Cayugad,
You are absolutelycorrect that shooting the ramrod out could be dangerous even with a small amount of powder. My gun dealer did this once with a trickle of powder behind the nipple and it shot the stuck ballout and through his barn and into his outboard motor cover. He'll never do that again or at theleast he'llpoint it in a safer direction the next time.
He may not get a good enough seal to blow it out with an air compressor like you said, but I'd sure give it a try. And again point the muzzle in a safe direction.
I've always wanted an excuse to pull a breech, but glad that I haven't had too at least on my rifles.
We use Kroil Oil at work and it's the best as far as I'm concerned. A little heat maybe neede too.