I don't have an adjustable gas block on any of my rifles, so I do the buffer lock back tests as stated above, but that is mainly because that is my only option.
I think it is fairly common practice to do coarse adjustments first and fine tune from there. You only have so many options available with the buffers so start there and tune with your gas port from that point. I don't know that there is an absolute correct way of doing this as long as the end result is a rifle that functions with a wide selection of ammo.
ETA: Hopefully someone chimes in with the absolute best way, with solid reasoning behind the approach. Learning new stuff is great.
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