RWTF: the caliber is 22lr, the length of the insert barrel is short, as opposed to a longer alternative also offered by the manufacturer. I don't know the exact model--it says kreighoff on it.

xausa: Thanks for the pad offer! Don't need a 20 ga. but will keep an eye out for anyone who does. Steve
I decided to try the SteelBed on the fixed (part of body)pads, before reading the posts this morning. Seems to be a viable material, especially as it is only a 22. after shaping to "close," the material smoothed slightly to a well-shaped fit upon closing the action. Yes, it is softer than either solder or steel, but I think maybe it doesn't HAVE to be any harder just to position the housing for sight in. It will also be possible to redo it if it becomes necessary. Will update on success or failure of the project...still would like to have the new floating pads in the milled recesses, xausa...Steve