My experience is spread over several Kriegers, one Benchmark 3-groove, one Lilja titebore, and just getting started on shooting with a Bartlein on a V-22 bbl'd action from VGW. Don't know how close the Ravage reamer that VGW uses is to the EPS from PTG that I have used on my barrels, but...here's what I've seen over the past three years. SK Std+ is sometimes pretty good, but always has more fliers than either SK Rifle or Pistol Match. I tested at least a dozen lots of Rifle Match before finding one I felt was good enough to buy in quantity. Pistol Match (not Pistol Special - it's loaded to slightly higher vel, and from all I've heard from online friends, hasn't shot nearly as well as plain Pistol Match) OTOH, has been uniformly good. I bought six lots to test, and four of the six shot about as well as the best of all the Rifle Match lots. Almost a year after buying a full case of Pistol Match, I bought a half-case blind - no testing, no asking for a specific lot# - and it's very nearly as good as the picked lot that I bought the full case of. Lapua Center-X - again, I bought beau coup lots of it to test, and by the time I finally found a lot# that was pretty good, it was all gone, none of the suppliers I use had any more of it in stock. I did get almost a half-case of a fairly decent lot, and while it doesn't shoot any better than - and sometimes doesn't shoot as good as - SK Rifle or Pistol Match - at 100yds, it will usually out-shoot either by a small margin at 200-300yds. Lapua Polar Biathlon has out-shot anything else I've tried at 200-300yds, but again, it was a case of finding a lot# that my barrels liked. A friend lucked into a case of this stuff from a gun shop that was selling out of the Lapua they had in stock. He gave me a 50rd box to try, and it was considerably better than any of the other lots of bi-polar (as he likes to call it) that I've been able to test. And now that Lapua's advertising a newer version of Polar Biathlon, I'm thinking that I'd rather send the newest Bartlein bbl'd action off to the Lapua Test Center in Az. rather than to test it myself.
The really neat thing I've seen with this new bbl'd action is that it shoots really well with the lot# of SK Rifle Match I bought two cases of....but have only shot it at 50yds so far. Finally finished our corn harvest last week, so when we get some decent weather again, I'll be out & about with that rifle, doing some shooting at 100-200-300yds with it. Hopefully, one or more of the test lots of bi-polar I have will shoot well at longer range in this rifle than they did in the Kriegers I chambered myself...