Sorry - your not getting 278 fps out of a true 27" draw 4-runner, with a 400grn arrow and stuff on the string.
Yea,
I am going to have to call bull sh*t on that one. I had one of the same year model and it didn't shoot that fast at 29.5 inches
The one I had was a monster 4 runner and I had it crancked up to 76 lbs and it would only shoot a 400 gr arrow in the mid 290's. I am think surely I should have gotten more the 15-18 fps out of and additional 6 lbs of draw weight and 2.5 inches more draw length.[>:]