I tried today, I really did. Forgot to grab a backer from home, but I found a piece of cardboard in the trash which I thought would do. I found out (sadly) that not all cardboard is the same. While the holes in the cardboard were nice and round, those in the target (25 yard) were badly ripped out. Also, while halfway through my shooting, the guy who was mowing stopped for a gab session. After he left I had lost track of how many shots I had taken and when I retrieved the target it had 6 holes, all ripped out. So, it looks like I'll be back out next week for another try!
~Kees~