Yep, I would not change a thing for this hunt, you are good to go!
Just for reference, I shoot 460 gr bullshops (no excuses would be very similar and easier to get) with 90 gr of fffg 777. That is to say that you don't want to go with more powder unless you get a stouter bullet. If you are using factory maxiballs they are a lead alloy so they are tougher than pure lead, but even with them, you can push too hard and get too much fragmentation of the bullet.
