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the barrel isnt damages with blanks as much as it is with live rounds.
" Trainer B felt that extended cyclic fire of blanks will NOT damage a barrel because 1) the lack of bullets causing friction within the bore means drastically less heat will be produced and 2) blank ammo uses slow buring black powder that burns at a much lower temperature, thus again less heat will be created." I doubt they use black powder is blanks. It is very corrosive and it doesnt burn slow it actualy explodes. Its deemed an explosive, that is why you cant go to bass pro and pick up a pound or two.
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