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Old February 4, 2020, 01:57 PM   #7
Head Tomcat
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Join Date: December 16, 2019
Location: Northern Virginia
Posts: 31
Rod,

The original conversions from Colt of their C&B pistols to metallic cartridge were designed to be convenient "drop in" for their customers who already had .375 diameter barrels.

So, the factory chose to go with heeled bullets and outside lubrication in their metallic cartridge to account for this larger bore and black powder. This was called the ".38 Long Colt" cartridge as there was also a .38 Short Colt, too.

I believe that later Colt went to lubed bullets where the groove was inside the case as the external lube tended to pick up debris, abrade away, etc. during use.

Head Tomcat
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