I have tried the LCR 22 trigger, The LCR 38 is known for its awesome trigger, which your not gonna get on the LCR 22.
I can tell you that of all the .22 cal revolvers out there that Ive tried, it has the best trigger.
Rimfire takes a lot more force than centerfire to ignite the primer, so the hammer spring on all .22s is a lot stronger, therefore a heavier trigger.
Jim