There is not much of a gain that I can see with the 243 WSSM. The 243 is already a short action. In some books the WSSM show 100-150 fps gain in velocity but thats hardly enough to make a real world difference. I picked one up as well but have not done anything with it yet. I would buy a good supply of casings and plan to reload it. The Lee loading kit is a good place to start. Buy a good reloading manual first and do some reading. Thats a good way to start learning. There are also some good vidios that I have seen that are probably well worth the money.