[CosmicCoder]

FiveInADime posted previously:
I could try 75 gr. V-max or 70 gr. Nosler BTs. Might consider doing a 85gr. Sierra GK, BUT I WANTED TO TRY LIGHTER AND GET IN THE vicinity of 3500fps. I also want to try a new powder; thinking of H4350, Superformance, Win760, ect.

I suggest that you go ahead and give Superformance a try - it works great in the .243 Win case. I used to use 4064 for 75gr V-MAX and 4350 for 87gr V-MAX and 100gr InterLock bullets in my Weatherby Vanguard S2 but I have switched to Superformance and couldn't be happier. Here are my current Superformance loads and chronograph results:

    Bullet       Charge(gr)     MV(fps)
75gr V-MAX          49.0         3533
87gr V-MAX          47.0         3343
95gr SST            46.5         3258
100gr InterLock     46.0         3189