I agree with your thinking and thought process.... except, I would recommend you drop the sabot idea and simply use something like a Powerbelt bullet. I have found them to be accurate and very deadly. I know it's luck, but I believe I am something like 4 shots and 4 harvests of bucks with them in the last 5 years. All mature, 8 point bucks. There was also one doe killed, a 5th deer, that dressed at 148.
November 2010 here: