I also would like to know!

Since they were originally done as a private commission, Redoubt musketeers figures are 32-35mm, but if you assume that in this picture the round bases are 25mm in diameter, the Warbases minis looks bigger than "true" 28mm!

The sculpts look very "big headed" to me... This picture is from Warbase's Facebook...

And I've just found this:

Hope that helps!