I had a 10" 22lr barrel with a rounded crown, an older bull barrel. It shot great with open sights, for what it was. I scoped a 22 lr match barrel with a rifle scope for NRA Hunter's Pistol. It really isn't the crown that affects accuracy, the ammunition does have more to do with it.
In the usual ammo, Federal Lightning (now Gold) or Winchester Super X was about the same. Accuracy is good, not fantastic. I tried some variations at 75 meters and they all bombed! Winchester Wildcat (white box), Subsonics (green box) etc.... all were worse. Anything under 40 grain roundnose in weight, didn't carry to 100 meters!
Now I use three kinds: Winchester X22LR, CCI standard velocity and CCI Green Tag. The CCI Standard Velocity will work if you can adjust your sights for it. There isn't a firearm that doesn't like the consistency of Green Tag but, sometimes the wax is too thick on the bullet.
If (and this is a big if) you happen upon PMC Sidewinders in 40 grain, it's probably one of the most accurate to shoot. Runs right along with Green Tag.
Never mind Velocitor or value paks, that's for kids.
Thought the scope was off, nope, one shot in the quarter spot at 50 meters! That's my best friend there. Super X 40 grains