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Rifling depth of a Lyman .50 GPR left handed percussion gun

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user 57295

32 Cal
Feb 22, 2023
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Just wondering if anyone out there would know the rifling depth. I have no way of measuring it, but I do know it's a 1:66 as I have done some research on it and it seems that Lyman only made the .50 L/H GPR in a slow twist.
I have also read that a few people shoot conical bullets out of a shallow rifling one. To the naked eye it looks shallow, but I'm no gunsmith so any info would be great.

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