Deputy Dog said:
I think you had better hit them in the head or there won't be much left to take home....
Same thoughts, unless you get your powder charges way down low. I'm shooting 30, 32 and 36 caliber for snowshoe hare (as well as reduced loads in 50, 54, 58 and 62 cal), and if your shots drop down even into the neck at velocities higher than 22 LR, you'll lose the whole front half of the animal to blood shot. I'm using 10 grains of 3f in my 30 and 15 grains in both my 32 and 36 (30-35 grains in all the bigger stuff). But I'm planning on cutting the 30 even lower, and the 32 and 36 down to 10. Even at 22 velocities, hitting with the smaller ones is like hitting with an already-expanded 22LR or worse.
Here's another angle on the question for you:
Knowing that you can drag down the powder charges on almost anything to use it for small game, are there other things you can do with hot charges in the same caliber? By that I mean, if you snort the 40 up toward max, is it suitable in your mind or legal in your state to use it for deer?
I'm having a Leman Squirrel Rifle built, and it's in my choice of 40 or 45 caliber. Pondering that question of high power capabilities along with low power, I've settled on 45 caliber for my "squirrel" rifle. I'll certainly be using 15 grains or so for snowshoe hare with no demerits for being so "big" on small game. But when I snort it up toward top loads, it will be both capable and legal for deer here. Not so with a 40 or the smaller ones I already own.