Cylinder vs Improved Cylinder vs Modified

[RatDrall]

I've had Cylinder and Improved Cylinder chokes in the past. I just ordered a barrel with a Modified choke barrel. What will the difference be, compared to the other two?

Thanks in advance....

By the way - There are all sorts of factory 18" 870 barrels out there, in stock, right now, if you look...

 

[rcmodel]

http://www.chuckhawks.com/shotgun_chokes.htm

Of course, a lot will depend on the size shot you use, and whether it is steel shot or lead shot, or something else.

rc

 

[oneounceload]

Here's another chart from Briley that shows what various chokes will do at certain distances:

http://www.briley.com/2009/sportingclays.html

 

[RatDrall]

Thanks for the links, very informative!

I forgot to ask - will the modified choke be a problem with rifled slugs?

 

[Pete409]

I forgot to ask - will the modified choke be a problem with rifled slugs?

None whatsoever. It may give a different pattern/grouping than the other barrels/chokes, but there is no harm whatsoever in using rifled slugs in a Mod choke....... or even a Full choke.

 

[Loyalist Dave]

Really? Learned something new. I thought that a full choke at least would compress a Foster type slug and might cause it to deflect a bit if it wasn't uniform when it was deformed. I don't use them though, prefering Brenneke style out of a cylinder bore.

Thanks

LD

 

[huntsman]

Really? Learned something new. I thought that a full choke at least would compress a Foster type slug and might cause it to deflect a bit if it wasn't uniform when it was deformed. I don't use them though, prefering Brenneke style out of a cylinder bore.

Actually brenneke can be shot thru a full choke also.

If you go to their international web-site they give the info on their slugs.

 

[Pete409]

I thought that a full choke at least would compress a Foster type slug and might cause it to deflect a bit if it wasn't uniform when it was deformed.

That's because you (and many others) apparently think that a Foster slug is sized to just fit inside the bore. The reality is that the Foster slugs are sized to be smaller in diameter than even a full choke.

It is only because of the felt wad on the base of the Foster slug that the slug is able to seal off the bore as it is pushed toward the muzzle by the expanding gasses. This felt wad sometimes falls off once the slug exits the bore, but sometimes it simply imbeds inside the hollow cavity slug.

In addition, the Foster slugs are very soft lead and would have no trouble swaging down a considerable amount if necessary, but due to their design, it isn't necessary....... even on a full choke gun.

 

[rcmodel]

And the "rifling" on a rifled slug isn't there to spin the slug as it flies through the air.

They are there to give the excess lead a place to go when fired through a choke.

Air flow over the point of a slug is like a bow wave on a boat.
It doesn't touch the sides of the slug where the "rifling" is to make it spin.

rc