"When full-grown, A. albopicta averages about 130 mm. in length for 8½ whorls, but exceptionally reach 176 mm. for as many as 10 whorls."
I was gonna say that I think albopicta have been mixed up with smithii to be honest, although they are more closely related to reticulata. But, Christabel has owned smithii before. I suspect they were something else entirely, its not surprising if this is the case because information is practically non-existent.