I have two Superlights; one in .223 and the other in .243. Sighting them in at the bench* proved they are both more accurate than I can hold offhand. I shoot Winchester's 45 grain JHPs in the .223 and their 100 grain Power Points in the .243.
*I've (thankfully) never been afflicted with the bech-rest malady! All my guns are subjected to my personal measure of "practical accuracy", meaning: Can my weapon and I, together, score off-hand hits on game at distances reasonable to the cartridge?
I also have standard contour barrels in .22 Hornet, .357 Magnum, 7.62x39 and .45/70, they don't offer any more practical accuracy, for me, than do the Superlights.
YMMV