It should measure .71 inches, but actually was a little tight and measured .707 inches.

This brings up an important point in this discussion…

Different guns marked with the same choke size, will often have different actual bore sizes.

No really big deal, but just something we ought to know about.

Well, let's see if there is very much difference, or "improvement" with the Modified over the Cylinder Choke.

We will shoot the same rounds that we shot in part one, just to be able to compare the data.

I will shoot the three guns on the same target, with the Maverick (Open bore) on top, the 870 (marked Cyl) in the center, and the 1100 (marked Modified) on the bottom.

We will use the same ammo we used in Part One.

Time to get to work.

We will shoot the groups at 10 yards, which is actually a long distance for most home defense situations.

First, the Wolf 00 Buckshot.

We can disregard the holes made by the wads, but notice the three patterns.

They are very similar in size and shape.

How about some Remington Managed Recoil 00 Buck.

Again, not much difference in pattern size, but interestingly enough, the tighter choke in the 870 actually had a larger pattern than the Open Choke gun on top.

Let's try some Remington 0 Buck.

This load has 16 pellets, but the patterns were not much different in size.

Notice the wad stuck in the paper.

I hated to shoot up that 0 Buck, as it was the last that I had and it is hard to find.