I play a hardtail stratocaster with the following set of strings: 13, 17, W26, W36, W44, W56 (W means wound) and tuned to C standard: C F Bb Eb G C.
Since all the time now I have intonation issues. All saddles are as far to the back as possible and the strings are all still a bit sharp. I measured the distance from nut to saddle and for example on the low C it is 652 mm (or 25.67 inches) which is longer than the usual 647 mm or 25.5 inches you would expect for a stratocaster. I was already thinking about putting the bridge even further to the back. Now the 12th fret is 2 cents off (I think, I use a Korg Pitchblack floor tuner and the C on the 12th fret is two lines away from the center). Is this because of the heavier strings or because of the low tuning? thank youuuuu : )