About Yellow Jacket - I used it for one of our weekly mini-3p matches and it was first ahead of a few annies, CM's and whatnot. Ergonomics of that fancy stock makes it a very good shooter. I never had it to any matches this year but in our club people still remember my Yellow Jacket. For some reason people thought it was bolt gun - it was quite a surprise when I mentioned it is semi. Accurate, yes, but it is semi. Some people just can't get used to this idea.
JellowJacket ammo didn't work very well particularly, inaccurate and few stovepipes. Same with stingers and I think about the only good out of "hyper" stuff was Velocitor.
Good ones were CCI standard velocity, Lapua super club, Fiocchi. And Eleys of course. Out of bulk stuff Federal seemed to cycle well but wasn't particularly accurate. Same goes for Winchester super-X, great reliability but accuracy so-so. But then again - every rifle is different, you should try all available ammo no matter who says what.