Good question..Most accurate 9mm I've ever owned was a Sig P210...It was so accurate it was scary! It came with a test target dated 1988, 8 shots, 50 meters, 1 1/2" group..I never shot it past 25 yards, and could do 8 shots, 1/2" group. It was like shooting a scoped rifle...
Never really found an accurate 40 cal pistol..for me, shooting a 40 did not produce groups, just patterns!
Most accurate .45 was a garden variety Colt Government model, nickel '70 series, and again, it would do 1/2" groups, 5 shots, at 25 yards...
All of the above shooting was with eyes that were about 15 years younger! LOL
Never really found an accurate 40 cal pistol..for me, shooting a 40 did not produce groups, just patterns!
Most accurate .45 was a garden variety Colt Government model, nickel '70 series, and again, it would do 1/2" groups, 5 shots, at 25 yards...
All of the above shooting was with eyes that were about 15 years younger! LOL