re: #338 Decatur Deb
I’m remembering about 20m, if the damn thing arms at all. Big chunks of the Knox ranges were red-boxed because of Cobras in the ’70s.
There is that problem. I only ever shot the blue ones that powdered on impact for a “poof” cloud to show where you hit. We were never allowed to use the real boom ones because they didn’t want to mess up the live fire ranges with duds. (early-mid 80’s).