I would check for the dreaded doughnut before torching off a hot load. The longer neck of the 257 puts some of the shoulder into the neck and the brass can be thicker in the shoulder area. May not be a problem but worth checking.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli