Full power loading a 44 Magnum is so simple. Either 24-25 grains of H110/W296, or 22 grains of 2400, with a 250 grain bullet. Really not much need for a reloading book.
26.5 grains of 2400 would be a fantastic over load! I can't imagine any revolver standing it.
Listen to this man, he's been shooting these loadings longer than I've been breathing. If there were something better, he'd have found it by now.