It might be you, and not the pellet. My Hatsan 95 .177 gets 1/4" groups with lots of different pellets- even if the skirt is visually damaged or bent.
I think it matters whaich AG you're shooting.....my QB57 is the only AG I own that shoots CP domes or HP well at all. The H&N FTT is the one my other rifles shoot well, but the Diablo exact match is the one mt QB79 loves best......go figure!PaperPunch1
JedPlease define your definition of "a one hole group."You need to specify the parameters, such as: number of shots in a group, range, shooting position, shooting conditions, sighting (iron or optics), if scoped what is the magnification, etc. All these affect the expected results.As was mentioned, the first place to look at is the shooter, then the gear. Gear (including pellets) is not a substitute for technique.Consistency in pellets is more than the rolling method, there is also head size and weight.
I sort my pellets and I get about half an inch at 20 yards with a 2240. So, yes, with a good barrel and a good pellet, at 20 yards, it should be a large clump. One thing to note is that the Stoeger come in 200 round tins like the Beeman do, and also appear to be unsorted. That said, they are worlds better than most of the RWS and other brands, even as seconds/bulk/re-packaged/etc.The H&N FTT come in 500 pellet tins for $14.50 and represent a very good deal, IMO, especially when you consider Pyramid Air's 10% off email coupon/codes and their bonus dollars. Under 3 cents a shot for sorted match grade pellets is a great deal.