I would not expect WC and most SWC to penetrate a car, although a lot of cars now are built pretty lightly. For NON-LE use, I find them acceptable. I know that the BB WC loads are recommended by a pretty savvy (ex) cop who sometimes shows up here. (He got some to take to NJ years ago.)

The better answer for most LE use is a long gun.

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NHI, 10-8.