Geno:
Do you have addition "small bore" listings for gauges smaller than 172,28?
It's close and probably just semantics but I think it was for 6,75mm and 2-piper may have run upon something in that they were using 0,05 mm increments on the subgauge around the chambering, but this is just pure conjecture on my part. Also, I think PI to have been considered 3.14 and the mass of lead was some integer or 1/2 integer value like 708.5, 709, 709.5(lb/ft^3), that is if they used English units. I'm beginning to think the calculations were all in metric and they performed some type of mm to inch conversion. Really without a chart, or a lot of examples, all we can do is perform calculations using diameters that approach the prescriptive plug gauge value.
Kind Regards,
Raimey
rse
