Model 14, I would do a search here of pin gauge or gauge pin, and cylinder throat for starters. This ground has been covered lots by thoughtful fuys. Note that pro bullet casters offer several different diameters so that you can purchase specifically for each of your guns, two different .44's, for instance. Also, jacketed bullets are not copper. They are yellow brass or some such alloy, containing copper but quite a bit harder. You are partly right in your surmise about copper itself though: Rainier, for instance recommends using lead loads for their copper plated bullets. I find they require a bit more tho to perform well.
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