For race motors, they get two 15 minute session to get broken in and seated...first session no revs above 5500 and all throttle at 1/2 to make good pressure against the rings...second session increase the revs by 250 RPM per lap to 8000. After that, let her rip...I get twice the ring life as I do bearing life breaking them in that way. I don't use synthetic oil in my race motors, but it is for a reason unrelated to the rings.
Street, I drive no more than 4000 RPM with no more than 1/2 throttle for the first 800 miles using non-synth oil. I changed the oil (again non-synth) and start increasing the revs 500 RPM per 100 miles so that aroung 1400 miles I am running 7000 RPM. I only do light load pulls on the motor when first starting to get to this range - i.e., lower gears and lower throttle, just letting the motor spin up freely and trying to notice any vibrations or noises that are abnormal. After this, I use my judgement as to how hard to rev the motor - it is still tight.
At 3000 miles I take a leakdown on the cylinders when it is hot - if it is not below 3% - I do another 2000 miles on non-syth oil just to make me comfortable that I have got a good seat. Don't know that it makes a difference, but it has always worked for me.
Kirk