RE: Best all around varmint caliber?
Think it depends on your situation. If you are just looking to kill animals at long distance without concern for their fur and without concern for cost of bullets, then your 30-06 deer rifle will work as good as anything else. If you are working pretty close and want minimal damage to the fur and low cost ammo, then my .17HMR will work fine. But plenty of other folks are gonna want something in-between those two extremes.