I think that most of the barrel makers have come a long way in the past few years. The chocked CZ, LW and FX barrels all shoot many pellets quite well and even a few slugs. But with the FX you can change the liner in a couple of minutes to shoot a completely new set of projectiles just as well.
My 700mm slug A barrel shoots NSA 33.5, 36, 36.2, 38.5 and VK 34gr less the MOA at 100 yards all on the same tune. It has also shot the JSB 33.95 MKII pellets just the same at the same range on a windless day. To be honest I have only tried a couple of other slugs as there is no reason to take this any further as what I have shoots so well there is really no reason to do so. The FX barrels have another big plus going for them also. They are so much lighter than any of the others they have no competition in this area. For me to switch barrels the other would have to perform hands down above the FX and there is nothing that will do this as far as I can see.
I have a 500mm .22 barrel on my gun now and with a good tune I expect it to shoot just as well. Why? Because I have seen others do it.
Barrel comparisons are hard cuz if you give a barrel what it likes to shoot most will perform admirably for you. But if you expect a CZ, LW or FX to like the same projectiles, and a multitude there are out there, think again because it usually just isn't so.
As far as sniperqty's test it means little to nothing as he shot the test with only one pellet and one tune and with the old style Smooth Twist barrel not with an STX or one of the newest Superior liners. So all that is proven here is that the gun, with it's specific tune and the LW barrel, liked the pellets he was shooting, at the speed he was shooting them, slightly better than the old style ST barrel did at that same speed. So really not much of a test at all it was.
Now if he used many different pellets, preferably the pellets the barrels liked best, at many different speeds for each barrel and pellet combination the results would actually be useful.