There used to be a round called the Remington SP4xBB, I don't know if they still make it.
Anyhow, I believe it had 9 rounds of #4 shot, and was followed by a few layers of BB's. Pretty nasty stuff. Wish I could find them still...
The Flechette rounds are pretty cool, I had the opportunity to get a case of them and missed out on it, unfortunately.
Spark
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