Lee for mee
ArkansasFatboy--The Lee Collet neck-sizing dies have worked well for me, so when I bought a .300WSM, I wanted those dies for that cartridge. Lee was happy to make up a custom set for me--at extra cost, of course. They work fine.
Lee will make up any die you could name--Just send 'em a statement of your wants, a couple fired cartridges from the firearm for which you'll be loading, and a check.
I had 'em do the collet neck-size die, a FL sizing die, and a bullet seater.
Since my order, I believe that Lee has added the 300Whizzum to their standard catalogue of dies, so you could get the same dies for their standard price.
Check 'em out at
www.leeprecision.com Yep, they catalogue it. Betcha they used MY specs to build the die, I paid 'em to do it, then they made it a standard item. Sigh.