I have a Beretta Silver Pigeon shotgun and I noticed that some of the choke tubes say no steel and others say steel ok. What makes a choke tube incompatible with steel shot? I hold one of each in my hand & can’t see a difference between them. Do you think it would be ok to shoot a non toxic other than steel through them? A couple places I like to hunt pheasant require non toxic shot because the USFWS has done a lot of work for waterfowl habitat. Or should I be looking for after market choke tubes?