I've seen JB's load of 60gr of Superformance with 120gr TTSX's for .280 Rem., but I'm wanting to load up some 154 Hornady Interbonds and have been looking for some load data for Superformance for that bullet. Anybody got any Superformance data for this bullet in a .280 Rem., or can suggest a starting load?

My favorite bullet for my 280 is 154 grain Hornady, but I use the Interlock SP's. It shoots quite well with 54 grains of H4831SC. I'd also consider Aliant Reloader 22 in 58 to 59 grains.
These are not too hot loads in my 280, but they are towards the top. That Interbond looks interesting... Also considering SST's, though no experience with them.

I think they only supplied load data for that powder for a very small number of cartridges/bullet combos. I think when it came out they cautioned not to use different bullets/primers/brass than was listed. All of my stuff is miles away, but that seems to be what I remember about that powder.