The Ruger and S&W rimfires should take dry snapping with no problem
Can I dry fire my S&W handgun?
Q: Can I dry fire my Smith & Wesson?
A: Yes, except for the .22 caliber pistols which includes models 22A, 22S, 422, 2206, 2214, 2213 and 41.
.22 caliber revolvers such as models 17, 43, 63, 317 and 617 also should not be dry fired.
Q: Why can't I dry fire my .22 pistol or revolver?
A: Dry firing a S&W .22 pistol or revolver will cause damage to the firing pin.
IMHO, it is very fine to advocate the use of snap caps to avoid potential trouble. But it is simply not true that dry firing will result in problems with any modern rimfire IF the gun is set up properly.