Many times I have heard of the smith cutting the chamber would also take a scrap barrels and make you a sizing die out of it.
Here is an RCBS set for the 257 ACKLY
https://shop.rcbs.com/WebConnect/Mai...te=C09J045N142
Here is hte FL sizer die set.
https://shop.rcbs.com/WebConnect/Mai...te=C09J045N142
Redding offers a set as well.
http://www.redding-reloading.com/onl...-sets-series-c
Getting popcorn and fanboy flame war chair. Cause here we go again.