Ruger BlackHawk Screw In Barrel Question

[goldenboyx7 0]

I "inherited" this 7 1/2 inch (end to end) stainless BlackHawk barrel and there are no markings on it that indicate what caliber it is. I don't have a BlackHawk pistol. but when I inserted a .45 Auto bullet into the barrel nose first, about 1/8 of the copper is showing between the barrel and brass. This leads me to believe it is either a .44 or .45. Any ideas on how to determine what caliber it is without having to consult a gunsmith? It's also for sale if anyone is interested.

 

[djg0770 481]

Slugging the barrel (pushing a soft lead slug through the barrel) will definitely determine the exact bore size.