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The Hornady book says coal for that bullet is 2.200, I tried that and the accuracy dropped way off, why ?
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Cuz Hornady didn't develop their data with your gun.
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If I loaded a coal of 2.200 would I be able to match the accuracy by using less powder ?
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Maybe. Or possibly with more powder.... only one way to know.
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By seating the bullet deeper in the case to get the coal of 2.200 that would leave less space inside the case so would less powder give me the same pressure and velocity and accuracy ?
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Actually, until you REALLY start to intrude on powder space, making a rifle round shorter tends to DECREASE pressure, because the "running start" into the rifling more than compensates for the decreased space. Longer rounds give less running start and require more pressure to engrave the bullet.
UncleNick has a chart he posts from time to time which shows the affect of OAL changes in .308 (I think it's .308). I don't have a link to it but maybe he'll be around to show it and expound on it...