Originally Posted by
snapper1982
improved is more open than a modified.
if you are using a screw in choke barrel use an improved cylinder if you CAN NOT find a cylinder choke. you want the absolute least constriction on the slug as possible to ensure no deformation. if you plan to use it alot i would suggest sending it to a choke maker and having them form a choke to your barrels specs.
Yes I know an improved cylinder is more open than a modified. I was suggesting an improved cylinder first to try but then left the modified choke along with anything more open as options. There are chokes that are more opened than improved cylinder too and so I was suggesting anything from modified to more open chokes. I maybe should of worded my post better.
The improved cylinder is what I have found works the best for me with a couple different kinds of foster (rifled) slugs. My 870 shoots a ragged hole (around 1 inch actual group due to the fosters being so big) at 50 yards off the bench with a 26" barrel and bead sight. I would have no problem shooting out a little farther either. The Remington sluggers and Winchester super x rifled slugs in 2-3/4" works great in my gun but I suggest buy as many different brands and seeing what the gun likes best.