At this point, get it into a press rather than hammering it. Hammering will leave marks....a press will move it. You can also make something with a bottle jack and some chain and wooden blocks, but I would recommend the press.
Place a block of hardwood onto the block so the press doesn't leave it's mark.
When I did my 25 pounder, I ended up using the 75 ton press at work, and while the pressure gauge doesn't work on our press, I was up in the higher end of force. Once the rust "cracked", it was smooth sailing after that. Make sure you have a hunk of plywood on the floor for when the breech block finally falls out.
If you can get it in to your maintenance shop, they will have the right press for the job.
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