Yep, Hornady calliper is fine.
Could your powder have gone bad? How old is it? How's it been stored? Has it been left open at any point? The electronic scales are shite and drift all the time but mine never drifted more than about 0.2gr. If yours is similarly crap, this doesn't account for the missing 200-300fps. Bad powder could...
I recall loading for a Howa Mini with 123 ELD-M's and at 28gr of 8208 I was seeing the onset of pressure signs with speeds above 2400.
Do you have any other powders on hand that you could try?
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