If you do that with a cartridge like the 6.5 creedmoor, you still couldn’t fit it in most magazines and would have to chamber the action with a longer throat than saami to begin with or the bolt wouldn’t close.I disagree, unless you start reaming them. The whole point is to be able to seat the entire bullet in the neck above the neck-shoulder junction where the donut forms. If your brass is like 243 with long sloping shoulders, that junction is further from the case head. Seat the bullet above that point, and you have an OAL that exceeds what a standard AI mag can handle, right?