I use the swaged 148 gr HBWC from Hornady in my 4" model 10. I've fired them into water jugs and they blew through 15"s of jugs and bounced off a block of wood. I also fired them into a block of wood and they penetrated 4" and mushroomed to .60 as measured on my digital calipers. There was no tearing of the mushroomed collar. Just my experience with the HBWC, I'm not an expert, but I've been shooting since 1962. Hope this helps some.