered in 223 remington. it is a bull barrel model. i inherited this gun with no paperwork, so it is not like i did a bunch of investagation before buying it. before i get myself in trouble with it, i figured i would ask a couple of questions. since it is a bull barrel, i would think that it would be fine to use N.A.T.O. military rounds in it, am i correct? also, again, since it is a bull barrel, i would think that loading near the top of the PUBLISHED load data would be ok, of course watching for pressure signs like normal. again, am i correct? i guess, i am assuming that there is more steel all the way around the full length of the barrel, thus it sould be stronger. maybe i am mistaken? i would also asume that since the "frame" of this is used all the way up to a 45/70, i shouldnt have to worry about that part of it with a 223. one last thing, anybody know what twist rate this thing has? i tried the tight patch thing, and it looks like ABOUT a 1 in 12, but i am not real sure. i got a couple of different readings, depending on how "tight" the patches were.