Check out Nosler's reloading data. That's what I used for my 270wsm. The load I'm using now is 63 gr of IMR 4350 with 130 gr Nosler BT @ 2.85 OAL. Gets me right under 1 inch groups. Its not nearly as accurate as the first batch of "underloads" I made but I wanted something to hit hard since I only use the rifle for hunting out to 500 yards. With the underloads I went with 57 gr of 4350 which got me down to the velocity of a standard 270 win. but I could make under half inch groups all day and still had plenty of killing power. I used CCI 250s with the underloads and CCI Benchrest with the max load (maybe that's the difference in accuracy?). I'm assuming yours is a hunting rifle since you have a standard barrel.
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