silhouette cartridges

[Don McDowell]

I haven't been able to get my 405 to shoot black worth a poop yet, and I know some of the guys that had 40-xx'sl built on the 14 twist aren't finding the nirvana they thought they were in for.
If that barrel is a true .405 barrel, you'll need a .400 diameter slick.
Quite a few years back they were basically renaming the 405 to something else and running with it, but that didn't last long.
16 twist is already quite a bit faster than the normal 40 cal twist which was mostly 18 and 20 back in the day.