Not sure what you were doing, but for my inlines I just remove the breech plug and push everything through from the muzzle. Sometimes it takes a bit of force, or even a "bump" or two on the ramrod to get things moving.
Ditto for me. After removing the powder, by just pushing the bullet and sabot through from the muzzle, they are usually fine to use again. Or you might want to use a different sabot so you don't have one with grooves in it.