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You are using the 23 gauge to draw the oil from the ampule and than transfer to a vial.....if you are also using a 23 gauge to draw from the vial every time you backfill the insulin syringe you are most likely going to lose some in the tip every time due to dead space.

You would be far better of to use the insulin syringe to draw the 13 IU from the vial than inject as there will be minimal waste using a insulin syringe (fixed needle) since they are low dead space.