If you want some 1x fired .270 brass, I have a fair amount I'll sell you for cheap. Most is Remington to boot.
But to answer your question, unless your loads are at the max loads for the charge weight, no, it's really not going to make a noticeable difference if the Remington case is .0001 cc more or less in volume than a Hornady or Winchester case.
Keep in mind that many reloaders are OCD, which makes for great reloads, but often the processes and procedures one reloader goes through is not necessarily a requirement for every reloader.
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