The throat/lead would probably be gone depending on depth of the cut. Pressures are probably really high.
Thanks, Dinny
my other post disappeared into the ether
when I've looked at all the specs on the Handi, and tried a Max brass in mine, I'd guess I could use a .380 reamer to do this very thing.
the long cone style leade tapers from 0.380 to 0.358 in, what over 0.400 inch?
according to my math (albeit a bit rusty) you would have to extend the chamber to 1.617 to get to a leade of 0.362" max diameter at the mouth.
with a maximum brass length of 1.605, you'd still have a leade of 0.3627 More than enough.
pressures would be unchanged
Why would this concern you?
this is no different than extending a neck of a bottle neck cartridge to deepen it a bit.
what am I missing?