Since I've never shot the WSSM, I can't give any advice on how it performs. Judging by the "paper" comparison, I totally agree with the others! At half the price for the same ballistics the .243 is the way to go! Plus the fact that finding the double priced ammo may be the biggest downfall! The .243 has been a top seller foralmost 50 years! Some of the newbies will be dead in less than ten years!