You will never know the velocity without a chronograph only guess work. The powders you have will work fine in the 7mm with H-414 probably giving you the highest velocity. Begin with starting loads and work up looking for the best accuracy or until you reach maximum loads listed.

Shew me thy ways, O LORD: teach me thy paths.
"there are few better cartridges on Earth than the 7 x 57mm Mauser"
"the .30 Springfield is light, accurate, penetrating, and has surprising stopping power"