I have a system one with two barrels a 50 and a 54. I normal shoot the 50 with 130 gr. app a black knight sabot and 230 gr. XTP. It gives me 2 inch or less groups with a 2.5power scope at 100 yd. and has worked real well for Deer[good blood trails and usually drop with in 35 or40 yds. I use the 54 with 140 gr. and either a 300 gr. widner 50cal bullet or a 300 that I have HP dowm to 270gr. I use a purple sabot and like it for wild boar, bearand elk one of these days I would like to try it on moose. It shoots with the same scope and a little better extreme range accuracy.[200yd]I have use these since TC first came out with system one and like them. Lee[I sold my other 3 inlines]