Check out spot injection.com its easy you wont have any problems bro i pin shoulders all the time no longer then 1 inch 23 gauge will work best with 25 gauge being a good 2nd choice.
There is an actual medical study (i.e. no bro-science) that compared delt injections vs glute injections using deca. When the delt was used for the injection only half of the actual compund was absorbed as compared to a glute injection. I'll dig up a link to that study..
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