Thread: Where to measure barrel length?

Originally Posted by 7mmsaum

Then subtract the length of the ammo measured with a comparator, this gives you the length of the rifling

Now you can see why the short mag (saum) looks so efficient in a short tube compared to long action cartridges, say 270 or rem mag

The inch shorter short mag ammo gives you an extra inch of rifling (more velocity)

A fact very often overlooked

The “efficiency” of a case really only exists on the internet, and has little practical application once you step outside.

Yep exactly.