Well being that the H&R is a break open design, you can follow the manufacturers instructions which is to take it down and put the breach end of the barrel in hot water for 30 mins. Then you can unscrew your breach plug and push out the load. Then you can swab the bore in the hot water and dry and treat.
IMO - You should clean it anyway regardless whether you've fired the load out or not. Even unburned powder that isn't removed will attract moisture from the air and can cause corrosion.
If it were me and my rifle - I would just shoot it. Heck, you're going to have to clean it anyway so why not have a practice shot while you're at it. It will either build confidence with your rifle or show that you need to practice more.