Im probably an idiot, but Ive used a 23g needle and inserted about 1/2 inch and pinned 2cc of test/deca into my pecs.
The initial pinning hurts like hell. Pecs just dont seem to be "normal" for pinning.
Everything was gravy after that. Chest was nice and swoll, but I probably wouldnt do no more than 1.5cc ever again. 2cc was just too much, but I didnt feel like breaking my shots up those days....