Are you sure its a 300 H&H? I don't believe that was ever an advertized caliber. How about 300 Win. mag.? Can you send a pic of the gun and I'll look in my catalogs and see if looks factory. An original Colt 57 model was made in 57 and 58 with only 243 and 30-06 chamberings. The same gun was made after that but not marked "57" in added calibers such as 300 Win and 308.


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