I got 23g BD pins yesterday from naps. I decided to use my 25g pins that I ordered somewhere else, it may be a little slower, but its a big injection difference. I draw with 18g.
Drawing with an 18 g. is good although I use a 23 g. to pin , I have used 25 g. but notice very little if any diference in comfort , however a 25 gauge needle takes much longer to inject the goods . I wont go over a 23 gauge needle for glute injections .