What would it take to make 1.44 lbs-ft per cid ?

RAMM said

Im surprised I haven't seen the term "sonic choke" or MACH Index yet. If it has been brought up my apologies. J.Rob

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I was reading about it apparently anything above .3 MACH = 338 fps is where choke starts and since these fps are based off calculated fps you might actually be in it above 321 fps why calculated 321 fps is considered highest useable.