Just remember hatchery Rhode island reds aren't actual RIR they are production reds.
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The Australorp record was a long time ago. Has not been duplicated lately and the majority of Australorps aren't even close. Plus they have a tendency to go broody.Australorps and Rhode Island reds probably your best bet.
And Im pretty sure Australorps hold the record for best egg layers not Leghorns. tho leghorns are still probably in the top 5 for best layers.