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These are the guidelines we follow for volumes and injection sites per Lippincott.  We do not ever use Dorsal Gluteal.

Ventrogluteal

To identify the correct injection site for IM injection into the ventrogluteal muscle, have the patient sit, stand, lie laterally, or lie in a supine position. Locate the greater trochanter of the femur with the heel of your hand. Then spread your index and middle fingers from the anterior superior iliac spine to as far along the iliac crest as you can reach (as shown below). Insert the needle between your two fingers at a 90-degree angle to the muscle. (Remove your fingers before inserting the needle.) The maximum injection volume for this area is 5 mL.¹

Vastus lateralis

To identify the correct injection site for IM injection into the vastus lateralis muscle, have the patient sit or lie in a supine position. Ask the patient to flex the knee slightly and internally rotate the foot, if possible, to relax the muscle and reduce pain.⁴ Use the lateral muscle of the quadriceps group, from a handbreadth below the greater trochanter to a handbreadth above the knee (shown below). Insert the needle into the middle third of the muscle parallel to the surface the patient is lying on. The maximum injection volume for this area is 5 mL.¹