It really depends on where you're Injecting at.
I use 27 G x 1/2" for Delts.
For Quads I use 25 G x 5/8".
And almost everyone has there Favorite Spots and Favorite Sizes............................................ JP
to withdraw from the vial bro use a 21g so you can pull it out fast then switch the needle to a 23g 1 inch that usually what people this way its a fresh needle an go in painless if your sensitive lol go with a 25g 1 inch
He must've been injecting pudding.. Only takes me like 5 minutes between drawing and injecting . I guess it depends how big of a shot you're doing . I inject ed so I don't have to pin much each time . If you're doing 3cc then I'd stay away from slin pins lol