Vol423,
It was I believe standard practice in the British gun trade to set the convergence of 12G barrels at 40 yards. Packing blocks are made to space the barrels during the manufacturing process so as to guarantee the point of impact.
In the case of the double rifle, in particular large calibre ,the point of impact was set at 100 yards. Once again guaranteed by the use of packing blocks during manufacture.
[IE: I recognise that in the case of the double rifle regulation may be required despite the use of packing blocks]
I recall that years ago when visiting H&H they had on display a very large block of teak sectioned to show two bullets entering the block and impacting on one another.The bullets were said to be fired from a fixed bench rest at 100 yards.
Last edited by Roy Hebbes; 05/08/13 12:39 PM.
