I believe the .44 Special was the only .44 caliber that the triple lock came in, as the Special was introduced along with the triple lock. (Edit: 44WCF/44-40 was also offered later.)
According to the Standard Catalog of Smith and Wesson, the 44 Hand Ejector 1st Model, also known as the New Century, and affectionately refereed to by collectors as the Triple Lock, was chambered for 44 S&W Special, 44 S&W Russian, 44-40 Winchester, 455 Mark II, 38-40, and 45 S&W Special. Of course the great majority were chambered for 44 S&W Special, known to the rest of the world simply as 44 Special. Twenty three were reported manufactured chambered for 45 Colt.
The story of the 45 S&W Special has been discussed in other posts.
This is a very early Triple Lock, it shipped in 1907. It is so worn that nobody was interested in it, so I got it for a song. It still locks up and shoots as good as when it was new.
Yes, 1907 according to Roy Jinks. Notice the caliber marking on the barrel. Roy told me they had not made up the 44 S&W Special stamp yet.
According to Neal and Jinks, approximately 5,000 455 Mark II Hand Ejectors, 1st Model were supplied to the British Government between 1914 and 1915 at the beginning of World War One. This model was identical to the 44 Special Triple Locks, just chambered for a different cartridge. Yes, the Brits were unhappy about the possibility of mud clogging up the area of the ejector rod in the ejector rod shroud. I do not know if any problems actually happened, but the Brits did not like the idea. According to Neal and Jinks: "The British government accepted this model only as a necessary substitute while the factory tooled for the production of the slightly lighter model which did not have the shrouded extractor housing and the third locking system."
Note, the "slightly lighter model" was the 455 Hand Ejector 2nd model, which did away with the third latch. The same with the 44 Hand Ejector 2nd Model, the successor to the Triple Lock.
This is a 44 Target Model Triple Lock. These are less common than the standard model with fixed sights. I am not going to say how much I paid for it, but if I found one of these in a barbecue version for $950 I would probably grab it, just because it would be so unique. But don't forget, that $950 price is from over ten years ago.
This is a 455 Mark II Hand Ejector, 2nd Model. Notice the lack of the shroud over the ejector rod.
This one shipped to Canada in 1916. The strange marking under the thumb release is the Canadian Broad Arrow. The typical British Broad Arrow, surrounded by a C for Canada. At some point this one went back to the factory and had a new barrel and cylinder installed, it is now chambered for 44 Special.
P.S. Doing away with the 3rd lock reduced the factory price of a 44 HE 2nd Model to $19 vs $21 for a Triple Lock.