Inre SW 500 mag.
I have the SW 500 8 3/4" and the snubby 2" so I chew up ammo pretty quickly as all my friends just have to try them out. Go figure
Check out the Double tap. It looks like a better round than the magtech. I Have done some research on Doubletap and have found nothing bad about them. I have also used hornady and magtech without problems.
They have two rounds: both are $39.95 /20rnds
1.) 350gr JHP 1975 fps/ 3032 ft/lbs
2.)500gr JSP 15 fps/ 2500 ft/lbs