I keep GA Arms .44 Special loads for PD in my 296 and it's HKS #CA-44 speedloaders, which also fit my 696. As I have speedloaders to fit all of my DA revolvers filled with SD ammo, my #29 speedloaders also carry that ammo for my 629s. It is about the same (~$22/50) as the Al-cased Blazers with the same bullet, I'd rather get the GA Arms version - you gain a nice once-fired Starline .44 Special case. I've chrono-ed them at the same velocity, too - from a 2.5" 296 (805 fps), 3" 696 (835-840 fps), and 4" 629 (875-880 fps). Speer claims full opening at 800 fps in gelatin, while a famous forum poster has shown .75"+ OD expansion in brisket. Some others posted the same for ballistic gelatin. The boot-gripped 296 will say howdy when you light them off - my 296 has launched ~ 2,100 of them.
Note... I did try some of my usual well-crimped 240gr LSWCs (740 fps from my 3" 696.) in my 296. By the fourth round shot, that fifth one's crimp was straightening out. If it had been a six-shooter, it'd have likely jammed on the sixth round. The greatest length increase from 'crimp-slippage' in a 200gr GDJHP, mine or GA Arms, was .002" - acceptable. They should be fine in a CA Bulldog. Note: I had an Al-cased Blazer burst in my 696 - after over a 1,000 such were shot. No more for me! My homebrews were the Speer #4427, same bullet, over a mid-point, from Speer's data, 5.7gr Titegroup in a .44 Special case for 804 fps from the 296. I believe it is one of the purpose-built low speed/snubby rounds.
Stainz
PS Speer designed the #4427 for .44 Special use, with full opening by 800 fps and not to exceed 1,000 fps. They have higher velocity-rated .44 GDJHPs - for .44 Magnum use - where a 200gr 1,100 fps round would fall (ME = 536+ ft-lb!).