Most accurate bullet in all my Supers is the Hornady 124 grain Flat Point...it is a .355 diameter bullet.
As to factory ammo, everything I have ever tried has been accurate. The Winchester ammo is loaded with the same 130 grain RN bullet that they put in the White Box .38 Special, which is a .356" bullet.
boatanchor..don't know what kind of gun you are shooting but if it is a Colt made before 1990 it will have the headspace on the case rim style chamber which do preform better with the larger diameter bullets. Exchange it for a newer heardspaced on the case mouth barrel and you may see a significant increase in accuracy with all loads.
Bob
