Don't know much about brands but definitly would go with the type you insert in the end of the barrel and has a piece that sticks up even with your scope. Those lasers are crap my cousin had to move a .450 marlin 74 clicks to the left and 52 clicks up just to sight the rifle in after having it laser boer-sighted.
The magnetic boresighter by Leupold is suppose to be excellent. I have never used a boresighter of any type because I have all bolt actions and can look through the bore with the bolt out and get my gun on paper that way. I then shoot at 50 yds to get close before moving to 100 and beyond. This will get you real close quickly if you are using a bolt action.
Wind is one of the most crucial variables in any kind of big game hunting. It helps level the playing field between a hunter with a scoped rifle and the game animals being hunted. This is not novel information. Any hunter who has consistent success in the field knows this. I have tried a couple different techniques for keeping track of the wind. Here are a couple.
The most simple and obvious is to just stay cognizant of it. It is amazing how slight of a breeze you can sense if you just pay...