The cartridge became incredibly popular in the silhouette game, due to it's ability to take down the rams, coupled with mild recoil, and excellent accuracy. There is no way of knowing how many have been made, but it's for sure in the top 10, probably in the top five. The .22 lr, and the ubiquitous .30-30 are likely more common, and maybe the .357 & .44 mags. There's no way to tell. But, the main reason you will see a large number of them for sale, is simply because there ARE SO MANY of them out there. FWIW, I have one in 10", and love it. I use the Nosler 120 gr ballistic tip, and just go hunt. Except, of course, when I'm using cast bullets. I wouldn't hesitate to use it on anything here in Texas. That includes 400# hogs. It ain't an elk cartridge, though. Were I to hunt 'specially fo varmints, I'd go to a lighter, hollowpoint bullet for more speed & frangibility. JMHO,,,,,,,,,,,,,,Bug