I have a bunch of 45-90 Starline cases left over from my 45-90, that I just sold. My Farmingdale Sharps 45-70 has a chamber measuring 2.119 in length. I would like to use the 45-90 cases and trim to the precise length. Would a copper tubing cutter work to remove the greater segment and then use a case trimmer to finalize the operation. Or, any other suggestions.