I have never hand loaded for the Manton - something I want to try. From memory, it shot well with factory ammo (about 17 years ago when it belonged to my brother).
It is not for sale. Seems as though there is quite a revival in interest in the .22HP doubles lately. Ever since Lewis Drake had a H&H on offer a couple years ago, they seem to be cropping up more regularly. I would like to see some in person to see if they are "scaled down" as the Manton is.
The Tolley I would sell though if there is any interest.