Using the formulas at the link below, I make the loss out to be about 65 fps, based on a muzzle vel of 1700 fps with the longer barrel.

http://www.loadammo.com/Topics/October05.htm

Ron

 

22 Mag Velocity from Revolver

CCI advertises their 40 grain 22 Magnum gets 1400 fps from a
SIX inch revolver. Their 30 gr +V gets 1600 fps from the same.

That's not exactly the answer to your question.
'Just something to throw in the mix.

Hmmm . . .

Thom T

 

CCI advertises their 40 grain 22 Magnum gets 1400 fps from a
SIX inch revolver. Their 30 gr +V gets 1600 fps from the same.

That's not exactly the answer to your question.
'Just something to throw in the mix.

Hmmm . . .

Thom T

I guessed at the handgun velocity at muzzle. If the longer barrel has 1400 fps then the formula predicts a loss of about 55 fps if you cut 1" off the barrel.

Ron

 

I read somewhere that a .22 revolver pretty much achieves as much velocity as it's gonna get at 4". There may be some slight difference beyond that, largely depending on ammo type.but not enough to mean much. And that w/longer barrels such a the 9.5, you can actually lose velocity.
Since the rear of the barrl is open, it doesn't build pressure like a closed system because beyond a point it equalizes and is free to blow pressure out the rear. Your principle advantage w/a longer than 4" revolver barrel is a longer sight radius. The 5.5" Single Six is my prefered choice for ease of holster carry.

 

With one in both 22/22 mag and 17hmr in 6 1/2 barrel ilike the lomger sight radius vs the shorter barrel. Make it easier to hit game with. Like you say they are very fun pistol's to own. Have fun with what ever you choose.

 

Velocity vs Barrel Length

I am not a technician but . . .
I suspect that a 22 LR bullet fired from a revolver
obtains a very high percentage of its velocity as
it departs the chamber. (Anyone know that figure?)

But I also believe that significant velocity increase is obtain as
the bullet travels (is pushed) through and out of the barrel.
I don't know the duration of that push translated into barrel length.

At what rate does the blast (pressure) from a "X" caliber bullet, fired from
a revolver persist to push the bullet out the barrel / escape from
the cylinder gap? Hmmmmm (That calculation is beyond me . . . )

Thom T

Questions upon questions upon questions . . .

 

Single Six 5.5" vs 6.6" Velocity

Thanks for all your responses.
I think we all know how the 22 WMR was designed for a rifle (with a closed bolt) to achieve about 2000 fps w/40 gr bullet at much higher pressures (that don't escape from the breach) than the 22LR.
The 22WMR is amazingly powerful out of proportion to it's small size (it's a tiny rimfire cartridge) In a closed bolt rifle barrel, it most efficiently accelerates a 40 grain bullet to the maximum that can be had with all it's ingredients. But how much of that pressure and efficiency is wasted in revolvers with cylinder gaps? Is there still pressure pushing/accelerating the bullet after the first 4 inches of barrel? How about 5.5" or 6.5"? Most barrel length tests I've seen are based on closed breach chambers. Is there a significant difference in velocity with a revolver with a 5.5" or 6.5" barrel in 22WMR?
I have a friend who swears that he can shoot "twice as better" with a 6" barrel H&R 22LR DA revolver, than he can with a 5.5" Ruger SA 22LR. If "pointability" is merely the deciding factor, than should we just ignore the velocity, energy and down range flat shooting trajectory?