Awesome thread, OP!! Definitely can't recall all of them, but here is as best I can recall.
Target flies: .BB gun, .177 air rifle, .22LR.
Rabbit: .22LR, .410, 20ga, 16 ga, 12 gauge.
Squirrel: 22LR, .410, 20ga, 16ga, 12 gauge.
Pheasant: .410, 20ga, 16ga, 12ga.
Chukkar: .410, 20ga, 16ga, 12ga.
Tennessee Reds: 12ga
Duck: .410, 20ga, 16ga, 12ga.
Varmints: .177 airgun, 22 cal airgun, .22LR, .223 Rem, .22-250 Rem, .244 (6mm) Rem, .25-06 Rem, .257 Wea Mag, .270 Win.
Whitetail deer: .244 (6mm) Rem, .25-06 Rem, .257 Wea Mag, .270 Win, .308 Win, .300 Win Mag, .300 Wea Mag.
Russian boar: .270 Win, .375 H&H Mag, .444 Marlin, .45 ACP, .45-70 Gov't.
Ram: .300 Wea Mag
That's as close as I can recall. The case of the .270 Win used on Russian boar, was actually shot by my friend, as he hunted with me. He borrowed my rifle. Never in my life saw a boar drop so fast, as those 140 grain projectiles!