syringes measure volume.
a 3cc syringe will hold 3ml. how many mg is 3ml? well, that depends on the concentration of what you're shooting. if substance is 250mg/ml then you need 1ml (or 1cc) to get 250mg.
1ml x 250mg/ml = 250mg
if its 100mg/ml then you need 2.5cc
2.5ml x 100mg/ml = 250mg
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