The 3 groove Lilja barrels, at least the one I have on my 270 AM is holding up very well after 900 or more rounds.
With Lilja's tighter bores I'd say this/these barrels are a bit slower than others.
I'm interested in the throat "thing" also. Kirby had a modified design but it seemed to wear a bit faster than "normal" in the extreme magnums.
Shawn has something interesting going with a throat design. Gaining 150 fps or so over whatever is standard in the Edge.
From have only 4 shots down the tube of a 375 AM with 350s at I suppose 3200+ I see no reason to want more speed. Travel time for the 350 - 375 bullet is pretty much identical as the 195 - 270 bullet at the same speed.
Its pretty impressive.
I'm figuring that if some one removed some trees a shot from Butler County to Westmoreland County would be doable. That's clear across Allegheny county.