We all have our favourites so here is mine

222 - Tikka LSA 55
7mm08 Kimber Montana for the dense New Zealand bush
280 Ackley Improved Sako Finbear - for open country, mountain & plains game
9.3X62 Simson for larger game (not hunted with it yet)
One day I will own a 375, a 10.75X68 & a double rifle in 450 or 470.