You like your speed, so my answer is directed so you can get all that's possible.
Order the bullet weight you want from LBT, in .460 diameter on the body but ask to have the nose diameter cut to match your groove diameter.
Seat this bullet so the lube is covered, then throat out till it will chamber easily. If the bullet is a gas checked style and is wearing LBT lubricant, you can burn all the powder the case will hold and get delightful accuracy.