I'd work in .5 gr increments but you are doing fine.

If you need, I can give you links, Zak Smith/Demogod site has info on the Creed, and many guys on snipershide forum are using it as well.

You have a good powder, just take your time. I doubt you will need to add more than 1/2 to 1.5 gr to reach a top load.

Those speeds you have now are not bad though. Good luck and keep us posted.