Based on sibling comments, that's also too much to expect of several HN readers. (Hint: shells don't leave by the front door.) I thought the most egregious howler was this one:

...a dainty, short-haired woman in high heels casually grips the gun and fires off eight hundred balls of .20-calibre [sic] metal in four seconds...

Although this is pretty bad, it would have been worse if the "balls" were described as 20-gauge as the author intended rather than 20-caliber which is just silly.