Ok,
As I understand it a typical die is threaded, bored and honed in one setup. It would be harder to MAKE one crookedy than to let it come out straight.
So then you might flip it over and bore a seat for a set of buttons (neck bushings) but other than that???
IMO this whole "the more you spend the better it gets" thing just doesn't hold water.
It's about fit, that's it.
"concentricity" and "linearity" are givens.
If you have fit, and the brainpower of a goat it's automatic.
I first found my faith shaken when I was 14yrs or so. My 'mentor,' the local reloading/shooting guru was totally jazzed, he'd just located a real gem..... a Hollywood reloading press!!!
DUDE!! he was EXCITED!! Fired right up...."he was gonna' load the straightest, the mostest concentricest the most ACCURATest ammo ever known to man!!!"
"THIS bad boy was so wicked straight and hellfer stout a monkey couldn't help but make the bestest ammo ever...."
"My guns are gonna' shoot like never before..."
etc
etc
So we LUGS this mostrosity down basement and BOLTS it to a customized bench made from a hunk of railroad trestle..... and WOW, I mean....
"so how do we use this thing?"
"Ohhh, it's easy. Screw a die in the top, stuff a shellholder in the bottom and HAVE AT IT!!!"
This thing's got a 3" diameter ram on it. It's so wicked straight it hurts to look at it, it warps spacetime just a little.
It can't HELP but make straight ammo right???
Soooooo, all you'se "real" machinists out there......We're gonna' use a similar setup to machine a simple series of parts. Maybe a run of 50 liddle hydraulic shafts...... We'll use this new quick-change system.
Works like this........ What you DO is, you SCREW a hunk of steel threaded 7/8X14 into a hole in the middle of the faceplate, bottom it out on a ring you've clamped around the threads . . . . . then (Here's the really good part!) SLIDE the other end into a horsehoe shaped "holder" and proceed. . . . .spin that sonafabuck right up there eh!
completely ludicrous.
Use the freakin' reloading press for what it's designed for. It's a simple leverage device, a RAM the stuffs the case up into the die and pulls it back out.
Job done.
Ain't NO PRESS nor reloading die ever "straightened NUTTIN'!!!
al