On tough skin elk, I'd only recommend the 405 hollow point as "last resort using HPs".. with poly-tips being my first choice. If recoil's a problem & the 348 is the max grain you're comfortable with, then the 348 aero-tip has taken many elk on bigger game forum homes I've read. If shootin' sabot/bullets instead, I'd opt for any +325 grain poly-tip over a hollow point with elk. Also, powerful 777 powder would be my choice for better chance at an instant harvest.