To help minimize this you could just leave it on a shelf and not use it:O)
Not a chance, I was shooting it again today. I also shot the bronze cannon. For today I made a cardboard shield.
I went through about 40 golf balls. Most were launched with the golf ball firing attachment on my 86 Colt CAR.
I had a friend up from Portland. He brought a couple of his 37mm's and I brought one of mine. we each went through about 40 rounds of 37 ammo. Of course between launching gb's off the muzzle of my CAR I bump fired 250 rds of 5.56 ammo. All in all, we had a great, if expensive, time.