Rules of thumb engaged; Subtract 35 fps and you're in the low to mid 280 fps range.
I ain't sayin' it's not possible, just questionable. My fastest UltraTec, a 2000 listed at 314 fps, nails 295 fps. set to 62 pounds and 29" of draw with a 314 gr arrow. I use one brass nock and a cushion button and a just short of 4" center serving.