I believe the 24 grains of H110/296 is supposed to be a factory equivalent load for the 240 XTP. I use the 250 XTP in a 45 Colt SBH Hunter going around 1200 FPS (20.3 grains of 2400). I never got a shot at a deer this year, so I have no first hand experience with the XTP's performance on deer.
However, I must say that my experience shooting 4 deer with a 45/70 using a hard cast WLN cast bullet with a .360 meplat have been disappointing. I know this is a handgun discussion, but a wound channel produced by a .360 meplat cast bullet going 1500 FPS should be at least as large as that of a 250 - 300 grain WFN with a identical meplat out of a 44/45 caliber handgun going 1200 - 1300 FPS. My field results are as follows:
Deer # 1 was facing me at 50 yards. I hit her high on the shoulder and she ran ~ 25 yards into heavy cover and laid down. There was no blood trail and I almost lost the deer.
Deer # 2 was a neck shot and hit the ground instantly and bled pretty well. I was actually aiming into the shoulder, but the deer moved just as I pulled the trigger.
Deer # 3 was a shoulder shot at about 20 yards. She ran like hell for at least 100 yards into heavy cover and I was not able to find the deer. There was also no blood trail.
Deer # 4 was similar results to # 3, about a 50 yard shot into the shoulder. I followed a very light blood trail for almost half a mile and never found the deer.
After this experience, I quit using cast on deer and switched to the Hornday 300 grain HP on 45/70.