c mac,
I'd save the 170's for javelina and varmints. For deer, go with a 210gr.JHP like the Hornady XTP, Nosler's bullet, Speer's semi-jacketed, or the Remington. Winchester hasn't come out with their platinum-tip ammo in .41Magnum yet, so no telling if or when the bullet will be sold as a component. If the deer are large in your area, you might try a heavy cast bullet with a large meplat for good tissue destruction. Good luck and tell me how the new 7.5" 657 does. I haven't added on to the collection yet as I've spent my mad money on a Ruger Blackhawk Hunter in .41Magnum. Must have more...more .41s... RKBA! :-D