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@gbj_tester
Nope. Both Sir Isaac Newton and xkcd et.seq. have commented on this, as well as all sorts of people interested in terminal ballistics. The sectional density of crayfish is quite low, so getting them through more than about an inch of RHA isn't going to happen however fast* they're going when they hit it..
*for practical values of "fast". If you stick your crustacean in a light gas gun, you can probably get it up to about 5000m/s, but it would technically be bisque when it emerged from the barrel, but it will still have roughly the same effect as whole crayfish.