I recently saw someone ask a question about this, and I didn't see a thread about this in the database, so I thought I'd add it.
Q: My gear runs out faster than it is supposed to. What's the deal? Are the vials under-filled?
A: A lot of guys have trouble with that first 1ml of measuring and inaccurately measure and often take out more than 1ml of gear on accident, making it seem like they run out of gear quicker than it is supposed to. I have found syringes that both accurately and inaccurately measure that first 1ml. The reason why some syringes do not properly measure that first ml is because of the small space between the 0 ml line and the tip of the needle where extra gear can be stuck. The easiest way to solve this is to flip the syringe needle side up and measure with the top of the gear at the 0ml line to see where the bottom line lines up. Problem solved there for those who are uncertain about their measurements.
Q: How do I get that last bit of gear out of a syringe?
A: There are 2 methods of doing this. The first one is, after you have sucked in all of your gear that you will be injecting, flip your syringe needle side up and suck in about .1 - .2ml of air into your syringe. Next, you will situate yourself so that you will be injecting at enough of a downward angle, if not straight down so that the air is at the back of the syringe so that it may serve its purpose of forcing that last bit of gear out of the syringe. And if any air gets into your muscle, it will not affect you because it will be such a small amount that it will not even matter. It will dissipate eventually anyway. You can play around with the amount of air until you find out exactly how much air you need to have in the syringe in order for the syringe to fully empty itself of any gear, but have little to no gear get into your muscle.
The second method is done by using B12. Suck up the B12 into your syringe first, and then suck up the rest of your gear. Next, you will again situate yourself so that you will be injecting at enough of a downward angle, if not straight down so that the B12 is at the back of the syringe so that it may serve its purpose of forcing that last bit of gear out of the syringe. B12 is water-based, and since most gear is oil-based, it will be more dense and thus sink towards the needle and be injected first. This is also why we pull the B12 into the syringe first. If the B12 is not at the back of the syringe, wait until it comes to the top of the syringe, or at least .2ml of it is at the top. Just be careful about the pressure in the syringe when pressing. Go slowly so that you don't rocket the water-based B12 into your muscle, causing any pain.
Hope this helps.