There really aren't any pros/cons for the NOVA that you don't already know. It shoots 3 1/2" 12 gauge rounds while I believe the standard 870 doesn't. Personally, I don't know if the 3 1/2" round is really necessary in the 12 gauge, but I use them anyway because I LOVE breaking my back. I'll probably go to 3" shells this year and see if it make a difference.
Both the Nova and 870 are pretty reliable guns, as are most pumps. I have used a Browning BPS for over 2 decades. Problem is, I realized I couldn't hit anything on the 2nd shot with a pump gun, so I bought an auto. I had gotten used to using an o/u on the clays field and I just couldn't hit anything with the pump after the first shot. I realized it one day while duck hunting and then took the gun to the skeet field for confirmation. I could hardly get on the second target by the time it was going behind the skeet house. That just wasn't the case with the o/u. Since switching to an auto, I don't use the BPS anymore and I hardly, if ever, use my o/u's. The problem with autos is that they can jam. Ran into that problem shooting a tournament flurry with my Beretta 391. Only time I have run into a cycling problem with my Benelli SBE is when I used too light of a load during really cold weather.
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The pond, waterfowl, and yellow labs...it don't get any better.
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