My favorite load is a 300 gr Hornady XTP mag ahead of 100 grains of Triple Seven. Anything in the way had better duck! I have only used on deer and black bear (and never had a tracking job) but would not hesitate to also use on elk inside 125 yards.
The 240 XTPs give a little extra range, maybe 150, and are probably great for pronghorn but I feel would be on the light side for elk, given the better 300 grain option.
The non-mag versions of the XTP are also fine for deer sized game but are IMO too lightly constructed for elk, you will have jacket separation and over-expansion on close shots at bigger game.
As stated above, regs vary and scope and sabots may not be legal everywhere, such as CO. For those situations, No Excuses has some great options for conicals, just match them up properly to your rate of twist so you stabilize properly.