I am unaware of any black powder cartridge called the .32 H&R Long. There is no such cartridge listed in any of the references books I have, nor in the records of the US Patent Office. ( I am aware of the modern .32 H&R Magnum ). H&R catalog describes their first top break revolver as a "Self Extracting Hand Ejector" chambered in .32 Centerfire and .32 H&R Long Centerfire, and a follow up model "The Automatic Ejector" revolver, as being available in the same calibers. My guess is that H&R use their imagination and poetic license in calling the chambering " .32 H&R Long" when it was really a cylinder that chambered the .32 S&W Long. The .32 Long Merwin & Hulbert is slightly shorter than the .32 S&W Long, but would chamber in a gun made to shoot .32 S&W Long rounds. There are many models of H&R revolvers in .32 caliber that will shoot the S&W .32 ( Short ) round, but they are not top breaks. Ed.