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warbirdlover · October 12, 2012, 07:05 PM

You're probably going to have to handload for that and that's going to add to the problem. If you only neck size you can fire form new brass from the regular .257 Roberts cartridge and just leave the chamber alone.

October 12, 2012, 07:05 PM	#6
warbirdlover Senior Member Join Date: December 13, 2009 Location: central Wisconsin Posts: 2,322	You're probably going to have to handload for that and that's going to add to the problem. If you only neck size you can fire form new brass from the regular .257 Roberts cartridge and just leave the chamber alone.