Range finders are pretty much useless since they don't measure wind velocity. Its unethical to shoot at a game animal when you don't know how far right or left your bullet will land.
You should stick to the MPBR of your rifle or just a little more. Out to 300 or 350 yards bullet drift is reasonable unless you're in strong winds. Beyond that you're just gut shooting animals for sport.
Learn how to get closer instead of how to shoot further.
Just my opinion but I think its valid.
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Keith
The Bears and Bear Maulings Page:
members.xoom.com/keithrogan