IC, but I don't understand....

General Firearms Shotguns
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All shot with #7.5 1-1/8 oz. field loads at 10 yards. Targets are poor-man IPSC style fabricated from leftover grocery bags.

Rem. 870 with 18-inch fixed cylinder choke barrel

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Rem. 870 with 20-inch fixed improved-cylinder choke barrel

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Rem. 11-87 with 21-inch interchangable (“rem choke”) improved-cylinder choke barrel

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Rem. 11-87 with 21-inch interchangable modified choke barrel

There is hardly any difference in spread between the cylinder and improved-cylinder barrels on the 870, despite not only the different chokes but 2-inch length difference. I was expecting more.

There is a huge difference between the improved-cylinder on the 870 versus the 11-87, even though it’s the same type choke and only a 1-inch length difference. I was expecting them to be the same.

There is hardly any difference between the improved-cylinder and the modified on the 11-87. I was expecting more.

Here are the caliper-measured choke diameters (I no longer possess the 870 cylinder barrel):

870 IC – 0.724"
11-87 IC – 0.720"
11-87 M – 0.715"

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xxxxx

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Thanks for the response.

Primary use is action-style 3-gun competition. Hence the tactical-ish targets.

The match stages actually feature steel targets within 20 yards for most shotgun engagements, which a tight enough spread is needed for adequate umph to knock down. My 870 had been just showering the plates, which would remain standing while laughing back in derision. Now I can see why. Am hoping that the tighter 11-87 will enable me to get even.

What a great site! I’m going to spend some time around there.

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Shotgun chokes is a weird science in itself.

That said I need some tighter extended Briley choke tubes for Joes matches :wink: probably an Improved Modified along with some heavier loads my #8 Win SuperSport is a little too light, I think I’ll go to #6s.