I shot a moose in '07 with a 60# recurve and a 29" Beman MFX that weighed in at just about 600 grains with 225 grains of Razorcap broadhead. The arrow broke a big chunk of the "elbow" that covers the heart, took out the bottom of both lungs, took out the heart, shattered a rib and stopped when it hit the offside leg bone. The moose went 3 strides before dropping. The arrow was undamaged. So, what I am saying is, your arrows sound good to go. But, having hunted in that part of the world for caribou, I think you need to practice out to 40 yards or better because you are more likely to get long shots than short ones, IMO. If you take out the weight tubes you will still have plenty of arrow weight and will be better able to make a longer shot if needed. Just my opinion.