Hi all! Just received Tim Mullin's book on the Registered Magums last week and in reading thru it I've decided that I need to acquire a box of early 357 Magnum ammo (like yellow and blue box Winchester) from the 1930s or 40s. While I don't own a Registered Mag I'd like a box to go with my 27-2. Can anyone give me a ballpark price on a box of this? I realize that condition is everything but would $200-300 get me into a decent box of it, or am I looking more at $400 or more? Thanks in advance