Howdy Grunt,
I haven't seen any mention of an issue unique to the 45 colt and Ruger cylinder throats. Although the issues are not confined solely to Ruger revolvers. If you are interested I'm including some links to some good articles on the subject. I have first hand experience with this as my own NM blackhawk had issues right out of the box. My barrel slugged .451 dia. while my cyl throats were really tight ranging from .447, .448, .449, and .450 measured with pin gauges. Needless to say accuracy from factory ammo as well as my handloads was lackluster. After sending my cyl to have the throats reamed to .452 my accuracy woes are gone. Here are the links;
http://www.beartoothbullets.com/tech...h_notes.htm/72 and from John Linebaugh;
www.johnlinebaughcustomsixguns.com/writings
John
