Mark, RMC shells are a different kettle of fish from Magtech. They are turned from solid brass and use 209 primers. Perfect for the old guns with no real forcing cone. They will make them to your exact measurements although I found that 2 5/8" standard 10 ga fit my gun perfectly. Don't make the mistake of shooting them in a proof gun with non tapered chambers as they will not afterwards fit in your gun. David
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