The first time I touched off a round in my LCR 9mm I was surprised. Ouch.

I replaced the grips with a larger Hogue grip that is shipped on the LCRx 3" model:

Ruger LCR No Finger Groove Rubber Tamer Cushion Grip Black | Hogue Inc.

That grip made the gun usable for me. But it's larger in your pocket.

Another issue with the Ruger (18 oz gun) is crimp jump with some types of ammo.

Fortunately the problem is only with a few ammo types, and most of the leading SD ammo works fine. I don't know if crimp jump is a problem with the slightly heavier M940.