Fiver, they are adjustable, but squeeze the neck inwards rather than roll it into a groove. The crimp area is about 1/16".
Now I feel silly. It took me a few minutes to realize that was a rhetorical question.
My pistol has a tighter neck and shorter throat than my 16" barrels, but the Lee 155 still chambers just fine if sized .311" and is crimped in the crimp groove. For the rifle barrels, I can seat the bullet out and crimp into the first driving band. The lyman 311672 is similar in weight, and its shape is such that I can seat it out and crimp into the first band for the pistol. My RCBS dies have the taper crimper and it works just fine.
I haven’t had good luck with the heavy NOE bullets in my Blackout, either the 230 or the 247. So far my best results have been with the Lee 230, the Lyman 195 grain MXL bullet (311679) or the RCBS 200 grain silhouette. I really wanted the 247 hollow point to work, but it seems to be just a bit too heavy for a 1:8 to stabilize at subsonic speeds.
I bought a 30 caliber throating reamer and am willing to sacrifice my cheap AR Stoner barrel if needed to get the overly fat NOE bullet to at least chamber reliably.
The Radical Blackout chambers and throats are a little on the generous side compared to most.[/QUOTE]
Generous is an understatement. I cast some of the 312 155s and made a dummy round. The neck measured .337 as opposed to a jacketed round measuring .332. It chambered and ejected fine.