Sierra still offers .223 diameter bullets for the hornet. Generally any post WWII rifle should have a .224 groove diameter. The only rifles you would likely encounter with the smaller diameter are the winchester model 43 and the savage 23D, and I haven't seen either one in a long time. I did see a winchester 43 quite a few years ago, chambered for .218 bee. It was in pristine condition and the price was jaw dropping.
The new browning low walls certainly have a .224 groove diameter.
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