I remember having a pretty good deal on some winchester wildcat hollow points on sale at the local hardware store waay back in the mid-1980's
I used them for hunting racoon.
One night the hounds were hot on some coon and treed them in a great big ole cottonwood tree next to a shelterbelt of trees.
Three winter prime racoon way up in the tree (chrustmas tree we called it) the eyes gleamed and blinked like christmas tree lights, my younger brother and his school chum used semi-autos to try and knock the coons down but they learned using the spray and pray method of hunting and didnt have any luck dropping anything.
After they both ran out of cartridges, all that was left was the cartridges I had in my pocket (.34 gr wildcat hollow points on sale specials)
I used my Marlin Glenfield model 110 single shot to pick the three out of the upper branches.
All were head shots.
The coon dropped right out.
It was later on we loaded the coon in the truck and headed home with the dogs.
Funny thing was a about 4 miles down the track the dogs in back started kicking up a fuss.
Those hollow points just slpattered on the coon skull's knocking them out and we had 3 groggy raccon milking around in the pickup truck box.
Those hollow points never entered the brain pan, they splattered on the skull knocking the coons out.
Use 40 gr std velocity for peneitration and low noise.
That was happeded way back then.
So today you could have quite an arsenal in your favor.
Id pick up any and all types of CB, BB rimfires, std velocity short, high velocity short, .22 long std velocity and long rifle as well as high velocity LR and see how they penetrate a block of green firewood at various ranges.
Maybe pick up a couple air rifles.
Like a mid price .177 cal break barrel and an assortment of pellets.
I can tell you will need to be close and have power to get a .177 wadcutter pellet to penetrate anything, dome would be little better.
For a killing type air rifle pellet your going to have to have a spire tip type if you want penetration.
You could invest in a upper mid price .22cal or bigger air rifle .25cal as well.
Test them at different ranges.
Too far out the velocity bleeds off enough you wont get the penetration your looking for.
So know the type bullet your slinging.
And its effective range.
Just because you can hit a target at long rang does not mean you can kill it.
And what does all that long winded stuff I just said mean?
Spend some time shooting real critters at various ranges.
You will learn what works and what wont work for you.
Might invest in some good quality optics.
Thats just my 2 cents on wounding and stunning furry critters that dont like being killed.
Imagine a bad shot knocks a eye out and it escapes, but it will never end up in a sympathetic persons yard it will go straight to the community blabber mouth bunny hugger neighbors yard and lays there looking as near death as possible gasping its last in front of their back back patio door.
You can bet bunny hugger is gonna raise a stink n call cops the game warden and the 6 O-clock news, tweet to everyone who will listen and facebook all about it in graphic detail.
And why would I say all that?
Well I know a certain pair of fellows that had to do a little jail time for something like that.
In Northeastern Nebraska.
These fellows have some serious jingle invested in nv optics.
A good way to hone your skills?