ihuntbuck
OK, you asked but you need to know that i am
totally biased....
The best bullet out to 175 yards is the Nolser Partition HP.451 -260 grain, powered by 100 to 110 grains of T7-2f loose powder in an MMP HPH-24 sabot. (1850/1900 ft./sec 2000 ft. lbs. of energy @ the muzzle)
My second choice is a Spreer Gold Dot Bonded Bullet .452 - 250 grain Colt, with the same powder load and same sabot....
The real up and comer for me, is the Hornady 10mm (40 cal) 200 grain XTP, pushed by 110 grains T7-2f in an MMP HPH-40/50 Blue sabot.
All of these shoot excellently from my Omega.
And the two bullets you have mentioned are also good. The 240 xtp has probablaly killed more deer from an ML than any other bullet. And of corse the 250 grain SM is areodynamically superior to all the mentioned bullets, but IMO it does not perform at close ranges as well as any of the afore mentioned bullets....
I have always used Nosler they are just climbing out of my price range...
Good luck....