Howdy Jayson - I'll try to make this as consise as possible. The ways for lead levels to increase in your body from "bullet lead" not "chemical lead" as used in products like fuel and paint is through entering the body via your orifices. That being your mouth and nose. And you do have to watch your eyes. Without being gross or picky, yes, the other orifices count too, but you would really have to be trying to get lead into your body in those cases.
The main victims of lead poisoning in our hobby are bullet casters. They are dealing with molten lead. The toxic fumes are roughly above 900 degress F. Fortunately, they cast in the 700 range give or take. However, here is were there problem lies, not only with casters, but reloaders as well, as well as anyone handling lead. While lead in its solid state is not absorbed into or through the skin, it does find its way into the body through the carelessness of the lead handler. Here is how:
Smoking, eating, rubbing eyes, picking/rubbing/blowing nose while handling lead. IT IS IMPERATIVE TO WASH HANDS WELL BEFORE DOING SO! Because there are micro traces of solid lead on your hands from handling.
It sounds so simple, yet is so hard when it is 100 degrees in the shop and you need to wipe your eyes or scratch just the inside of your nostril.
Or- you grab a tissue to pick you nose to get that bothersome nugget out of there and your tissue has a blow out, Darn it!
Your are thirsty and grab a coke, when you pop the top your thumb brushed the rim of the can where you going to put your mouth.
It's easy to raise your lead levels, but easy to watch what you are doing.
As far as cleaning guns - Can lead traces pass through the skin? Yes, with the proper carrier. Is Hoppes the proper carrier? who knows? If that is a concern, you can always wear latex/surgical glovers while cleaning your guns.
I cast bullets for a living. I shoot competition every weekend. I am a timer/operator or help on the line when I am not shooting, so I am exposed to other shooters "lead" smoke. And, I reload every week. and I spend hours cleaning at least 4 guns a week. So as you see, I have high lead exposure every day of the week!
I get my lead levels checked twice a year and they are very high. But not so high as to need medical treatment.
I doubt your blood levels are a fraction of what mine are.
I don't think you have anything to worry about.