well, i ignore what ruger does as they've quit making any sense to me at all. why the 44 in the single actions but no 454, 475 linebaughs in those make no sense whatsoever. that said, when i got my first casull, a raging bull mistake there was a taurus 454, 44 and a ruger 454, ruger and smith and wesson 44 mags customs and the FA crew. now there's bfrs which are as good as any, the two big smiths and all the above except the ruger 480 which made no sense to me. sooooo now we've got for factory choices
1) 4 choices for 454's, a great choice for perhaps the most versatile caliber in a normal size gun. elephants to deer and coyotes with these boys and great trajectory.
2) well over 6 or 7 choices in .44 mag, truly all you could ever NEED.........but want is a different thing, hehe.
3) 2 factory 475 linebaughs the superb FA and superb BFR. hard to find a better choice period if you're after the big stuff.
4) smith 500's -- taurus, bfr and smith all offer us big choices in the biggest of the big.
5) smith 460's -- most versatile cartridge in a big bore handgun imho. choice of smith and wesson and bfr. also counts as more 454 choices as they'll all shoot them as well as 45 colt.
6) now throw in the wildcard big bfr's with the 45/70, 450 marlin. gets crazy if you load them up high.
now throw in the high quality custom makers and just factory makers bring the count to around 20 big bore factory choices. about 14 or 15 non 44 mag choices. when i bought my first in the mid nineties there were about 3 or so non 44 mag choices that i knew of. seems with the silly exception of the .480 ruger circus (which would sell like hotcakes in a blackhawk with a 5 shot 480 and 5 shot 475 cylinder in a pistol pack and a 5 shot 45 colt and 5 shot 454 cylinder and ruger probably double they're profit margin in one year LOL)
there's more choices than ever.