I do site injections almost exclusively independent of what type of gear I am on. I will go into delts, pecs, bis, tris, etc. etc. etc.
With 3cc injections, I can take it just about anwhere at this point except for my tris. Maybe its something to do with the angle as I inject, but the shit is PAINFUL! Bis with up to 3cc is tough to get used to but not impossible--though you will like the look of 3cc of oil sittine in your bis (who needs synthol).