but I decided it just wasn't worth it to spend all that money and effort to end up with an expensive gun in a basically moribund caliber I don't reload for that's not well supported by the ammo makers.
Moribund huh? As this gentleman cleary stated, he does not shoot the .44 special or apparently know the status of this great round in today's world. While he has suggested that the .44 special is near death, even obsolete, and that nobody supports this round in the ammunition industry. I would suggest that given the fact that there are more loadings and manufacturers making .44 special ammuntion today than ever before, that this cartridge is far from moribund. Take a minute and go online, you will find everything from cowboy loads to personal protection to heavy loaded hunting loads. All of these are commercially produced. As for handloading, it is by far one of the most accurate and enjoy cartridges to load. Spend a little time reading Elmer Keith, or more recently John Taffin on these subjects and this caliber. I would also point out that Elmer Keith's .44 Special load of 250 grain bullet at 1200fps produces 800 ft lbs of energy... this load is comfortable to shoot in my model 24, and as the model 21 is a "modern" copy of that, I would say that it should perform well in that as well. Not that you really need this much punch, but it definately has the potential to speak with mounds of authority.
A quick internet search discovered the following loads for the .44 special, far from a lack of support I think...
ProLoad's 200 gr. Gold Dot load going 900 fps
Winchester's 200 gr. Silvertip going 900 fps
Federal's 200 gr. SWC going 900 fps
Speer's 200 gr Gold Dot load going 875 fps
Georgia Arm's 200 gr. Gold Dot load going 850 fps
Cor-Bon's 165 gr. JHP going 1150fps
Buffalo Bore's 180 gr. JHP going 1150fps
Buffalo Bore's 255 gr. Keith style SWC going 1150fps
Black Hills Keith load 250 gr. going 900fps
Glaser Safety Slug 135 gr. going 1350fps
Master Cartridge Corp. 240G grain JHP going 900fps
Winchester's 246 gr. LRN going 850fps
Winchester's 225 gr. LFP going 750fps
PMC Cowboy 240 gr. LFP going 750fps
Magtech 240 gr. LFP going 750fps
Ultramax Cowboy 200 gr. LRN going 700fps
Hornady Custom 180 gr. LRN going 800fps
3-D Ammo by Impact Arms 180 gr. JHP going 900fps
3-D Ammo by Impact Arms 200 gr. LRN going 750fps
Bullseye Ammunition 200 gr. LRN going 850fps
Magsafe Ammo +P Defender 92 gr. going 1,620fps
Magsafe Ammo SWAT (Urban Warfare) 94 gr. going 1,500fps
Conley Precision Cartridge 210 gr. LFP going 700fps
* All velocities are published, I have not verified them personally.