I agree with everyone else.

I would try to use a target that wouldn't hurt the blades.If shooting into a 3-d target the spiral design on the extremely dense target will sometimes bend the blades after extended use.I havn't had this happen on live game but it does on hard foam.

Try using 2"-3" foam targets and it might take a couple to stop your arrow.Even if they go thru you should have slowed them down enough to retrieve your arrow.The foam isn't as dense and it has worked for me.Tuff Spot by Mckenzie is one I have used.Also a milk jug full of water and a piece of 2" blueboard to back it up works very well.