Re: 243 AI
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My suggestion would be to switch to a slower burning powder like H4831sc and work up to around 46 grains. You should see around 3200fps.
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I'd second that, not sure about the 3200 as I don't shoot the AI version, but I do better than 2900 with a 105 Amax in a standard 243 with a 26" tube.
Ignorance can be treated with education, sadly there is no cure for stupidity.