In the late '70s - early '80s when I was heavy into handgun metallic silhouette shooting, any International-class shooter could shoot 4-5" groups at 200 meters from Creedmore position with a properly set up open-sight Unlimited gun and often with their Production gun.
I recall an International match where 60 shooters shot 80X80 scores in the Unlimited class. The shootoff was snuff cans at 150 meters. We taped the cans upright on the target stands. A hit produced an impressive cloud of chew!
I don't recall how many cans the winner hit in a row, but I know it was over 15.
I got 11 with my tricked-out XP-100 in 7IHMSA before I missed.
I still have my Wichita Production gun, but haven't fired it in years.