I would strongly suggest you stick with the manual recommendations.
A 200 grain bullet going 2500fps is plenty. I wouldn't get caught up on velocity as I would accuracy.
Make sure your shooting skills are up to par as well for a 650 yard shot?
A 180 grain bullet like the Hornady BTSP may be another option for you?
Read, read, and read some more on reloading! Ask plenty of questions. LEE ABC of Reloading is a good start.
Be safe.
