Quote:
Originally Posted by Sim123456
But maybe the thickness is never even from a can batch to an other another anyway 
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That's what I concluded from my minimal testing some months back. I really wanted to give a reliable "poor man's chrony" based on cans we have here in Canada, rather than cans used in Asia, but couldn't get any consistent results. I'm chalking it up to inconsistency in thickness / strength of our cans, as I can confirm that the muzzle velocity of my guns are fairly consistent within 10-15 fps...