SAAMI COL is the same for all 30-06 bullet weights. To find out what you guns COL is resize a case, seat a bullet until it is just barely being held in the neck and chamber the round. The bullet should contact the rifling and push further into the neck, remove and measure the COL then reduce by about twenty thousandths. You will also want to pay attention to the max length the magazine will allow you to seat the bullets out to. That's one way to do it, the other is to buy a comparator.