There are a few I have not shot, but likely have shot against about all of them (standards), in competition. I find the loading combinations are more important
to achieving accuracy, than the make of the barrel. Loaded as I like to, they all seem to shoot very well indeed, with some showing slightly better accuracy or easier loading.
I have preferences, as would most people. I like the flat bottomed Rice Barrels, I like the flat bottomed GM barrels & Goodoien match barrels also flat bottomed and wide grooves
GRRW and Bill Large barrels - all flat bottomed. I have a round bottom deep grooved Getz, bl. with fairly narrow grooves that is giving slight loading difficulty with combinations that
fill, however it does not seem to need the hard compression in the bottom of the grooves that I prefer in shallower, flat bottomed grooves. It needs more "range" work.
I have shot reasonably well with a Toenjes .028" deep .60 cal. barrel with rounded grooves, & a D. Getz .025" deep rounded .75 cal bl., however, I do prefer .010" to .012" deep,
flat bottomed rifling and feel there is nothing gained from deeper grooves, other than they look funky. The deeper the grooves, the more finicky they seem to be for patch/ball thickness.
With standard rifle bls. as noted, 010" to .012" deep & grooves same width or even better if wider than land width, RB twists of 60" to 80"twist, a .005" smaller than bore ball and 10oz (.022")denim patch, I can shoot 1" or tighter 5-shot groups at 50 yards, rest - generally 1/2" with some 'experience' with THAT rifle. Some barrels, like my old, oft-shot .69 GRRW barrel
has made 1" to 1 1/2", 5shot groups at 100 meters & 2 1/2" 5shot groups at 200 Yards shot off a table using a normal bench rest. Taylor's newest Rice .62" bl. on his Hawken has done
the same, at 200yards - open sights and benched. His gun seemed to like 130gr. 2f GOEX and mine likes 140gr. to 165gr. 2F.
Back in the 80's, I made groups at 100 yards that ran 2" using a Lyman Zouave .58, with a .575" ball and .022" denim patch with 120gr. 2f GOEX. At that time, my .58 Large barrel was doing
1 1/2", but needed 140gr. GOEX 2F, same ball and patch combination.
So- I strongly believe that what you feed them, is VERY much more important that who made the barrel.
Here's a shot at a 200yard target using 140gr. A mild, but forceful push.