Not good for pumps or autos.I have never been able to get either Aguila or Herters mini shells to feed in a 500 or 870.These are best suited for single and double barrel guns(sxs,o/u).I have several inexpensive single shots cut down(20"barrel) and they kick like a mule with full power ammo,even with a good recoil pad.The mini shell OO kicks a lot less,very manageable but still enough punch for HD.