What's the thumbrules or guidance on bullet seating depth when you can't get close to the lands? Seems like I recall a guide line of 1/10th of the diameter or bullet length? I can't remember clearly. I have some Nosler 55 and 70 gr BT's, for the .243. They don't publish a recommended COAL for these. I doubt I'll be able to get close to the lands. Same thing happened with the Sierra 70 MK's. I seated to their recommended COAL.