You could try shooting it out but being a brush and not being solid or near air tight, probably wouldn't work, but hay, what have you got to loose trying. Another option probably wouldn't work either but does work on really stuck RBs or jags, put a grease zert in the place of the nipple and use a grease gun to pump it out. You shouldn't need to fill your bore with grease, just enough to get it started moving.