Those 12 shots averages by the Trackman report 262 yds. But, as I said, there is no use for 300 yard shots if they don´t land anywhere near the centre of the fairway.
In case Trackman is anyhow reliable, I consider proven that 16 handicapper can hit 300+ yards since 27,9 handicapper can also.
Edit: You mentioned PW/Driver carry ratio. That is correct, it´s quite close of it.
Was this thread about carry or total?