I use a Williams FP to shoot the metalic sight Smallbore and centerfire Hunter's pistol Silhouette game. I use a kind of modified taco hold and it works great with the 22 lr and 22 Hornet. I have only lost one match in the last two years using these sights. I would, however, say that the Hornet is about as big as I would want to go because of the recoil and the closeness of the apature to my eye.
Sixgun