Okay, today's update, short version: ram seems happy and still gradually improving. Took video of him on my phone, stopped in at vet to confer. Vet looked at video, listened to my description, said they could come see him and/or give me metacam for him if I wanted but as long as he was improving and seemed good in himself then me just continuing to monitor him seemed fine. She did suggest a follow up dose of Alamycin.
Long version, for those who find the details interesting or valuable: When I went over this morning he was lying down with the other rams in the sun at the top of the paddock. I walked over and stood about 2 metres from him and held out my hand. He got up, stretched, had a pee, and then came over to me for chin scratches, putting a little weight on his bad leg as he came. I used my phone to video him coming over and while he was standing for attention. Then I put the phone down and picked up his bad leg with my left hand while continuing to give chin scratches with my right. I moved his shoulder around and squeezed around it gently, he was completely relaxed, no reaction at all. Same with the knee and down the leg. At the front of his foot just above the hoof he reacted a little to pressure, just a bit of a twitch/flinch, but not pulling away. No heat that I could detect, maybe the slightest of swelling, hard to tell. No reaction to pressing the back of his foot.
So, from that I say: he's not in much pain, if he's comfortable enough to stretch and motivated to walk over just to get attention, and he doesn't react to me manipulating and squeezing his leg even though he's not restrained in any way. And it's probably not his shoulder or knee seeing as he seems completely comfortable with me moving those joints around. And he seems to be putting weight on it just another little bit more than he was yesterday, so I think he's improving but slowly and gradually.
I took the video and stopped in at my vet and asked if someone could chat with me about my lame ram to make sure I'm doing the right thing. Showed the vet the video and filled her in on the whole timeline and what I'd done each day. She said at the top of the hoof it could be a bit of infection or a hairline fracture, and they could come out and look at him if I wanted but if I was happy to keep monitoring him as long as he seemed to be improving, that should be fine too. She offered Metacam but agreed from the video and my description that it probably wasn't needed. She suggested a follow up dose of Alamycin at this stage might be sensible, so I bought a fresh bottle to be sure it was effective.
I have an additional suspicion, which I forgot to say to the vet, that it might be a bee sting. My neighbour keeps beehives next to that pasture and the pasture itself is tall grass and flowers (only grazing appropriate ones) so the bees are in there. That seems to me like it could be an explanation, although I would have thought it would have healed faster than this.
Video here
https://www.youtube.com/embed/F-8NWLhWx40