First of all, awesome thread. props to the OP. Secondly, awesome photos. One of these days I'll get around to taking a few of mine and keeping them handy for these purposes. I especially loved the BAR and that old Stevens .22 from alemonkey. Is that a rolling block?
My faves are based on what I'm doing, where I'm at, and with whom I am shooting. For pure plinking and out-scoring the buddies at the range I can do no better than my 10/22. Ten shots inside a ragged dime-sized hole at 50m always puts a smile on my face. And I can do that all day with some pretty cheap ammo. For creating massive holes and blowing up old cans of expired food out in the desert with the pals or the fam, my 44 Mag Vaquero with some 240gr semi-wadcutters loaded on the upper end always make a nice mess.