Originally Posted by
Outpost75
Cylinder throats of some Ruger .30 Carbine revolvers may be found as tight as .307-.308” diameter. Cast bullet diameter is limited by chamber and brass dimensions to no more than .310” when using .30 Carbine brass. Some users hone their cylinder throats to .312,” which enables using the same bullets as for the .32 H&R Magnum or .327 Federal. This requires use of Starline .32-20 brass, which is thinner walled to provide adequate neck release clearance for the larger bullet diameter. The New Model Blackhawk .30 Carbine cylinder does not have recessed case heads as did earlier guns. There is adequate head clearance for Starline .32-20 brass and this adaptation works very well for those users.