I haven't "heard" that one...
Ackley "data" was filled with a lot of "I heard" and speculative, optimistic craziness.
In this case, having a lot of std. Roberts data and std. 25/06 data with H4350 and a chronograph is about ten thousand times more reputable, and repeatable, than anything original Ackley data could dream up.
I believe Ackley data had 3,450 with a 45 gr. bullet in the K-Hornet....just because it was "improved". Ouch!
Maybe it WAS chronographed somehow, but they used an old rimfire barrel?
