I reiterate; "most" thin wall tubes are not recommended for steel shot... in the more open constructions, you can probably get away with it... but I wouldn't attempt F or IM or even Mod when the manufacturer won't stand behind the practice.
What ever. They are out there if one wants them, more types every year that passes . Just not in what you are familiar with using which is fine
If one does their home work they can easily get what they need even for steel shot. Yes they run maybe 20 bucks a tube or more than standard lead ones but they are readily available. Even the barrels with no extra meat in them that could not be fitted before they can fit an extended style now thin wall spectrums where the choke is really out side the barrel like the colonial super steels from what I seen. Once Briley have the barrel they will give you the options and can do magic in old gun barrels from my experiences with them. They have done vintage fixed choke 10ga, 16, 28, 410's for me which I never thought could have choke tubes but all do now. Most 12ga I have had done in canada and never did a 20ga so far
In fact there was an old 1100 just last week on the EE fitted with the colonial supersteel thin wall tubes
Cheers
One example
Briley Thin Wall Flush Choke
If you have a Briley Tube the bore size may be marked on the side of your tube set. Choke constrictions from Cylinder to Extra Full, in .005 inches (.127mm) increments let you precisely match your load to the shooting conditions. Choke site flush into the barrel, and choke features highly polished interior for less pellet deformation; reduced fliers and tighter patterns. Knurled grasping band speeds installation and removal.
Our Vasco (VX), or All shot type thin wall chokes can handle all type shot, while the lead/bismuth only chokes are only suitable for lead and bismuth.
another
COLONIAL THIN WALL CHOKE TUBES (SUPER STEEL)
$29.43
PRODUCT DESCRIPTION
Colonial's tough blued steel extended choke tube is designed to take steel shot abuse, so your barrel doesn't. Steel shot may bulge even the toughest, thickest shotgun barrel at the choke, gradually destroying not only pattern density but the barrel itself. Plus, the battering also jams the choke tube threads into the barrel threads, making removal extremely difficult. Our solution to the problem is Super Steel tubes with the choke beyond the barrel. Made in the USA...
But hey I am no expert on these so best check with the manufacturer. Just an old dude that probaly has more types and styles than the average bear. Here is my box of extras I don't use on a regular basis
