La Belle, cannons drawn in plan 49 mm (scale 1:36) = 1,76 meters.
La Volage, cannons drawn in plan 57,5 mm (scale 1:36) = 1,92 m meters.
La Belle, found 4 guns of the "Faucon" as cargo, length 5 pieds (1 pied 32,5 cm) = 1,625 meters, recorded in the archiv in Rochefort, France.
And 3 cannons with a length of 5 feet (152,40 cm) 7 Inches (17,78 cm) = 1,70 meters. Data from the book: From a Watery Grave, James Bruseth, 2005, page 93.
In the book "Artillerie de mer", Ancre Publishing, page 29, 4-pounders of 1674 are given with a tube length of 1,76 meters. This corresponds to the construction plan of the "La Belle" according to Boudriot.
La Volage. Lemineur gives the length of his gun barrels on page 79 as 6 pieds.
In the book "Artillerie de mer" plan 1, page 202, year 1700, the tube length of a 4-pounder is given as 6 pieds = 1,95 meters. This corresponds to the construction plan of the "La Volage" according to Lemineur.
Finally, there are differences according to the foundries an conversion errors.
With 4-poundings greetings
Thomas