I load for the 257 and other Weatherbies. They do not headspace on the shoulder so this should not be a critical area in terms of fine adjusting the dies. If you are using RCBS dies and Shell Holders on an RCBS press, this should not be happening with the die screwed down as far as you have it. Has nothing to do with your gun having a tight chamber, it is far more likely that your die is out of spec. Call RCBS and get them to replace the FL sizing die.
The other thing that will help a lot is to get a neck sizing die, that way once your cases are fire formed you aren't overworking the brass. Your groups will likely improve and your brass will definitely last a lot longer.
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