There are a few things to consider such as the quality of each product. You can burn metal in a charcoal fire just fine, using soft or hard wood but hardwood being the hotter with a smaller amount of charcoal. Since you use more charcoal so for the prices and amounts you quoted, you may be better going with the coal depending on it's quality. You also need to consider the area you're in too. Charcoal is more acceptable it seems since people will think you're just having a bonfire, that is if your area allows backyard fire pits. It also depends on what you want. Charcoal is more historically correct for most periods but coal is hotter and faster for production work imo. Ultimately, the choice is up to you but I would go with good coal if I was paying for charcoal. Luckily, i get it for free and i keep the farmyard clean at the same time.
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