This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Encased or enclosed inside a jacket.

v. Simple past tense and past participle of jacket.

adj. Wearing, or furnished with, a jacket.

"WH cited from memory a max load of Unique with a 240-grain jacketed bullet."

jacket   

hollow-point    soft-point    copper-jacketed    158-grain    metal-jacketed    high-velocity    nine-millimeter    frangible    blunt-nosed    armor-piercing