They are not meant for firing anything over standard pressure .44 special loads, and will stand up to limited shooting just fine, I'd imagine. They are pretty thin cylinder walls though. I have read online that people have gotten away with firing heavy loads through them without bursting a cylinder, but that the guns quickly shoot loose anyways. This is not a suggestion to fire heavy loads. They are definitely a "carry more than you shoot it" type of gun.
Edit: To the guy who posted below me, exactly how many rounds of those did you put through your gun? If you don't think a bulldog can shoot loose, mine would probably change your mind.
"This ammunition is for use in ALL 44 SPL and 44 MAG. firearms except the Charter Arms Bull Dog. No, this ammo won't blow up your Bull Dog, but if you shoot more than a few hundred rounds of this ammo in a Bull Dog,
the gun will get looser than it already was, will go out of "time" and stop working." (lol, "than it already was")
https://www.buffalobore.com/index.php?l=product_detail&p=271
You "know several people" who shot "many" .44 mags through their Bulldog pug? And the OWNER of the company said"not to worry about how much 2400 powder you were using"? That seems to me to be about the WORST advice someone could give in that situation.... Honestly, I would hesitate to post that on here as it could be EXTREMELY dangerous if someone has an old bulldog that could actually chamber .44 magnum and decided to try.
Buffalo bore recommends their "heavy" .44
special loads NOT be fired in the Bulldog. NOT. for all other modern .44 special guns, fine....but NOT the bulldog pug. PLEASE DON'T TRY .44 MAGNUM LOADS EVEN IF THEY FIT.