Don;
Yes I had indeed missed that point if it is in fact true. As I said I have never owned a gun with this bolting system, burt as far as I knew it only pulled the barrels down against the frame. I had never heard this aspect mentioned before.
If it does serve this function it will of course require careful fitting or will be like many of the rotary top bolts & still serve only a single purpose.
If it is in fact fitted firm enough to unload the hinge then it is one of the few older actions which does so.
8-Bore;
Am I save in assuming on the Berettas you are speaking of the lugs on the sides of barrels which fit cutouts in the receiver side wall. I can definitely see how these could be fitted to unload the trunnions a bit.
I cannot say for certain the rear lump of a double underbolted gun has ever been fit to actually unload the hinge but if properly fitted with minimum clearance shoild certainly be a plus in resisting the bar from stretching.
Thanks for both for all the input. When I asked What makes it stronger, this was the sort of answers I was seeking. Just the fact it could clamp the barrels tightly to the bar didn't really impress me all that much. This other adds much more to think upon.
