I tried several brands of the saboted slugs out of the rifled barrel of my .870. They were all the 'hot' sabots. 1900 fps or better.
The impression I got from them was in the form of welts and bruises... but I can't say the accuracy was much to get excited about. Then I heard that the stock rifled barrel on the .870 was not meant for those higher speed slugs. So I went with the much less punishing (to me) foster rifled slugs. I actually got better groups... but it might be because I wasn't nearly as flinchy shooting them.
That's my experience.
