Spray the barrel with Kroil or similar penetrant. Go to home depot and get some wooden dowels for beating on the thing, they can't scratch the bore. A metal rod will trash the bore.I have a late 80's .44 Magnum [3 inch barrel] with a plated squib bullett stuck in the barrel.
A "range rod" and a 16 ounce hammer will not move it more than 1/2 way. This is rediculas...![]()
I'm from Germany and don't know what a squib bullet is, but I had the almost same problem about 15 years ago when I had the opinion to save money and recoil by using not to much powder when firing my jacketed bullets in my M 14 38 special.
A friend of mine drilled a hole into the bullet to remove lead and copper material to make it more easy to push those two (!) bullets out of the barrel with a wooden rod.
The M 14 thereafter was the same tackdriver as he was before.
What about shooting a blank to blow the sucker out?
I would go with a smal hole drilled down center of bullet as well. This will give a contraction cavity while you are forcing the bullet down the barrell with a wooden rod.
Military experience:
Ive had 2 squib rounds in my career. M240 and an M4. The 240 was removed by utilizing the Boat Shop's 6 foots press. The M4 was corrected by replacing the barrel.
Let us know what works best.
Be careful with anything steel used to pound on it inside the barrel. A hardwood dowel is less likely to do any damage. Use the largest diameter that will fit in the bore.
Use a lubricant. Break-Free or similar from both ends of the barrel.