Any difference between the .308 and 300 WM? Absolutely not - except the 300WM may weigh up to 2 lbs. more and be two inches longer. It comes down to your proficiency with a quality bullet. As I am looking forward to my 20th elk later this year, I will be carrying a 6.5CM again to confirm last year's two successes - a caribou and cow elk. Both with a 143gr ELD-X at 2700 fps..
Might need to add 30 carbine and 300 blackout as the same then .
