I’m sure I’m not the first to try this, but I watched a brass cleaning video where the dude used ‘Zilla Desert Retile Bedding’ it’s ground up walnut shells. I was having trouble finding media, so I ordered some. This stuff worked better than anything I’ve used. I ordered off Amazon for $12ish for 15lbs. It’s very fine, and so far I’ve found no flash holes plugged as an added bonus. I’m sold on it for sure, beats the hell outta $35 for 16 lbs. plus he mentioned Petco or Petsmart one carries it.