Re: .270 AI
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SpotcheckBilly</div><div class="ubbcode-body">Here's what ol' Ackley himself had to say about it on p.382 of his book "Handbook for Shooters & Reloaders Vol.1" -
.270 Winchester Improved (Ackley)
"This is a fire formed .270 made by firing factory cartridges in the improved chamber.Since the original .270 is over bore capacity, little improvement can be expected although some shooters say it is a fair cartridge for bullets heavier than 150 gr. Due to its relative inefficiency, it is not recommended. The standard .270 in unaltered form should be better, therefore no loading data is given."
To understand what Ackley was talking about when he mentioned "over bore capacity" you should read his chapter on the subject starting on p.165 of the same book that I already mentioned. It's too long for me to include in this post verbatim. </div></div>
Ackley had a great idea and this was a continuation of this. One of the problems is he created rounds that are actually much better suited with newer powders that take advantage of burn retardants and doublebased kernel type powders instead of ball. (Yes sir...he was ahead of his time) When he wrote that the only double based powder you could get was ball type. Which didn't fill the case near as much as kernel type. Thereby, at the time, proving what he wrote about not only the .270 (Win) AI, but the .280 (Rem) AI and the 30-06 AI. The last I don't understand because everybody and their brothers uncle was talking about how much an improvement the .300 Win mag was over the 30-06. Meaning the 30-06 was written off as overbore, but the .300 WM, .300 WBY, and the .300 H&H weren't?
Bottom line is: with newer powders, especially Re-17, it's a very viable round and will give about 100-150 FPS velocity advantage over the standard .270. It will come close to but not exceed the .270 WSM.