What is the best way to draw from a glass sustanon250/ml ampule while keeping wasting the test to a minimum? And how much is normal to waste trying to get all the air bubbles out?
You need a big gauge needle. The bigger the better. 20 would be fine. Draw it up. Change the needle. Flick the barrel with your fingernail. Push the airbubbles out. Any oil that comes down the needle is good to lubricate the injection, so dont worry about that.
What Bonez said, I use a 22 gauge.