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Originally Posted by Munchskull
So from my understanding C to C chain is a bad idea?
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The way I see it is: If you needed this CD thread to figure out if it was viable and what variables to consider, it's probably not a safe bet for you.
Regarding pin / bushing wear (the primary contributor in chain stretch) - load is a lot less of a factor on this wear than you might expect. Use in a low load or no load state can stretch chain as well. I suspect that the wear occurs as the chain rounds the bend of the sprocket. I'm just speculating here, but I imagine you could "break in" chain by just running it in alternating dimensions on the bench for a few hours. Once the initial wear happens, chain "stretches" a lot more slowly, so you may be able to get your re-tensioning out of the way early.
In 2015, my old team (2791) ran a 6 foot long chain run (so more than 12 feet of actual chain) at exact center distances. What should surprise no one is that the chain did indeed stretch, but we only had to tension it once. We did end up offsetting our mounting holes for the elevator by one half link after the initial stretch though. All of this stretch occurred before the relatively light load was placed on the chain (chain never lifted more than 1 tote ideally) .