Lead Bullets have a few more variables than jacketed bullets. Nobody has mentioned size yet, and the wrong size lead bullet will give you more barrel leading than the wrong load. First slug your weapon...there are lots of video's on u-tube. Then measure your lead bullets, they should be at least one thousandth larger than your gun's chamber, some guns prefer more. Usually one or two thousandths will suffice. Lead bullets are softer than copper jacketed so they usually have less pressure for the same load than a jacketed bullet. That means less powder needed for the same weight projectile. For example:If you have a load of 10 grains of Unique for a 240 grain jacketed bullet, 8 should be OK for the lead one. Don't reduce your load more than 20 percent, or you risk getting one stuck in the barrel. Somewhere is a posted load for what you have, either in a loading manual, or a manufacturer's chart. Find it. When you experiment, you should have some way to check your loads, a chronograph is a good start, and keep notes. It would help lots if you can find someone at your local range that casts and can give you pointers. This is a minimum guideline and someone is sure to add to it, or suggest something different, but the main rule is safety first. Nobody wants you to get hurt or damage your equipment. Oh, yeah, almost forgot, lead bullets need lube, if your freeby's don't have lube, you need to apply some, (Another Variable).