6mm Scorpion and 270 Helldriver

[MiG25]

I'm looking at a list of RCBS dies in Shooter's Bible #51 and it lists a 6mm Scorpion and 270 Helldriver, anybody know what these are?

 

[MiG25]

Somebody must know what these are?

 

[coyoteking]

From another forum;

“The .250 Helldiver was designed by champion bench rest shooter L. R. Wallack in the late 1940s and was a .30-40 Krag necked down to .25 caliber.
The .270 Helldiver was a .257 Roberts blown out and necked up to .277 caliber (but slightly different than Ackley's .270-257 Improved) and the .300 Helldiver was a .257 Roberts blown out and necked up to .308 caliber.”

 

[MiG25]

Thanks. I'll double check the list for the 250 and 300 and to confirm if it is Helldriver or Helldiver.

 

[MiG25]

The list has the 250 and 270 Helldiver, yes it is helldiver but not the 300.