RE: What is the best Calibre for Sheep/Goat Hunting
Big Horn Sheep & Mountain goats are small animals. The weight of your rilfe IMHO is more important than the caliber.
I have hunted Big Horn Sheep in the past. I used my Remington Sendero chambered in 7mm-STW. I hated the extra weight but took the rifle for it's accuracy.
On my next Big Horn Sheep hunt I will be packing a ultra light rifle. My caliber of choice will be either 270-winchester or 280-remington.