I guess the similarity of the low-recoil loads is that they all seem to use fast-burning powder, pistol or shotgun powder.
By only using a small amount, the pressure is kept within safe limits. And, it's completely combusted by the time the bullet is halfway through the bore, so there's no extra recoil from blast when it leaves the bore.
I use another even lower-recoil recipe when shooting lead (gas-checked) bullets in my swede mauser. 6.5x55. 130-gr bullet, 11 grains of Win231. Nice for 50 yards, loses a lot of elevation at 100.
With all these loads, most important is to pay attention when loading, because two or even three powder loads will fit into the brass. I put powder into a tray of cases, then peer carefully into each with a flashlight (and safety glasses) to see that they all look the same. With 11-grain loads, it's still easy to mess up. Once I think they have the right amount of powder, I seat the bullets.
An alternative to low-recoil rounds is a PAST shoulder pad, can be worn under a shirt. It's pretty good at absorbing recoil.
Regards.