Join Date: Jan 2007
These barrels have the same constriction of the bore well up from the breech. as far up as maybe 5-6"
How and what they loaded with I have no clue. When I checked mine, although small bore of .50 or less, they still wanted to hold a couple of hundred brains of powder to fill this chamber!
Try a long wire down the bore, as it may be just the constriction you are hitting.