Nothing at all wrong with the "old" calibers. I've used the 30-30, 30-40 Krag, 30-06, 45-70, 6,5x54 MS, 9,3x62 and the 375 H&H. All of them are over 100 years old and they work just as well know as they did then. The game isn't any tougher but the guys that market new fangled cartridges won't admit that.

Put a bullet from any of the above rounds into the chest cavity of any deer, elk, bear etc... and you can get the skinning knife ready.