likely ,he means the choke was opened up to at least Mod. Other than Damascus barrels I can no reason you can't shoot steel..
If in fact it was opened up!
Nothing a $10 digital caliper can't prove.
Quick check is with a dime. Dime wont fit in the end of a standard 12g barrel with a full choke. I have some extras around. Couple bucks each. You pay shipping lol



























