Hope you have better luck getting your American to shoot than I did...after a $200 Boyds glass bedded stock, a $120 Timney trigger and a $250 X-Caliber 1 in 9 twist 26" barrel {would have cost more, but I did all the work myself} mine is acceptable.
When it was stock, it liked 52 grain A-Max with 24.0 grains of H322. Now it is liking 26.0 grains of W748 behind a 69 grain BTHPM Sierra.