As for a M1A in thirty-06, I don't Believe There was a person built ahead of. However, the M1 Garand went by way of some experimentation immediately after WWII (and I feel even a bit in the war) to add a detachable mag, which was the basis in the M14. https://danterfrbm.blogtov.com/18396461/a-review-of-federal-30-06-for-m1-garand-near-me