I am interested in using the WSM case for the short action and I heard that they were getting .257 weatherby velocities. I would never buy a .243 WSSM, I think it is stupid, it gets the same velocities as a .243, which is already a short action and has 10 times the factory loads and guns it is chambered in. I was leaning toward the 25 cal because I have a .223 and a 7x57 and the 25 is more in between than the 6.5.