Texas Star
US Veteran
No theory, to quote List of Changes 17463 5 Jul 1915: The Mark I Smith & Wesson pistol is that described by the Trade as the "Old Model". The Mark II, known as the "New Model", is distinguished by having the numeral II stamped on the left side of the frame. The "Old Model" was of course the Triple Lock.
The late Tony Edwards did extensive research into British Military Small Arms Ammo. He gave velocity figures as: Mk I Black Powder 700 fps; Mk I Cordite 600 fps; Mk II (cordite) about 600 fps. The 750 fps Dominion "455 Colt" was I feel sure intended for the RCMP's (stronger?) Colt New Service revolvers.
Peter
I agree that the Colt is stronger, but .455 Colt shouldn't be a problem for the S&W, either.
BTW, I've read that ammo boxes of some lots of MK III (HP) and IV (wadcutter) .455 ammo are marked as not being authorized for use against European foes. It was evidently thought to be so brutal that it was meant only for use on savage native peoples in colonies.
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