You can't expect rifle performance from a straight walled cartridge. Most hunters know the limitations and hunt on that. If a .58" wound is insufficient then blaze on ! If different I would love to see it.... Let's compare qround ballistics....
Whoa! Never said it would.
But you look at the ballistics of a Black powder rifle.
A .45 hawkin round ball is .440 weighing about 125-140 grain and pushed by about 50 to 60 grains of Black powder to about 1400 FPS
People have been shooting deer with this combo for well over 150 years.
Similar in ballistics to most non magnum handguns.
165 to 180 grains leaving a .40 S&W handgun at 950 to 1100 FPS.
The only concern I have is being able to hit the deer with the handgun. It has taken me years to beable to shoot the way I can with a handgun and it is a perishable skill, the less you shoot the worse you get.
You shooting a deer with the 38 Special is a great throphy. I am not taking anything away from your harvest. I am a little jealous as I did not get to go hunting this year for deer. You knew the limits of your shooting ability and were able to put a bullet in the vitals. That is more what I was trying to say.
Even out to 100 yards a large slug (.357 and up and weighing more than 140 grains) from a handgun will kill a deer.
There was a gentleman that took the pre Model 27 S&W in 357 mag hunting all over the country and took moose, brown bear and other animals with it.