I have been up to Quebec for caribou a few times and any setup suitable for deer will suit you fine for caribou. If you are making any changes keep in mind that your shots will be typically longer than on deer here in Ontario. I would work on up to 50 yd shots. Caribou are not as big as many would think. A good bull will weigh less than 300 lbs on the hoof and most will be closer to 250 lbs. The long legs and and bigger racks make them look a little larger than life. For example my last bull skinned and with legs cut at the joint and head removed weighed 162 lbs. Also realize that they really have no where to hide after the shot if you're above the tree line in Aug/Sept and if doing the winter hunt in Nov/Dec then you are on snow and in many cases in treed areas. Feel free to pm if you want more info on bou hunting.