I have been shooting 25 yds or less b/c I don't have a safe place to shoot beyond that. However, it is time to start practicing up to 40 so I need to develop a backstop for the occasional "flyer". With my old bow, 54 lbs of KE, a 1/4 inch piece of plywood worked, though probably not great for the arrows. My new bow is 66 lbs and the plywood won't stop them.

I was thinking a heavy rubber mat might be a possibility but figured you guys have tested a lot of things so I am interested in your suggestions.

thx.