I began to understand the importance of knowing your throat diameters but have yet to slug them successfully. I am trying to slug my Ruger Blackhawk. The Lyman cast boolit manual says to use a pure lead ball that is several sizes larger than the caliber of the pistol to be slugged and push it through the throats with a wooden dowel rod. I used a .451 lead ball that I shoot out of my Dragoon. The problem was, I and had to beat the thing with a hammer to get it through the throat. After getting it out I miked it and it read .4324. That seems pretty large and I figure I messed up the slugging process with all of the beating with the hammer.
What is the best way to slug the throats? I'm tired of having to beat something through with a hammer and not getting an accurate measurement.
Thanks for your help.