B. OTT,
About 4 years ago I decided to buy a rifled choke. I first became aware that they made them when I was working in this gentleman's house. Of course this gentleman was a hunter.I noticed he kept a winchester 1300 out on his porch during duck season. I started asking him questions aboutits accuracywhen it threwslugs.I told him that my father had a winchester 1300 with a rifled barrel that couldn't shoot worth a lick. He then told me that his was a smoothbore with interchangeable chokes and that it was the best gun he has ever owned. He told me he hunts duck, turkey, rabbit and deer with it. However, he told me that when he first baught it, he used a improved cylinder choke and modified cylinder choke to shoot (rifled slugs) with it. He said that he couldn't get a good group with it at all, he tried all different brands of rifled slugs too. Since he didn't have funds to buy another gun he was discouraged because he didn't want to sell a gun that was so good at everything else. But he still wanted to big game hunt with it too.So, at a local gun show, he spoke to a man there that had a booth open and was selling all types of chokes. He went up to the booth because he wanted to buy a new turkey choke. Thats when he seen a choke that said rifled on it. He inquired to the man about it and asked him if it would work and if he had one that would fit in a 1300 winchester. The man had one there and this guy baught it. He went out and baught some good quality sabots and went to the range.

This gentleman said that he couldn't belive the difference in his groups. He was getting the best groups ever out of any shotgun he had ever shot.

Thats what encouraged me to go out and buy one for my 870 12 ga.
I purchased a briley diffusion choke at a local trap shoot. I went out and baught some partition golds. I too was very supprised at the results. At 114 yards I was fitting 15 shot groups in an area smaller than a tennis ball. It's not tack driving, but at 114 yards with slugs, its darn good for me. About 2- 2 1/2 inch groups lets say. and thats not 3 or 5 shots either. Thats 15 shots (ALL) in that area.

For the cost of 40- 60 dollars, I would give it a shot in your 870. You might just be suprised. Hopefully everything works out well for you, GOOD LUCK