Dumb? Maybe only to the ignorant. Though I sense another pearls before swine event looming I'll procede anyway.
There is such a thing called reloading.
Most handgun hunters I know reload. That tends to let you select the best burn rate of powder for caliber and barrel length.
Given though you can only do so much with any one combo in a pistol.
Let's do a simple Apple to Orange comparison with a rilfe round .308Win. in a pistol and a pistol round .357Mag in a rifle.
We will use fairly close bullet weights 158grJHP for the .357Mag and 165grSP for the .308Win.,.
In looking in my Lyman #48 Reloading Handbook we have the following:
.357 Magnum: The very best max load veloctiy is 1774-fps using 14.9grs of AA #9 powder out of a 20"bbl Winchester 94.
.308 Winchester: The very best max load velocity is 2484-fps using 47.0grs of N150 powder out of a 15"bbl T/C Encore. That put's it in the base load range for it in the rifle section of the Handbook. Not too shabby for a pistol eh?
Now it could be said that it's unfair as the 20" rifle length barrel might slow down the pistol round. True and you might be able to get an optimized length barrel for a either a registered SBR or an Encore pistol and maybe get a velocity between 1800-1900fps for the .357Mag.,. But I just used common barrel lengths in both platforms as examples and in calibers I am familar with.
Whether or not this means a rat's ass to anyone here I could care less. The main point for a handgun hunter is a combo of accurate shot placement and enough energy to get the cleanest kill possible. After he has honed his shooting skill to make a shot like that.
I would tend however not to use a single shot hunting handgun in an all out survival situation. Due to human factors such as stress, fatigue, injury or illness a steadier platform like a 16"bbl light weight carbine in .308 Win. might make a better choice.