I only know about that from a bloke I used to know back in Darwin, he wanted me to make a new hammer for his grandfathers old 25/20.
I went around to check it out and while having a beer I asked his grandfather why he had a 25/20 in the territory?
That's when he told me it was his old buff culling gun from when he used to hunt them for money as a young man.
Apparently he and most of the other Skinners used to use them as it was so easy to handle one handed on horse back.
I asked him why not a pistol and he said that they liked to stick the muzzle right up against their head and could not do that with a, pistol.

I wish I had more information then that but that's what I was told.

He did say it was his father's gun and he used to hunt them like that too so there must be some historical information about it. I've no doubt the 303 became the gun of choice after the 1st world war.