All i have are 25g 1 1/2" pins and both ass cheeks are sore so I used my right quad. I stuck it all the way in. My bodyfat is around 14%. The shot didn't hurt as bad as normal, could I have gone too deep?
On small muscles I would say yes, but not on glutes or quads. I use 1 1/2 " 25 ga for all my injections, but I have enough size that it's not a problem!