"SEC. 3. Prohibition on possession of certain ammunition.
(a) In general.—Section 922 of title 18, United States Code, as amended by section 2 of this Act, is amended by adding at the end the following:
While we usually don't talk about the caliber of shotguns, the barrel (and ammo) of a 12 gauge tyipcally runs around 0.73 caliber and a 20 gauge runs about 0.62 caliber.
The penalty for driving around with a shotgun shell rattling around in the cab of your pickup?
“(11) (A) Whoever knowingly violates section 922(dd)(1) shall be fined not less than $50,000 and not more than $100,000, imprisoned not less than 10 years and not more than 20 years, or both." Emphasis on the word "shall" is mine.
Proving that you did "not know" you were in possession will be on you.