12 pounder french long gun range

What would have been its firing range? I looked over and over in my books and on internet but it seems.... its a secret!View attachment 119998
I guess the information are given in this beautiful book:
 
Thank you Uwek... had looked at it, but no ranges for 12lb and 6lb guns of the 18th century.
 
I assume.... the effective range should have been 600 to 800m for the 12lb and 400 to 600m for the 6lb.

Appreciated any help.
 
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