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Personally I find the green tracers unappealing, so red/orange is a prerequisite.
I'd use them in a 249 (little custom box mag project) to put in 1 in 5 tracers, so obviously the amount I use would be 1/5th of my regular BBs through that gun.
Likewise, like real tracers, the goal is to help see where shots are going and walk fire onto targets/areas, so the weight and general "ballistics" (for lack of a better term) should match that of the regular BBs otherwise it isn't all that useful.
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