60 degree angles
If you are cutting the 3 1/2" edge of a 2 x 4, then you really do need to use a mitre saw, otherwise you run the risk of the cut not being square with the wood, and therefore any joints will be slanted.
It is a nice offer by John Mercier, too nice to pass up. And, yes, PT 2 x 4 will warp almost before your eyes. I have two PT 6 x 6s as posts holding up a portion of a small deck and they are still "moving" after 14 years!
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