Thanks to you all for your input..
I've been in absentia from this forum as of late.
I have not been able to find a copy of Browns book on shotgun to double rifle conversions.
It's Out of print at the moment..
Anyone have a copy to sell?
Anyway, I want to fit my action with firing pin bushings to guard against primer set back.
I have seen this occur on another shotgun conversion in the past.
The material behind the face at the pin locations was found to be very thin even though the action had a hardness (case)? of around 35 Rc. so, Over time after firing a couple of hundred rounds an obvious depression in the face occured by way of the primer?
There did not appear to be cratering around the pin indent or increased head diameter so hot loads were ruled out.
I think the material thickness at the pin locations on my action is also thin and believe,
bushings will stave off any potential problems in this regard?

opinions?

Tom