Lots and lots of variables --in all of this..even the difference in recoil between the 2 calibers he is using can make a bit of a difference...think there is no doubt you can get a faster follow up with a double..but what if, as all things in life don't go as planned, you need a 3rd and 4th shot..like in a herd of elephants..they get pissed when you just dropped their buddy??? Have seen that happen... also I have shot bolts my entire life--doubles, not nearly as much...

Ripp