In the beginning, the H&G version of the "Keith S&W" was true to Elmer's design while the Ideal/Lyman 429421 was not and, therefore, the H&G was preferred. The reason was that the Ideal/Lyman version had a round grease groove while Keith specified a deep, square one which would carry a lot of lube down the bore. Lyman eventually changed this detail to match the H&G mold.
Bruce