Parker pattern tests as recorded in the stock book?

[Bindlestiff]

What do we know about how Parker Bros. pattern tested their barrels.

I have a letter on a 16ga gun that states they used #8 shot at a 30 inch circle at 40 yards (no mention of how many oz. of shot in shell). Another 16ga gun's letter states 7/8 oz of #8 shot at 30 yards (no mention of circle size, could this letter be wrong in that yards should be inches?).

A Parker hang tag has 30 inch circle at 40 yards printed as part of the tag with blank spaces to be filled in with the shot weight and size.



So, my questions:

1. What size shot did Parker Bros. use in their normal test process?
2. How many oz. of shot did they use in these tests, I assume the amount varied by gauge; probably more in an 8ga than in a 28ga?

If you have a hang tag, it would be interested in knowing what it says for oz. of shot and shot size used; it would be interesting to see that for several gauges.