Good point, Carl. We don't want to use a powder in "the big hole" that would give marginally low pressure even in the smaller 12 gauge hole. 700X is an example of a correct burning rate for one ounce loads in either gauge. 7625 might be OK for one ounce 12 gauge loads, but maybe a little slow for the bigger hole, especially in winter. Some low pressure loads look good on the charts, but don't "sound" too good on a cold winter day. On a related subject, a couple of years ago, I did some freezer testing on the lowest pressure RST loads. I was unable to find an "off sound" or bad performing example. I can only say "How do they do that?
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