When reading about various cartridges I sometimes see comments like " With the lighter bullets in the XYZ you can get fantastic high velocity but barrel life plummets and throat erosion will show after a small number of rounds"

XYZ= fill in the blank, 220Swift,264Win,7mmSTW etc....

So the Question is, Is it "Velocity" that washes out the throat? or is it the "Heat" from all that powder going down a little bore that is to blame?

It's the New Year and I'm working on my Loonie Card Renewal.

"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen