Good on you for noting an apparent discrepancy in the Ramshot load data re the load data for 55 gr. vs. 62 gr.
Western Powders (owners of Ramshot) employs an excellent/knowledgable ballistics engineer who can answer your question on these powders - use their "Contact Us" option on the Western Powders website.
I have emailed this fellow in the past; he will get back to you.