Looking at doing a 243 to 300WSM conversion. I realize I'll probably have to special order a bolt head as it will need to be push feed instead of controlled feed like the production 300WSM's. Where I'm a little foggy here is the front baffle and firing pin. I keep seeing differing info on pin size. Many say all calibers use the same diameter post 2001. Others say there is a different size for magnum heads. I've also seen that there is apparently a short action magnum front baffle. Any body have a clear idea of what is actually needed?