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I was considering the following: 12 ga. "rim" diameter - 0.886" 45-120 rim diameter - 0.608 pressure of 12 ga. 3-1/2" - 14,000 psi 12 ga. rim surface area - 0.618 sq in. 45-120 rim surface area - 0.291 sq in. ratio of rim surface area = 2.124 12 ga pressure x surface area ratio 14,000 x 2.124 = 29763 psi Do you consider 30,000 psi a good number... to low...to high? |