With the new powder, the 270 AI seems faster than a regular 270WSM and almost a Weatherby- It looks like with biger bullets that it might surpass the 280 and 280AI in capabilities too?
And if you load 17 into the WSM and WBY you will get higher speeds.
Pressure for pressure with the same barrel length, no Ackley
round is going to get within 200 fps of a magnum round.
Outside of saving yourself time trimming brass the Ackley is
most overrated. You can load it's unimproved daddy to within
50 to 75 fps of it.
