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Well, Ruger did come out with the American .22/.22WMR and I see those rifles as replacements for the 77/22 series. But I do not see Ruger or anybody else coming out with bolt rifles, or semi carbines in the rimmed revolver cartridges.
I believe there is indeed a market for a modern .44 (and possibly .357) lever like their defunct 96/44. Not all those lever rifles sold by Henry, Rossi, Taurus are going to cowboy shooters, some folks are indeed hunting them.
The issue I believe, is Ruger cannot make that series and still produce the profit THEY NOW DESIRE. Similarly, Ruger could certainly produce a .44 American Ranch, and likely affordably, as cheaper production (higher profit) was what was driving the American series anyhow.....but they do not foresee the sales in sufficient numbers (in .44) to achieve the profit......they now desire.
The .450 BM cartridge is new and exotic, and also has a niche in the pistol caliber only deer states, and has the AR crowd as an driving force. I believe Ruger has decided that the rifle will sell based on those (and likely other) reasons and is producing the BM Ranch. You can get into the BM cartridge for less than $400 bucks w/ an American Ranch. The BM exceeds .44 mag ballistics by quite a bit. And most importantly, Ruger can make a BM Ranch for about the same cost they can make you one in any other American series caliber. For awhile, they will sell, and Ruger will profit....at the level they desire!
Wasn't always that way though. Ruger often made firearms because Bill Ruger Sr. said they would. The profit may not have been there AT THE LEVELS THE BEAN COUNTERS DESIRED.....but the Old Man was going to make the gun, cause it was HIS company. Old Ruger made some interesting guns, and for the most part, they are all gone. Yes, Bill Ruger made some dicey deals and comments in the recent bad years of gun law. But Bill Sr is gone, and I do not see the family name anywhere on the list of "key people" anymore.
As for reintroducing past products.....don't think so. Has New Ruger brought back any discontiued series? Don't think so. We will never see the .44 carbines of any guise (unless in the American and not likely), the N0. 3 carbine, certainly not the Old Army,....add your own favorite. I predict the Mini14/30 series is next BTW, and the No1 is not long for this world either.
Wouldn't it be nice if Ruger made the .450 BM available in their AR platform?