HDD=Hard Disk Drive. I didn't pop for the HD version.
http://www.sonystyle.com/webapp/wcs/...52921665738346
I'm using 225 Out Law bullets and a little Trail boss. I hunt with a mag full of supersonic and a sub in the pipe. Savage center feed mags are not user friendly when it comes to dropping a single round on top of the mag. That's why there is a lot of noise between shots.