I've never shot steel through a full choke but a few people have told me that this is a no no.

Anyone have firsthand experience with this? Would it cause damage to the shotgun?

Just wondering..

I only asked because I have a set of twins...

The short one will take steel but range in limited..

The long one (30 inch full) is the one I don't want to hurt but thanks for the input..

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A couple of things to note.
First. running steel regardless of size of shot through a full choke is not recommended by any firearm manufacturer.
As stated earlier steel does not compress like lead, and possible damage or ringing of the choke may occur, maybe not after 25 shots, but who knows after a hundred or more.
Further to this, steel will likely not pattern very good from a full choke anyways. Lots of old dyed in the wool waterfowlers could'nt wrap their heads around how a Improved Cylinder choke could give the old full choke defined patterns. (70% of all the payload into a 30" circle at 40yds)

Second point is what makes you think barrel length has anything to do with the effective range of a shotgun? Most modern shotshell propellents are burnt up in the first 20" or so of barrel, so effective velocity is pretty much un effected.

The choke (effective contraint of the shot) is what defines the effective range of a shotgun. If 70% of all the shot wil go into a 30" circle at 40yds you've effectively got a full choke pattern, irregardless of the choke tube your using. Try Modified for stuff smaller than BB"s, and IC for shot BB and larger.

Here is some articles on the subject:
http://www.chuckhawks.com/shot_info.htm
http://missourioutback.com/Stories/lesson5.htmlhttp://www.gunnersden.com/index.htm.shotgun-patterning.html
http://www.shotgunworld.com/bbs/viewtopic.php?f=2&t=220783&start=0

Good luck

Write your shotguns manufacturer.  We have a few different shotguns.  I contacted the makers and it varies by gun.
For example, my trusty marlin goose gun with full choke is just dandy for not only steel shot excluding only the two largest pellet sizes(which I've never even seen), but is also fine with slugs.  Whoodathunkit?

My auto 5 "can" be shot with steel, but a "slight bulge" in the barrel can happen, which won't affect strength of the gun, but...........  My auto 5 is just for shooting clay and doing our best Tom Knapp impressions anyway.

My old wingmaster with modified choke slings steel like nobody's business, although I suspect it's not the best for it.

It's worth contacting your manufacturer rather than listening to internet opinions;  (including mine      )

By the way, my old marlin bolt consistantly put's 17 #5 lead pellets in the kill zone on a lifesize turkeyhead target from 80 yds with 3" shells, so go right ahead and laugh at my long barrel.