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Contacting the manufacturer is a good idea.
I recall Ruger stating several years ago that any of their guns chambered in 223 were OK to fire 5.56 rounds in, not just the mini-14.
You could also have it throated to handle the 5.56 loads. There is an intermediate chamber, the "wylde"(?), combining the tighter 223 chamber with the more open 5.56 throat, allowing better accuracy than typical 5.56 guns, and still safe to shoot the 5.56. I believe the throat is the main difference that could affect pressure/safety. Throating is fairly simple to do.
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"Far better it is to dare mighty things, to win glorious triumphs even though checkered by failure, than to rank with those poor spirits who neither enjoy nor suffer much because they live in the gray twilight that knows neither victory nor defeat." -Theodore Roosevelt-
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