I'm doing a long chamber in the NEF. Just lengthening
the present 3 inch chamber .The base size of
the regular chamber in NEF is max dimensions,
and in my Savage I have a smaller minimum size.
It wworks grear with long case. So for brass
use in the NEF I honed out a base die bigger to
match NEF size, then it won't over work brass
and it maybe only will need sizing once in every 20 shots, and with the proper fit resizing will be easier.And
my other base die does Savage.Same
top die will do both top halves. Ed