I don't necessarily agree that hammering a bulged barrel back to shape is a great idea, but it's done anyway.
From what I've heard that happens to guns and rifles that have then gone on to pass proof.

I prefer to take a more prophylactic approach - by way of careful diet and care of what I have!

Cheers
Tinker

Of course, a barrel bulged in proofing, is hammered down, then re-proofed, hammered, etc, until it passes - if it doesnt blow, of course.

"Struck or Striking" - refers to filing, not hammering - if WW Greener can be believed. I cannot see fling away evidence of trouble or hammering a problem as being a solution, either. Hammering down a bulge us different I suppose, as the hammering work-hardens - whether this relates to Damascus barrels only, or only when BP is used for proofing, I don't know.