If by "varmints" you're talking prairie dogs at 100 plus yards, etc., no, the mini isn't accurate enough for that.
Coyotes to 200, sure.
If you don't like to work on your rifle, pass it up I think. Mini needs a little work to shoot good.
I just picked mine up (SS RR 14) and put 300 rounds through it Sunday. With the lighter bullets, it's shooting 2.25 moa average with a horrendous trigger. That was the average of 5 - 4 shot groups for each brand of ammo tested.
Trigger was sent out yesterday for a 3.5 lb job, and I will glass bed the action, and redo the gas block and bushing this weekend.
If I can get it to shoot 1.5 moa or less with just a few cheap mods, I'll be pleased, and will have a great calling rifle. But, I'm under no illusions of picking of prairie dogs at 100 plus either......But it sure is a handy rifle for my type of calling with normal shots from 10 feet to 150 yards.
If you want some good info on the mini, what can be done to it to make it shoot decent,
try this page .
The mini is a good gun, as long as you know what to expect and can accept that.