One down side to the longer barrel is the time in bore that allows a longer opportunity for shooter error to influence accuracy. This is purely my opinion so take it as such, but I feel with the low energy of the 22lr the whip that is generated in the firing process is absorbed (or depleted) the longer the barrel is which allows the barrel to settle more before the bullet exits the muzzle. I also feel that a longer barrel will have less whip at the muzzle than a shorter barrel (when shooting heavy target profile rimfire barrels). Most have always produced excellent accuracy but just not as consistently as the longer barrels. In my testing I have found that all too often 18" to 20" barrels are a bit faster, and have a tendency to be erratic. I have tested a LOT of ammo and find that 1060 give or take 10 fps is the sweet spot. So maximizing velocity is a negative in my book. IMO this is the LAST thing you want to happen with these super low BC, non-aerodynamic mini flying bricks we are shooting. Depending on the conditions in which your shooting and the barrel your shooting out of the MV can be getting very close to that transonic velocity. If your chasing accuracy with the 22lr then you will be shooting subsonic match ammo. I have a few theories on barrel length vs rimfire accuracy: If it is choked you need to put the crown right at the tightest part of the choke, period.
Exactly how long honestly depends on the barrel. IMO the optimal barrel length for rimfire accuracy is in that range. I have had a few fairly decent shooting 22lr's over the years, and all of the best shooters have had barrels of 24" up to 27". So, as usual, I feel it really comes down to just which ammo works best in your particular barrel. But, lower MV's is not necessarily a "bad" thing as depending on the ammo you use, this can help keep you MV's at subsonic where in some cases (like with a SS barrel, velocities can increase to supersonic). 22 LR ammo being shot from various barrel length, I can see that the MV number are indeed noticeably less than the shorter rifle barrels. as some will have a little longer burn rate). 22 LR barrel length one is going to see less MV than one would from a 16" or 18" barrel of the same material (subject to certain ammo's burn rate. Ignoring all the specifics of this, I'd say (in general) when you get 24" or greater in a. And another factor is the material the barrel is make out of and the construction specs (a tight barrel will produce more friction than a lose one). We do know that depending on the amount of powder and it's burn rate will produce different velocities out of various lengths of barrels. My planned use is PRS style shooting but I’ll still be doing some bench 100-200 yd stuff as well. If a 26” barrel was more beneficial I would have no problem running one of my 22LR, but if a 16-20” barrel yields the best MV then I’ll go that route. I use a 26” barrel length in my 6.5 PRS comp rifle so, Thanks man, I do agree that intended use should dictate Barrel length however, if a shorter barrel gives a maximum muzzle velocity, then why would a bench rest shooter, looking for groups and wind bucking ability at 100 yds go with the longer barrel? If the bullet reaches maximum velocity at 16”, then with a barrel length of 28”, the bullet is slowing down considerably due to bullet drag on the rifling on top of the fact that the longer the bullet is in the barrel there is more opportunity for shooter induced errors imparted on the bullet, why would the shorter barrel not be suitable for bench rest? I can understand why a long barrel may not be as suitable for PRS type, as it can make it unwieldy, but not getting a firm grasp on how that works the vice versus scenario.
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