My opinion on CM stocks:
I have a comment from Mr. Roy Jinks in a history letter on one of my Combat Magnums which wears football grips (K316xxx) that since the original advertisement flyer for the Combat Magnum showed non-relieved Target Stocks then they would be correct.
However, I've seen early CMs with football grips and no evidence that they were replaced. Since very few K-frame target grips were numbered it is nearly impossible to tell which style shipped on a CM.
I suspect some may have randomly shipped with non-relieved grips until the inventory was depleted.
Again, just my opinion.

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John