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About LinkBacks12g case head roughly 1.9cm diameter.
1 inch = 2.54cm
1.9/2.54=0.748 inches
Area of a circle
A=pi x r^2
pi x (0.748/2)^2 = 0.439 in^2
12g case head about 0.439 in^2
0.439 in x 11300 psi = 4966 pounds bolt thrust
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Thread: Shotgun-9mm thing
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20-04-2014, 10:22 AM #1Member
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