Venison:
Here is an item you should look for:
http://www.choreboyscrubbers.com/
They are Chore Boy copper scrubbers. About the only caveat is to NOT use them with a solvent designed to remove copper, as you will find that this solvent tends to dissolve the Chore Boy.
WalMart carries these, and since there is a WalMart just about everywhere you shouldn't have a problem getting some.
Another good place to find brass wool is at a woodworking shop, like Rocklers
http://www.rockler.com/retail/retail.cfm
The idea behind using brass or copper scrubbers is that these metals are
softer than the steel that makes up your barrel, thus ensuring that you would only remove the contaminants in your barrel and not the steel of the barrel itself.
If you use the wrong product to aggressively clean your barrel, you could round-off the lands and grooves that make up the rifling in your barrel.
I do know that some alloys of Nickel have a high Hardness rating, so I would be careful using Nickel pads.
I have used the Lewis Lead Remover tool and I broke it the very first time I used it to clean my forcing cone. The concept is great, but the components could be manufactured to be a little bit more robust, IMHO.
I have used the brass screens provided with the Lewis Lead remover tool and a brass jag along with some JB Bore cleaning compound to scrub the barrels of my revolver to a mirror finish. I highly recommend the JB Bore compound