I looked into bullet making really seriously.
Being in Mexico you'll have less hassel w/BATF and licensing.
It's expensive as heck and takes a bit of an ability.
The RBBT may mess with third decimal place in the BC and I don't see a great advantage to them in an extreme magnum, ven "if" they do something to reduce gas flow around them.
About 850 shots and I have about an inch and a half of "free bore". Maybe I'm a bit extreme with my extreme.
Get ahold of Dave Corbin's brother. He has a better deal money wise. At least did when I was looking.
There are several benchrest bullet makers who do great things with bullets but 338s are a bit tough in a standard reloading press.
$120.00 per box would be a good incentive though......