[alt-photo] Dmax for silver paper

[Globe Trotteur]

Does any body knows which silver paper gives the highest dmax? (fibre or RC)The latest ilford multigrade art 300 paper gives me a 1.5 Dmax (measure by my X-rite 810).From what i understand, the higher the dmax, the more shades of gray you get.I read that the highest Dmax a silver paper can give is 2.2. Is that true?Thanks.Pierre