Hornady does load the 100 gr. Interlock bullets in the Custom line 250-3000 ammo. At least they say they do, though I have yet to find any available to buy. I wonder if they will load the new 90 gr. CX bullet in a Superformance for 250-3000. None of these are available now, so I look at every gun show for 100 gr. .257 bullets.
