Birdbustr,
This may be a late reply to your query however I just got back from a fine caribou hunt in the Ungava. I shot 5 caribou, 2 broadside 265yds and 319yds, one frontal 186 yds, one quartering 218yds and one running front quartering 113yds. The rifle is a Sendero 7mm Rem Mag, the ammo 150gr Scirocco.
After autopsy, the 2 broadside shots exited with lung matter, the caribou stopped in their tracks, The frontal was a little offset so the shoulder got fragmented before the heart blew up (shooting down the mountain), the quartering’s lungs were liquefied and a fist size hole was apparent on the opposite side, and the running front quartering, despite the lung-shoulder contact was finished with a neck shot 20 seconds later. The first bullet went right through.
My humble conclusion is that I was over bulleted. The 140gr Accutip would have been a better choice; less meat loss, faster expansion. The 7mm RM is a lot of gun for these caribou. They are big (550-375lbs) but they are not moose! My hunting partner shot 150gr SST Hornady .308 with less damage despite their muzzle velocity of 3000fps.
Kindest regards.