I hear ya, the hornady book as what i have cross referenced seems way low on everything compared to seirra,speer,nosler, etc.
On the montana gold stuff, i have found no load data specifically for that type of bullet, maybe i dont have the right book, i just took what i have been searching/reading plus what it says for the other bullet manufactures in the same bullet, which seemed to be 24-26grs of h335 at 2.250-2.260