I just about get away with this, but it’s not great. I’ve got a 45lb recurve & at 30m the arrows will go through that foam about 6” into the bale. I should of gone higher with the bales as loads have gone over, but haven’t had to worry about a wall, though my chickens had a few close shaves! ? The problem I also had was tips coming out in the foam.
I wish I’d got a proper target backing, but I’d spent enough on the bow at the time. Atb