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Since re-barreling a Thompson is no trivial matter, I wouldn't recommend running steel cased ammo through it.
It will scratch and wallow out your chamber, most particularly after the gun gets hot from firing a little.
The cold steel on the case mouth will be harder than the hot steel of the chamber, and damage will follow.
Sure, they police departments fifty years ago used to shoot steel-cased ammo through their Thompsons... They could get new barrels pretty easily back then and on top of that, they were spending other people's (tax) money, so fiscal responsibility was not what you would call a top priority.
Just as it is with law enforcement today.
Price new replacement Thompson barrels ( if you can find one ) and the fee to have a new one put on - and then make a decision about running steel-cased ammo through your gun.
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