Hello, I also have a 240 Wby Mag in the ultra light weight, which I love! Such a light bullet, & it is moving! I do all my own reloading, and here's what I have found...

Using 100 gr Nosler Partition -
IMR 7828 - 53.5 gr, Fed215 Match Primer, loaded case length with be 3.294 & thats moving at 3260 fps

Using 95 gr Nosler Ballistic Tip -
you can use the same as above, with the same speed or
Reloader 22 - 53.0 gr, Fed215 Match Primer, same loaded case length, & moving at 3352 fps

I was also looking into using the scirroco's to see what results I can get from them. Hope this helps. GOOD LUCK