I'd sacrifice a spitfire into a new piece of plywood and see for yourself what it looks like coming out the backside.
If oyu have a great shot that is double lung and/or heart you are going to have a Bear skin rug in short order BUT if you get a little foward and get the shoulder blade then things are going to get "interesting" in a hurry.
I want to KNOW what my head is going to do in less than perfect situations. I shoot Muzzy's and when I was selecting broadheads for my first Elk trip this is what I did.
8 to 10 inches on the other side of a 3/4 inch piece of new ply and the arrow was still true left nothing to my imagination on a mistake by me.
13 years later no reason for me to change.

Good Luck Taz and I can't wait to see your Bear!


Greg

"Getting close to the game is the joy of Bowhunting for me, the harvest is a bonus."

Live 15 ft Python after eating a small Antelope!