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well, you know your bullet travel's 2720 feets in one second. and it makes one turn every 9/12 of a foot.so 2720/(9/12)=3626,66667turn/second *60 to get in rpm. in physics, thermodynamics, etc. when you understand what is happening, formulas are useless stuff you don't need to remember cause you can figure them out and demonstrate how thy work. now, try to calculate the G- force of the acceleration inside the barrel ��
 
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