IVE BEEN TOLD,THE BIGGER THE WHOLE THE HIGHER RISK OF INFECTION,NOT TO MENTION THE PAIN WITH 23 GAUGE,JUST TRYING TO HELP A BRO OUT!CHECK OUT-www.spotinjections.com
No disrespect bro, just wanted to let jakson know about my experience with 23G needles. I believe you are right about the size of the hole, but it would have to be quite large (ie 18-20G). In terms of pain, I don't find it very different from 25G. The thing I like with 25G is that they are less intrusive (ie: less chance of striking veins etc...).
Jakson: You probably just hit a vein or artery on your way in...no biggie. You might have better luck with 25G needles.