NUT UP.
Ass shots: Sometimes I bleed...sometimes I don't. Depends if you hit one of the tiny blood vessels or not. Usually I don't ever bleed... unless I hit scar tissue...then I bleed for sure.
Quad shots: I finally manned up and started doing them again. ...I am actually soooo digging quad shots right now. With 3/4" 27g it's a piece of freaking cake. Goes into muscle about 90% of time. Only down side...LOTS more vessels and veins in quads. I always hit them. Doesn't really hurt any more...just bleeds a bit when taking out. Yesterday I pulled out needle and a small fountain of dark red blood came rushing out. ...grabbed my pre-prepped and opened alcohol swap..slapped it on and bam over n done with. No pain or marks today. Easy. Mind over matter... If you don't mind...it doesn't fucking matter.
I love quad shots, its the only ones I'll do. I've tried glutes but can't get my body to twist like that and see what I'm doing back there. I shoot upper part of quad, close to where the leg ends and torso begins, just under the hip I guess. No pain and usually no blood, and never leaves any marks.
Another con for me when shooting glutes, I ALWAYS get left with a lump for a week or so. Not sure why... never happens when I shoot quads.