I have a Reflex Buckskin with 50-60lb limbs set at 60lbs wit a Muzzy drop away rest. Chrono speed is 286fps. The last deer I shot was a complete pass thru at 12 yds and the broadhead was completely buried in a tree on the other side of the deer. A 60lb draw bow properly set up ,and used at appropiate, ranges can kill just about anything you want to kill as long as you can put the arrow in the right place. For a grizzly I would suggest a firearm backup and/or hunting from a tree stand.

HH