.224 Lake City 62 gr. FMJ-M855

You can probably use that data, but start at the min and work up watching for pressure signs. You will not get great accuracy with that bullet so what I do is work up till the action cycles reliably and call it a day. If you are trying to duplicate factory M855 loads I can save you some time and effort, just don't, you won't get close.

Accurate powder has 5.56 data on their website.....you can run loads up to 63,000 psi in a gun with a 5.56 chamber. DO NOT use this data on a .223 chambered gun.

I loaded some 55 grain Nosler's using 5.56 data and AA2230. 25.3 grains shot great.

How does one know when his load is approaching 63K psi in his gun?

If its a 5.56 chamber, he's using published load data from accurate powder, even the max load should be safe. They wouldn't put it out there, if it would blow a gun up.