Insulin is the exception to the rule here. Where you're doing multiple SC injections per day depending on what your blood sugar looks like, it's more hassle to use perfectly proper technique than it is to just use the same needle twice.
If you have to use the same needle to draw and inject, 23 ga is as small as you can get without drawing the oil up becoming almost impossible. Standard practice for injections of drugs in oil is to use an 18 ga draw needle and then whatever size injection needle you like. The stopper is made to withstand multiple punctures (dozens) from an 18 ga needle without any issue.
Please use a separate draw needle and injection needle! It makes the whole process easier for you and it's safer, too.
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