How often do you change needles?

Help Support CattleToday:

I can understand the desire and theory behind changing needles on every shot. But at the big brandings I will have a vaccination gun in each hand with 6 ropers having 3 calves stretched out at the same time. Sometimes it throws a wrench in the works just trying to fill one of the guns. There is no way a person could change needles at the pace things happen.

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