I'm getting confused here...is Canyon Cruiser running an UltraMag,or a 375 Ruger case necked to 7mm?

What barrel length?

If it's the 375Ruger necked down to 7mm, it's about identical to a 7mmDakota,and I am having a hard time getting my head around 3700 fps with a 140......just curious.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.