How do you break in a new Barrel?

[Wild Geese 1]

I can’t make heads or tails over the division in steps to break in a new barrel. They range from, lube, shoot once, clean, lube, and shot one round again; repeat 100 times. To lube, shoot 40 rounds, clean, lube, and you’re good to go.

I have a new 20” heavy BlackHole .264 and haven’t been able to locate its recommended break-in steps. What break-in methods have worked for you guys/gals?

Tubbs final finish