I'll try:

17 Hornet
223 Tikka T3 Hunter
6mm Remington
308 Tikka T3
338 Federal or 9,3x62

I'll use Seafire's data to download my 223 loads to 22LR, 22 Mag and 22 Hornet.

The 6mm Remington and 338 Federal are barrels for my R8.

The 338 Federal could be replaced by the 9,3x62 R8 barrel and would really up my game.

There are 2 rules to success:

1. Never tell everything that you know.