My .357 die gives me .3565 measured on a micrometer. Works well on all of my 9mm's. Maybe try loading and shooting 50 or so and see how they perform before going through the trouble of opening it up. You can always open it up later, but you can't put it back after.
Auggie D.
They won’t pay for the shipping to them but they’ll fix and return for free. But the shipping there is $20 while a new dies is $32. Soooo lapping it is.