If you've been looking for a reliable cannon ball sinker mold, you probably already know how expensive pre-made weights have become at the tackle shop. It's one of those things that doesn't seem like a big deal until you lose three or four heavy weights to a snaggy bottom in a single afternoon. Suddenly, you're out twenty or thirty bucks just in lead. That's exactly why so many of us eventually decide to take matters into our own hands and start pouring our own.
There is something strangely satisfying about the whole process. Beyond just saving money, there's a certain level of self-sufficiency that comes with melting down scrap lead and turning it into perfectly round, functional fishing gear. If you're tired of overpaying for stuff you're likely to lose anyway, getting a good mold is the first step toward never buying a sinker again.
Why the Cannon Ball Shape Works So Well
You might wonder why someone would choose a cannon ball sinker mold over a bank sinker or a pyramid mold. The logic is actually pretty simple: physics. The spherical shape is the most aerodynamic—or hydrodynamic, in this case—form you can use. When you're fishing in deep water or areas with a ripping current, you want your bait to get down to the strike zone as fast as possible without drifting halfway to the next county.
Because the weight is concentrated in a tight ball, it cuts through the water column with very little resistance. It also doesn't "helicopter" or spin as much as flat weights do during the drop. If you've ever dealt with a tangled mess of leader line because your weight was spinning like a propeller on the way down, you'll appreciate the stability of a cannon ball. They're the go-to choice for salmon trolling, bottom bouncing for halibut, or even deep-drop reef fishing.
Choosing the Right Material for Your Mold
When you start shopping around, you'll notice that most molds are made from either cast iron or aluminum. Both have their fans, but they behave a little differently when you're actually working with them.
Aluminum molds are incredibly popular these days, especially for hobbyists. They're lightweight, they don't rust as easily as iron, and they heat up very quickly. Because aluminum is a great conductor of heat, the lead stays molten a bit longer inside the cavity, which usually results in a smoother finish on the sinker. Most of the precision-machined molds you see online are aluminum because it's easier for manufacturers to cut clean, detailed cavities into it.
Cast iron molds, on the other hand, are the old-school workhorses. They take a while to get up to temperature, but once they're hot, they stay hot. This can be a benefit if you're pouring a massive batch of weights all at once. The downside is that they're heavy and can be a bit more fatiguing to handle if you're doing hundreds of pours. Plus, you have to be careful about storage so they don't turn into a block of rust in your garage.
Safety and Your Workspace Setup
I can't talk about using a cannon ball sinker mold without mentioning safety. Melting lead isn't inherently "scary," but it definitely demands respect. First off, never, ever do this indoors unless you have a professional-grade ventilation system. A garage with the door wide open is the bare minimum, but honestly, doing it in the driveway or a backyard is much better.
The biggest danger isn't actually the fumes (though those aren't great for you)—it's moisture. If even a tiny drop of water gets into a pot of molten lead, it causes what we call the "steam explosion." The water turns to steam instantly and sprays liquid lead everywhere. Always make sure your mold and your scrap lead are bone dry before they get anywhere near the heat.
You'll also want some basic gear: * Leather gloves (welding gloves are perfect) * Eye protection (a full face shield is even better) * Long sleeves and pants (no flip-flops, please) * A sturdy, stable heat source
The Pre-Heating Secret
One mistake a lot of beginners make is pouring molten lead into a cold cannon ball sinker mold. If the mold is cold, the lead will "freeze" before it fills the entire cavity, leaving you with a wrinkled, ugly sinker that might not even be the right weight.
Before you start your first real pour, set the mold on top of your melting pot or use a propane torch to get it hot. You want the mold to be hot enough that the lead flows into every nook and cranny. Usually, the first two or three pours of any session are "throwaways." You just drop the lead back into the pot once it solidifies because those first few pulls are just there to bring the mold up to the perfect working temperature.
Inserting the Eyes and Hardware
Most cannon ball weights require a brass eyelet or a stainless steel loop so you can actually tie them to your line or clip them to a weight release. This is where a quality mold really shines. A well-made mold will have specific slots that hold the wire eyes perfectly in place while you pour.
It's a good idea to buy your brass eyes in bulk. You'll find that they're pretty cheap when you buy a pack of 100 or 500. Some guys like to get creative and use heavy-duty crane swivels instead of just wire loops. If your mold is designed for it, casting a swivel directly into the weight is a pro move—it helps eliminate line twist even further. Just make sure the swivel is rated for the kind of fish you're targeting. There's nothing worse than losing a big fish because a cheap swivel pulled apart.
Sourcing Your Lead
Since the whole point of using a cannon ball sinker mold is to save money, you shouldn't be buying "clean" lead bars from a retail store. That defeats the purpose. Instead, look for scrap. Tire shops used to be the gold mine for lead wheel weights, though many have switched to zinc or steel lately. If you can find an old-school shop that still has lead weights, offer them a box of donuts or a few bucks for a bucket of scrap.
Roofing companies are another great source. They often rip off old lead flashing that is incredibly pure and easy to melt. Just keep in mind that scrap lead is often dirty. You'll need to "flux" the pot—which basically means tossing in a bit of beeswax or sawdust to help the impurities (dross) float to the top so you can skim them off with a spoon. Once you've skimmed the junk off, you're left with shiny, clean metal ready for the mold.
Maintaining Your Mold for the Long Haul
If you take care of your cannon ball sinker mold, it'll literally last a lifetime. For aluminum molds, the main thing is to avoid scratching the inside of the cavities. Don't use a screwdriver to pry out a stuck sinker; if it's sticking, your mold isn't hot enough or it needs a light coating of mold release spray (or even just some soot from a candle).
For iron molds, a light coating of oil after they've cooled down will prevent rust. Just remember to wipe that oil off before you use it the next time, or you'll get a lot of smoke and some funky-looking sinkers. Store them in a dry place, ideally in a plastic bin or a dedicated drawer in your toolbox.
The Joy of the Finished Product
There's a real sense of pride when you open that mold and a shiny, heavy, perfectly round cannon ball falls out onto the workbench. When you head out on the boat with a tackle box full of weights that you made yourself, the sting of losing gear on a snag or a toothy fish doesn't hurt nearly as much.
You start looking at your gear differently. You can experiment with different sizes—maybe a 6-ounce for drifting the flats and a 12-ounce for the heavy tide rips. Having a variety of sizes at your disposal without having to run to the store every Friday night is a game-changer. Plus, it's a great way to spend a rainy Saturday afternoon when the weather is too rough to actually get out on the water. Grab a mold, find some scrap lead, and give it a shot. You'll probably wonder why you waited so long to start.