Take much of Ackley's load data with a grain of salt. He developed almost none of it himself, instead relying on data "from various sources", including his customers(!). Modern pressure-tested data -with modern powders - does not support a 200-300 fps gain for most of his AI cartridges - the capacity increase is not large enough to allow this to occur at equal pressures. You can get almost as fast with the parent cases if you want to load to higher pressures....
The
old wives' tale about reducing case taper and reducing bolt thrust is just that, to a point. The thinking reloader knows this, but then how many
thinking reloaders are there?
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