Congrats on the purchase! You'll love the Fireball. It's a sweet shooter, and cheap to reload.
The only loads I've ever made with 40 grain bullets are reduced loads with Unique to mimic 22 Magnum velocities. I normally run a 55 grain SP at 2,550 fps.
Formerly TN Lone Wolf
"We are only as strong as we are united, as weak as we are divided." - J.K. Rowling