If it's properly working , after firing look at the muzzle and you should see a lube "star" , a light deposit that resembles a star. If no lube star is present , then the lube is staying in the lube groove ( I've picked up plenty of bullets with hard lube still in the groove) or the lube has run out before exiting the barrel...not enough for the job at hand.
And of course some vaporizes into, my favorite TV show..." GUNSMOKE".
Gary
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