If you havent added the BB, try it, and maybe back off the load 'just a tad'?
Otherwise, get a small diameter piece of brass rod that just fits into your bore and will slide down, about 4-6" should be OK (a length that you can pocket easily and always have with you when out & about. Keep it in a baggy or a length of plastic tubing with caps to keep it clean. When you have a sticky case, keep the breech open and drop the rod down with you hand cupped behind the brass, it should pop out, if not, lower the muzzle, slide the rod back to top and try again. Beats trying to pry a case ot with a pocket knife.
For bigger bore rifles, carry a bullet the next caliber smaller and as heavy as you can get. This can be dropped in the same way and is, well, handi.