What kind of Boa Constrictor do I have?

[AbsoluteApril]

It's no longer BCc an BCi, it's BC and BI (FYI!)

The tank it was in at the pet store said "Columbian red tail boa" so I just went with it. I'll probably just call it a red tail boa when talking to friends because if I call it a bci, I'll have to explain all that and I'm lazy

I would avoid 'red tail boa' as that generally is used for BC. Call it a Colombian boa or Common Boa as that is what they are supposed to be called (BI). Colombian (not Columbian) is the locality.