I can 100% recommend using mixed stainless steel shot, never be tempted to get normal carbon steel as it degrades so quickly. Be sure to look for a shot mix that has a nice variety of different shapes. Mine has lots of shapes including long pin like pieces, balls, angle cut pins, planetoids, cylindrical pins. The more variety you have, the more likely the shot will burnish all those little nooks and crannies in your jewellery. I got my shot mix years ago and it's still going strong, I bought it from one of the jewellery supply shops in the jewellery quarter but can't remember which. It cost about 15 pounds at the time. In addition to the stainless steel shot, I put in a handful of plastic shot which is pretty much just small round plastic ball bearings like they use in plastic BB guns. I always find adding the plastic shot just brings out a nicer shine and it only costs a pound from the pound shop for a big old tub of it. For your barreling compound, you can use specialist barreling/burnishing soap which you can easily get from the usual jewellery suppliers or you can use normal washing up liquid. It's up to you, but the compounds are specially formulated for tumbling so they seem to perform better than plain old dish soap
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