I am having a custom gun built and want to go with a 2 piece Nightforec Steel base and rings to make loading the gun easier. Nightforce is saying not to lapp the rings. What if the base mounts are not square? Not really sure who or what to believe anymore. This will be on a 300 win mag and want to be able to shoot to 800 yards. Someone with more knowledge then me want to pipe in. What should I do? I have heard problems with lapping.