I took my Alaskan moose at 300 yards earlier this year off this rest, my tripod, and the Outdoorsmans pan head. I shot him from a kneeling position with my 300WM rested on this. The first shot did the job but I put the second a few inches from it as insurance. I started out with the crosshairs wobbling over a 10" circle due to adrenaline but after a few deep breaths was able to shrink the circle to 3" or so. Adrenaline was still high at the time, but that was adequate precision.
Tonight I took a nice 160 class whitetail off the same set-up at 370yds. I was in a spot where I couldn't get closer. The buck spent 20 minutes sparring with another buck lightly. I didn't trust him to stay stationary broadside long enough to shoot until they were done. Finally with light starting to fade they separated and he offered a quartering toward me shot. I fired the 300 and dropped him in his tracks.
Having the tripod and rest let me have my rifle almost ready without having to be supporting it myself all that time. Grass height made a prone shot impossible, sitting behind the tripod was my only option. With regular practice I'm able to make shots like these with a 300WM that is under 8lbs with scope, ammo, sling, everything ready to hunt. With a heavier rifle it's even steadier. The pan head lets me fluidly track animals while waiting for that shot, or locks down to hold the rifle until it's time to get on the scope.