Like you I have always been facinated by the French method of bias in experiments. The results are approximately half those given by De Scheel for Gribeauval Cannister. Alas there is no data upon the size of charge.
12-pdr Grapeshot [Graves (1984: p79 and 98)]
Target 18 feet long by 8 feet high
Heavy Cannister 41 1.5in shot
350 toise (700m) - 10-11/41
400 toise (800m) - 7-8/41
Light Cannister 112 1.1in shot
300 toise (600m) - 25/112
250 toise (500m) - 35/112
200 toise (400m)- 40/112
1 Toise = 1.947m so I have rounded up for ease.
The above results seem remarkable to me compared to the AnXI results that were in line with the British experiments that I posted earlier. I cannot find my copy of Piobert at present that has a list of other tests.