Chasseur:
Sadly, we can't even get Brennekes anymore, so not much chance of specialty stuff like the Sauvestre Arrow catching the eye of our importers.

Perhaps some forum members have put them to the test stateside. They look like a fine idea, but they sacrifice the one thing that a big 12-bore slug will always have in its favour: wallop!

Hoppdoc:
There are few scientifically-conducted penetration tests available on the web. I have searched.....
Plenty of subjective comment, and certainly plenty of bulldust!
The number of punters who have tested penetration on water jugs, car bodies, old fridges, etc outweighs the number who have measured penetration on game by about a million to one!

Even Yogi has taken his banter over to Shotgun World to woo the masses, check this thread out if you have time, especially page 2:
Slug Gun Thread

That's the thanks you get for trying to help a guy out. Sheesh!
I re-read his last thread on NE.com and came to a slightly different conclusion from him and Karl.......

You just can't help some people!

Anyway, I guess we better organise a few penetration tests of our own, out among the paperbarks.....