Same gauge and length I use. You need 1 1/2" pins for glutes if you've got a lot of muscle back there. 1" won't go deep enough.
Use 18ga for filling the syringe, then change to 23ga for injection.
I drop the syringe with capped needle into a tall pilsner or champagne flute (They're in the same cabinet with the gear... don't laugh.) filled with warm/hot water to heat the oil before injecting. Goes in smoothly even with the narrow gauge pin.
-BigLittleTim





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