Generally speaking, CCA was/is much better then later ACQ and other treatments. That because it costs less to use, so they don't have to skimp on the chemicals. The new stuff has chemicals that cost almost twice as much, so they really cut down on the treatment level unless you special order your lumber. Treated wood for pole-barn poles or house wood-foundations is considerably more expensive the standard treated wood sitting in most lumberyards and stores like Lowes and Home Depot. Same goes for the new treated SYP electric poles now being used by power companies (no more creosote treated).
The posts you mention sound like the same sort I got at Central Tractor 15 years ago. No rot in any of them. Nice to work with too, except you have to take your chainsaw out and put a point on them.
I've seen some locust last a long time and some not. When you get down to it, Locust has a natural chemical in it that kills bugs/bacteria - similar to pressure-treated wood. White oak and white cedar also have that natural toxin that keeps it from rotting. I'm going to assume that the level of natural toxin in locust can vary from tree to tree, region to region, soil conditions, etc., just like most anything else. One thing about locust though -it's harder and denser then young southern yellow pine.
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