My Mod. 70 in .243 Win. is a long action. Anyone know why it wouldn't be a short action. It was Mfg. in 1979. I ordered an aftermarket stock and they sent me a short action, but it didn't fit of course. I called Winchester and the guy on the other end of the line couldn't give me a reason and told me it should have been a short action. Can anyone add any logic to this?