What was it? (fully rifled guns) any ideas? My book is still in the post from the US(sheesh) the gun rifle and hound in East and West by 'Snaffle'

Any of you know what 12-bore it was he used? Mentions it a lot.......from the online version, however I wish to read the real thing when it arrives.......but for those of you who have had the pleasure, what chamber length/load/bullet was he using?

Many thanks!

Ben