Just finished up!
I ran a brass chamber brush around in the Break-free (2 days soaking) chambwes and then wiped the Krud out. I re aoolied Break-free to 0000 ateel Wool and ran the chambers through with a tight fitting wad of wool and a drill motor. Not stopping, constantlly moving, the 0000 wool.
I then wiped the whole mess dry and cleaned the barrels.
Now putting a 29ga 7/12/ 3/4 oz shell in, it just drops in.
Thw 2 3/4" #4 Phesant Load by Remington, now easilly enters till the brass contacts the mouth and then you need a slight finger pressure to botton=m it!
Thanks for the tips guys, they really worked!