I was pinning with 18g for a few months lol I had started testosterone replacement therapy (TRT) and still new to everything and didn't bother to check what guages were the needles. the wrapper they come in are 23g attached to the syringe but, the ones that are seperate that you're supposed to use to draw are the 18g. well i was watching the youtube videos at that time on how to inject, and in the video he has the one syringe with needle attached, and he draws with this one and then takes it off and replaces it with the fresh needle and injects.
Well I just followed exactly what he did and after a couple months I posted here asking, why do I keep bleeding? because I know it can happen sometimes but, it was happening to me like all the time, and people were mentioning ways to avoid it like keep the pin in for 20-30 sec. etc. but nothing was working. So I ended up giving slin pins a try in the delts and haven't looked back, now also doing quads and triceps and everythings been going great.
Anyway I eventually found out the reason I kept bleeding was when I had receive my latest shipment of meds. and I couldn't find the 25g ones and so I kept looking and looking and then I finally noticed that the syringe already has the 23g on it, and the extra needles are the 18g. so because I was following that youtube video. I was drawing with the 23g and then I would take it off and put the 18g on to inject lol when i finally realized this i thought this was strange that they would do this, this means that you have to take your 23g syringe, take off the needle, then put the 18g on, then draw, then take the 18g back off, then put the 23g back on. damn glad i'm just sticking with slin pins now, so much easier!