Blockage between cap nipple and bore.

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When one does clamp the barrel in a vise, be sure the jaws of the clamp are not compressing the barrel where there may be threads in the breech plug you are trying to remove.

Also be sure there is nothing that may impede the removal of the breech plug such as the drum in a CVA/Traditions breech or a touch hole liner that is threaded into the breech plug.
 
I would plug the nipple and then pour boiling water into the barrel, being careful not to burn yourself. It may take several attempts to loosen up the remaining grease. It looks like the grease is still holding some of the lead. The barrel will get very hot. during this procedure.
Remove the plug from the nipple, get some cleaning patches and a cleaning jag. You should hear and maybe see some moisture and air come out of the nipple.
CAUTION, dry patches will get stuck. Use two patches for drying the barrel. Then lubricate a patch with oil to avoid the possibility of getting the patch stuck. Last thing you need is having the cleaning rod stuck in the barrel.
I poured about 7 litres of boiling water down the barrel yesterday. Let it run out the nipple hole. Got some black stuff out. Blew air through nipple hole and shot another chunk of patch/wad out the barrel. Still no movement of the shot. I'm going to make a steel rod with chisel tip such as Grenadier1758 suggested and try to get the shot knocked loose. If that doesn't work...breech plug removal.
 
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I'm excited to claim victory! Grenadier1758 thank you and all of you others who offered suggestions. Grenadier1758, the chisel pointed rod did it. 5/16" steel rod ground evenly to have a centered chisel point worked great. I did the 1/4 turn and light smack with hammer all the way around a couple times. Then by hand several more rotations and poured a decent amount of shot out the barrell. Re-inserted the chisel rod and several more rotations got a bunch more out. (The first pour resulted in a bunch of shot rolling into the expansion joint in the driveway. The shot in the pic shows about 2/3 of what was in there.) Ran another 4 litres of boiling water and dish soap down the barrel. Rinsed, blew and dried. The result is in the pictures below. Any more advice before I start busting caps?
 

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Gee guys, I wish some of you would stop calling the smoothbore a RIFLE!
Well, @rhr1956 described the firearm as a rifle. It has rifle architecture with front and rear sights. The bore is smooth. You can see a picture of the complete firearm in his other thread asking for a suggested load for his "rifle". The proper terminology for this particular EIG 44 caliber smooth bored gun is a smooth rifle, which is what I have been calling it.

We are just waiting for the OP to get that block of oxidized shot out of the breech so he can go and shoot it.
 
Good grief. @rhr1956. You've already gotten 4 pages of advice on this thread and solved your problem long before we stretched this thread to 20 pages. We've kept the advice on this thread to most of it being pretty useful.

Run your borescope back down the barrel to make sure that you have all that shot out and your chambered breech is clean. Look for signs of pitting where that shot was lodged. Might be a little pitting. Finish your cleaning and dry the barrel. Use some rust inhibiting oil (Barricade) to protect it until you are ready to go to the range. Get the smooth rifle reassembled. Gather up the shooting components. Go ahead and get a new nipple. Are you going to try some shot? Get your #11 percussion caps.

Put a cap on your unloaded gun and fire at a blade of grass or something that will move to show that the flash channel is clear.

Set your adjustable measure for 50 grains of powder by volume. If there is pitting by the breech add a wad of you 50 grains volume of cornmeal to lift the ball above the potting.

Cap and fire.

Repeat.

Let us know what happens.
 
Well, @rhr1956 described the firearm as a rifle. It has rifle architecture with front and rear sights. The bore is smooth. You can see a picture of the complete firearm in his other thread asking for a suggested load for his "rifle". The proper terminology for this particular EIG 44 caliber smooth bored gun is a smooth rifle, which is what I have been calling it.

We are just waiting for the OP to get that block of oxidized shot out of the breech so he can go and shoot it.
Smooth rifle it is!
 
Good grief. @rhr1956. You've already gotten 4 pages of advice on this thread and solved your problem long before we stretched this thread to 20 pages. We've kept the advice on this thread to most of it being pretty useful.

Run your borescope back down the barrel to make sure that you have all that shot out and your chambered breech is clean. Look for signs of pitting where that shot was lodged. Might be a little pitting. Finish your cleaning and dry the barrel. Use some rust inhibiting oil (Barricade) to protect it until you are ready to go to the range. Get the smooth rifle reassembled. Gather up the shooting components. Go ahead and get a new nipple. Are you going to try some shot? Get your #11 percussion caps.

Put a cap on your unloaded gun and fire at a blade of grass or something that will move to show that the flash channel is clear.

Set your adjustable measure for 50 grains of powder by volume. If there is pitting by the breech add a wad of you 50 grains volume of cornmeal to lift the ball above the potting.

Cap and fire.

Repeat.

Let us know what happens.
Powder, cornmeal, ball, bang. Sounds delicious!
 
Smooth rifle it is!
From one of your last pics, it appears you have a patent breech. The pic shows a smaller powder chamber, the flash hole and the shoulder that joins the full diameter of the barrel. Get a 30 caliber Bore brush that fits your cleaning rod and run it down after cleaning the full bore. I put a cleaning patch on my brush. You have to keep that patent breech clean.
 
From one of your last pics, it appears you have a patent breech. The pic shows a smaller powder chamber, the flash hole and the shoulder that joins the full diameter of the barrel. Get a 30 caliber Bore brush that fits your cleaning rod and run it down after cleaning the full bore. I put a cleaning patch on my brush. You have to keep that patent breech clean.
Thanks!
 


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