.257 Roberts which case?

[cgturner7]

I know I've heard this here before but what case is the .257 Roberts based on?

Also, what are the rounds that are based on the .308?

[ktscontender]

I believe the roberts was based on the 7x57 Mauser

308 I think is just a cut down '06

[frizzellr]

Yes, the 257 Roberts is based on the 7mm Mauser. The cartridges based on the 308 that are in commercial production are the 243 Win, 260 Rem, 7mm-08 Rem, and 358 Win. If you get into wildcats there are a few more.