About a week ago I shot some steel targets silhouette angled down (223 AR) with a guy that was an instructor. Not just an average instructor, but someone with a pretty lengthy resume. We were maybe 25 yards away. Really fun and so I went out to buy my own and I'm seeing that min safe distance is at least 75 yards. I'm not sure our exact distance, but we were definitely closer than 75. Is 75 yards just extra cautious?