Wow 500mg/ml is EPIC strength!!! I've never scene anything above 400mg/ml.
At this strength, its almost inevitable that you'll have some significant side effects, such as extreme PIP and even flu-like symptoms if you inject it on its own. I should know, I just went through these same sides with Test E that is 400mg/ml.
In order to prevent these negative symptoms, either dilute the test e shot with whatever other anabolics are in your cycle or purchase some sterile filtered grape seed or cottonseed oil and cut the concentration of the test. Without either of these 2 options, I'd say it's highly likely you'll be experience some insane PIP at the very minimum.