There is no minimum caliber, and it is not up to the instructor's discretion.If this was the same class I was in I think the way he phrased it was that in his class, you had to shoot at least a 9mm (same as 380) on his live fire course for him to qualify you.
Not sure they ever said the law said you had to carry a large caliber.
And yes there was a little bit of misinformation from various instructors about some things. Nothing major IMHO. The usual BGOS BS about stopping to pee on the way to the range.
After all, MD firearms laws are confusing by design.
But overall I thought it was pretty good myself! A great group of instructors volunteering their time.
Both are a crock of frosh