SIG P220s are adequate with the later "American" (actually Georg Luger) left-side magazine release button, but a Colt Goverment Model .45 that consistently achieves 25-yard "5 consecutive in the 'X' ring" accuracy in an unsupported standing (no cheating with your gut resting against the Koko Head shooting bench) position is quite adequate, thank you very much - especially when it does so with its rust-pitted original barrel and no tuning whatsoever.  (Try 7.5 grains of Alliant (Hercules) Unique with the classic 200-grain H&G #68 at a c.o.l. of 1.265" or to relax with, 4.8 grains of Winchester 231 (Hodgdon HP-38) with the same.  The key is to headspace on the bullet shoulder, not the case mouth).

Now on to see if a new SIG 10mm will do half as well. . .