All reamers are ground to SAAMI specifications unless you get custom
reamers made with less freebore.
A gunsmith will allways use SAAMI unless you ask for something special.
But remember if you shorten the freebore you will have to load down and
probably loose velocity(The reason for going to a Big cartrige in the first
Freebore does not prevent a cartrige from being accurate !!!!
J E CUSTOM