the short awnser is likely not as much as you think - very wind dependant and distance - deer hear loud noises thunder branches coming down etc - I do know mettalic noises like a bolt opening they do not like that at all - but man they can be dumb - I sat and talked to a young fallow stag one day he was fifty yards away I would say man you are dumb get shot one day - he would put his head up and look around but then put his head down and start feeding again- it was not until I moved he decided out of here - many years ago we chased 5 red hinds of a crop with a shotgun - we would fire at them from about 100 yds away and they would run 20 yards and stop- we fired about 5 rounds at them before they decided nah out of here and still they just trotted off - so go figure does not seem to be a set rule - but one good whiff and or a bolt rattle and gone
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