For another thread on the SIG forum (about the comparative accuracy of the SIG P220 .45 versus M1911 clones) I posted the following list, all .45's, from Gun Tests.
[Average Group Sizes]
SIG P220 1.9" [smallest 1.3"]
H&K USP45 2.0"
SIG P245 2.1"
Colt CCO 2.2"
Kimber Ultra Elite 2.2"
Ruger KP97DC 2.2"
Springfield Ultra Compact 2.2"
S&W 4553TSW 2.5"
Beretta 8045F 2.6"
Glock 36 2.7"
S&W 4566TSW 2.7"
Springfield Champion 3.0"
Sistema Colt M1927 4.7"
They've tested other Glocks that grouped as small as 1.7". So this doesn't answer your question directly, but it's in the ballpark. Hope this helps.
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