Clean, shoot, and shoot some more. From what I've heard, it's best to use regular loads at first to break in the cycling then move on to +P if you want.
Ahh. Yeah, I just assumed he was referring to long guns.
For semi-auto handguns, I'll try to run at least 1000 rounds of training ammo, 115 gr FMJ for my 9mm and then I'll run a box of HP to test for function and POA/POI.
All of my ARs, I just cleaned the gunk off, ran some patches and then ran the gun at the range with no cleaning until I am at home after the range session. That's what I'll be doing with my new AK and may not clean until I reach regular intervals.
I don't beleve chrome lined barrels need or benefit from the shoot one, clean, repeat, then shoot a few, clean, repeat procedure. If I ever get a custom barrel from my Rem 700, I'll just do what the barrel manufacturer recommends.
IIRC, it's about 50/50 as to whether or not you need to do the shoot/clean/shoot a few/clean method.