Had a x39 that .314 was .003 too small .yep.
314 being over size is subjective.
i bet your X54R or 303 Brit wouldn't say the same.
I've done the double size method plenty of times for certain cast... depending on the boolit, I'll even lube with molybee or 50/50 @.314 and seat a gas check, then go to .311, then to other sizes to preserve the lube grooves. 2 to 3 thou at a time.Buy a Lee .311 push through size die , spray bullets with Hornady case lube or something equivalent . Run them through it respray & run through your .309 ...
IME, it’s the hulls going into the press. New hulls look better than factory ammo.just me but i place them both in the same category.
mec's are the only reloaders i've ever seen that readjust themselves if you leave them alone for 10 minutes.