I have been using 18 Gauge 1.5" needles to draw, then switch the needle to a 25G 1" needle to inject IM deep into deltoids. However I have my wife do it as the Test C is difficult to push thru the 25G needle even if warmed up, so I let my wife do it. I don't even feel the needle go in, I do feel the effort she is applying to the plunger to force the thick oil thru the needle however. No post injection pain ever yet.
I buy the syringes at CVS.
I have been sick lately and went to the doctor. They gave me 2 shots in the upper glutes, a steroid shot and antibiotic shot. Both needles looked as big as my 18G 1.5 drawing needles lol and hurt like hell when the nurse injected both sides. They looked like harpoons. I had to turn my head and not look at them as they made me sick at my stomach to think I was about to get it with 2 of them.