Check and see if Rocky Mountain Cartridges is still in business. 10 or 15 years ago the were making CNC machined brass shells that were awesome. I purchased 20 3 1/4" 8 gauge abd 20 2 1/2" 16 gauge brass cases from them. Price, at the time, was pretty reasonable at around $6 each. They take 209 primers and are very easy to load and reload. I used them with black powder and used water glass to "glue" in the overshot card. Excellent cases and appear to be indestructible. The shell walls on the 8s are close to 50/000 inch thick.
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