From a thread on this forum titled ".22LR Revolver", post #52.
These tests were made with a LCR-22LR.
"My LCR 22
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Traded for a LCR 22 and checked it at the range with my wife. She has weak hands, can't rack a slide and can't cock the hammer on centerfire SA/DA revolvers. Trigger pull at the dealer was about the same as for a SP101 and much better than a Taurus 94. Better price too and no hammer for her to cock.
At the range we shot over 50rounds of a variety of ammo with no malfunction of anykind. The little revolver shot to POA for me. Wife got a little used to the trigger after 3 reloads and began putting shots on the paper plate at about 4 yds. The trigger pull is more than for a .38revolver and she tended to pull shots right and up just off the paper plate. But the trigger is unusual in that it can be 'staged', pull to about half way then hold aim and fire. Don't know if I described it correctly, but a nice idea.
I then did some Chrony tests to compare with what Jeff Quinn reported....
http://www.gunblast.com/Ruger-LCR22.htm
Average results...
Win Dynapoint...860fps.....JQ...866.
CCI MiniMag.......1000fps...JQ...928
Fed BulkPac.......980fps......JQ...831
Velocitor............980fps......JQ...885
Stinger..............1300fps.....JQ...NA..."
I resurrected this thread to no avail on account of the velocities of the Mini-Mag and Velocitor. Both test shown above (with the LCR) show the Mini-Mag with a higher fps than the Velocitor. Ruger's site shows the Velocitor being faster, probably with a rifle barrel. It's something to think about, or disregard...I thought it was interesting.
Hornady's special .22WMR goes 1000fps from a 1 7/8" barrel (from a few posts up)
The results I just copy/pasted show the .22LR Mini-Mag at 1000 and 928fps.
Another test with a 2" barrel:
Speer 40 grain GDHP-
SB: Average velocity = 970 fps
Note: the highlighted SB stands for "short barrel."
Recap:
Hornady special .22
WMR, 1 7/8" barrel,
1000fps
Speer special short barrel .22
WMR, 2" barrel,
970fps
CCI .22
LR Mini-Mag, 1 7/8" barrel,
1000fps and
928fps (two tests)
Draw your own conclusions, but it'll take a lot more than this (on paper) to convince me that the .22WMR will substantially out-perform the .22LR Mini-Mag from a short barrel.
After factoring in the ammo cost, probable reduced practice, and two less rounds, I just can't see any advantage that the LCR-22WMR has over the LCR-22LR.
That's just my opinion.