How fast will someone neck it up to .30 caliber and say it's an improvement on the .300 AAC Blackout?
That's been around for at least 10 years now, just without the rebated rim. There are a number of wildcats using the 6.8 SPC case necked to 30 cal, using 30 Herrett dies. (30 Herrett was formed from 30/30; 6.8 came from the old 30 Remington, which was a rimless 30/30.)
These are definitely more powerful than a 300 Blackout, obviously, with much larger case capacity. I made my own version that is in between the 30/30 and 308 in power, somewhat similar to 300 Savage but in an AR15. I'll post pics sometime if anyone is interested.
