I agree!
Most all the .44 special gel tests I've seen are being fired from larged .44 magnum revolvers with much longer barrels.
The only gel test I've seen where they used a Bulldog with 2.5" barrel, was a Hornady demonstration of their 165 grain Critical Defense load. Penetration was only 10.5" though and that was in bare gel. Not the best performance methinks. Here is the product page, the video can be seen in the video tab:
http://www.hornady.com/store/44-SPECIAL-165-GR-Critical-Defense/
As you can see, in the gel blocks they show and in the video, this round underpenetrates though it doesn't seem to be bothering Hornady LOL!
I have been in contact with two companies, Underwood Ammunition, and Cor Bon. Underwood offers a load called the "Bull Dog" made specifically for Charter Arms .44 specials, and it's a 200 grain GDHP bullet in a brass case that is a step up in velocity from the Blazer or Speer loads. It's designed to were it will be fast enough to expand from a Bulldog, but not so hot as to hurt the gun. They are out of stock right now, and I messaged them asking them to make some more. They said they've had some trouble finding the GDHP bullets to load the ammo, and said they are looking into making a batch of Bull Dog loads using Nosler 200 grain hollow point bullets instead. I'd prefer the GDHP bullet but I'm still going to buy several boxes of this load when Underwood finally makes some again.
As for Cor Bon, they make a 200 grain all copper DPX load that has gotten rave reviews, and seems like it will perform great from a Bulldog in the research I've done. I also messaged them, and they said they have gotten several requests to make a run of that load and to check back in about 90 days so hopefully they are making some. This is a warm load, but I think it should be okay in the Bulldog for light shooting and to carry.
Alas, finding good performing .44 special hollow point defense ammo for the .44 Bulldogs is quite a chore. Just not many options...