They are not steel worthy unless so marked.
Have cracked all 4 Of the original flush mounts shooting steel, every one less than full, to include cyl.
If you want to shoot steel, go extended.
I came back to this thread after a few hours, to add a little more detail on the cracking of choke tubes. The Hulu design, has all of the threads that hold the choke tube In the last quarter inch at the muzzle. Other choke tubes are threaded their entire length. I found, that my tubes got progressively more difficult to unthread, and then ultimately cracked.
You can get extended joke tubes with the Hulu style thread, where all of the choke is outside the muzzle, and then you dont have to worry about cracking anything or bulging anything.
So Ive never bought any replacements, just broke the tubes.
Last edited by ClapperZapper; 06/01/20 08:29 PM.