I use the 23 by 1in for all shots... Delts, bi's, quads, glutes, and I have not had a problem ... No knots, bumps, or anything... Just some soreness, but that is to be expected.
Just leave the .5 sticking out, I think most people use a 1inch standard overall, perhaps go as small as 5/8 for spot or up to 1.5 if their having large quads/glutes. That 23g is great for glutes/quads but you might think of ordering some 25gx1 for spot, alittle less pain/scarring makes for a smooth cycle. Good luck