This was my 4th season (2009) using the Buckhammer slugs. I've killed 4 deer with them and I would have to agree. I hit a buck this year just behind the near shoulder that immediately exited through the center of the far shoulder and rendered it completely inedible. Bittersweet, really.....

He ended up about 10 yards from where I hit him.

Last season, I killed two deer with the bow, but was not lucky enough to get one with the gun.
2007 - Killed a doe with a shot behind the shoulder. She went about 40 yards and piled up within sight.
2006 - I shot a doe walking downhill with the same type of shot (behind the near shoulder and through the far shoulder) and she tumbled to the ground on her next step. Later that same season, I hit a doe on a deer drive that was running straight away from me slightly downhill. The slug entered her spine about half way up her back even with the diaphragm and traveled into her ribcage. After I pulled the hide off that doe, it was easy to see where the slug had entered and broken her spine, bounced off the inside of her breastbone and punched another hole in the ribcage. The slug was lodged under the hide about 3 inches from the hole it had made in the ribcage. Pretty much tore up her boiler room. She tumbled to the ground when it hit her, zero tracking.
This is what the slug looked like after I pulled it out of her:
