The usable range of the Contraforte is from A0-C5. This is an improvement on the contrabassoon range by a few steps. Although I know some very talented contra players that can play almost as high as any contraforte. Im mostly posting this so that composers are able to hear the timbre change of the different registers.
The Contraforte does not have a dependable high D but it is possible. Here I play the opening bassoon solo from Stravinsky’s Rite of Spring, at actually pitch. I used an extremely thick reed with a lot of resistance.