There are 2 ways that will "Tell the enquiring mind whatis the True,Length of Chamber, length of forcing cone,& angle of forcing cone, exact size of Bore at end of forcing cone,diam. of chamber at Rim,and the taper from rim to start of forcing cone,(Length of Chamber)....Tools needed for No 1.Vise with lead 'Jaws'(so as not to damage the Barrels),Hacksaw. Hold bbls. vertical in vise,(make sure the forend"Loop" is clear of the top of the lead jaw. Find center of chamber, use hack saw to saw straight down through the center of the barrel, aprox.3.1/2",remove bbls, then hold in horizontal position,put 2nd saw-cut across radius of bbl.to meet 1st saw-cut, piece should lift off, and you will see the most perfect Half of a Chamber, in full profile. You can then use your 6" steel rule for the needed measurements!!!This is, of course T/inCheek,Gunshop Humour, I have done this to several Barrels, for Research/Development. They make excellent conversation pieces!..The 2nd method for acurate measurement of Chamber for length, Diam. Forcing-Cone length & angle. Is"Cerrosafe"(Brownells Cat'lg.#55.P27. 1/2lb $10.84+Postage.)or
http://www.brownells.com)'Used the world over by Professionals & DIYs,100% accuracy)Please use care(& safety glasses) dont pour too quickly! Remember the Instuctions on the back of (If memory serves me)the Claymore Mine,"Not tobe taken Internally" !!!There is a photo of a breech-end of a pair of DBBLS.(Chapter 13 P76) S/Gun/Technicana,cutaway for the view of the inside of a chamber, with my brass 12b chamber gauge lying inside. Hope this answers 'a few questions'.Crossedchisles.
