Source 1
Article in the (UK) The Journal of The Forensic Science Soc.
Auth. Victor Drake
Units Brit Long Ton (2240#/T) Radial Lead Crusher Method
Max 2.8T @1"
2.5T @6"
0.5T @14" Linear decline hereafter
0.25T@20"
0.1T @30"
Source2 Burrard The Modern Shotgun , Ch. Pressure
2.8T@1"
0.36T@20"
0.2 T@30"
Both typical Brit Flake Powder 2&12",12b., 1&1/16oz loads vis Eley Grand Prix etc.
Range 220-450 psi.
N.B. Progressive or slower burning powders would increase this e.g. Goose Loads with Blue Dot etc.
Hope this helps
Hugh Lomas
