I don't have that measure, but your calculations appear correct. My can of IMR 4064 is a little less dense (0.069 or 0.070 VMD if I don't shake it or pack it). I don't know what bullet you are trying to use? In the .270 with 130 grain bullets, it looks to me as if you will get more velocity and better case filling out of H4350. Your choice may be better for lighter bullets?
I think, in your shoes, rather than get the press in a kit with the Auto-disc measure, which is really geared more toward volume pistol loading, I would get the press separately and buy the Lee Perfect measure (Lee #90058) and its optional Universal Charging Die (#90273), that will operate it automatically for you. It has continuously adjustable capacity calibrated directly in CC's and has more than enough capacity for your purposes (10 CC's, IIRC?). Get a scale so you have a way to be certain of the charge weight you are throwing. Different lots of powder and powder that has been shaken a lot in transport can exhibit density differences.
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