Thread: Video - 30/223 subsonic project

Originally Posted by ARdave

Wicked man, is that a .300 blackout/whisper calibre build or slightly different?

Similar, but without the added step of having to machine down the OAL of the parent .223 i.e. the 300whisper is usually made by shortening a standard .223 case, then necking it up to suit. The reason the Whisper is shortened is so that it can fit in an AR15 mag, whereas with my rifle (30/223) it doesn't matter about the OAL of the loaded round as I'm using it in a bolt action rifle.

This one (30/223) skips out the case shortening step and you just go ahead and size it in one go, just like you would with a normal Full length die.

kj