my Glock 17 is almost as accurate as my 4" Ruger GP-100 with careful slow target fire, including the use of a sandbag ... and Glocks are supposed to be merely "combat accurate".
Now my super red hawk with a 9 inch barrel and a scope is the most accurate handgun I own. With a sandbag, I can make 1" groups at 50 yards.
But when it comes time to put 5 rounds on target in 3 seconds, I am much more accurate with that Glock than I am with any of my wheel guns. Same with my 1911.