I used Fiocchi 69 grn once and it worked just fine on a Fallow and a lot of wallaby, and I cant see any reason why their 55 grn won't. Seeming you don't hand load .223 I would just use what shoots best. Last week my mate was shooting Fallow with a mild 55 grn hand load no trouble - probably about the speed your Fiocchi are doing. He shoulder shot a couple (55 grn Hornady) and they died proper.
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