Ridgerunner, don't take this as any sort of personal slam:
This is the Internet. Nobody can tell if any one person is correct or not without some lengthy track record of posts and feedback over time.
The possibilities of Ridgerunner's system may work. We have no way of knowing if he's one more shot away from a damaged rifle. I'm not at all predicting; I'm saying we don't know as fact.
If anybody wishes to follow his suggestions, fine. However, as with any load development, start low and buildup slow. Do NOT jump in and immediately follow the notion of, "Well, he said he loaded it like this, so I can do the same."
I note in passing that the strength in shear of the lugs of a bolt-action rifle is greater than of the AR-15; more cross-sectional area. For a push-feed action, there is no benefit to 5.56 over .223.
I will take exception to the comments about barrel lengths and velocity loss. For there not to be a loss from 24" to 20" or from 20" down to 16", it would be the first time in my 58 years of messing with centerfire rifles that this has occurred.
There have been numerous experiments where barrels were cut back an inch at a time and a chronograph was used. Shorter = slower, invariably. And a centerfire .22 is a centerfire .22, no matter how you meddle around with the loadings.