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Not sure if the mini shells have enough power to cycle the next round.

1 hour ago, silverado427 said:

Not sure if the mini shells have enough power to cycle the next round.

They don't.  Some folks have had limited success using them SAs that have adjustable gas blocks but they just aren't dependable.  They are troublesome in many pump actions too, but there are aftermarket shims for the shell elevator that take care of that.   I don't think manual action rifles have any kind of mag limit.

The minis are an interesting idea, but not interesting enough for me to pay the crazy price they sell for.  I don't see any practical use for them.  However, since I reload, I'm thinking about making my own 6 pellet loads to mess with.  For, uh... science, yeah, experimenting.  Not that they look fun or anything. 

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I bought couple of boxes a few years ago and I have the original Opsol gen 1adapter.  I never shot, them and I don't know if I would trust the adapter in a HD situation. 

  

I have a KelTec KSG, so i can load a LOT of mini shells.

I use them for practice at the range and to help new shooters get used to a shotgun.

I've never had a failure, but I always have the gun loaded with regular shells when it's in the safe...