Would 90 grains of T7 2F be to light of a load for a 250 grain shockwave?

Not at all. 90 grains of 777 is a powerful load.

Not at all. As long as that combination shoots good in your gun that should be plenty of power to kill what ever you're hunting. What gun are you shooting this load in?

T/C Triumph

How does this load shoot in your gun? Are you using the sabot that comes with the Shockwave? If it shoots well, you will be fine. Accuracy is the key, you'll have plenty of power as long as you do your job.

Start at 90 and work up until you find the most accurate load for your rifle. My Omega likes 110 gr.

Charlie