I have an old 20ga. with a fixed full choke that patterns them very well for head/neck shots at 40 plus yds, they hit a turkey like a hammer.
most ballistic gel tests have them performing/penetrating like lead #2 shot, with of course the benefit of increased pellet count.
if a follow up shot is needed the extra penetration over the HVWT 7's is a plus
The 6's patterned better with a little more open choke than the HVWT 7's did in the guns I shot them in