On original Elite i got to Dangerous or Deadly, cant remember.
On Frontier i got to Elite.
Using Panther Clipper I had so many shields(over 300tons) that i used to let the enemy ships just smash into me, My shields would go down from 100% to 97% then quickly recharge.
I was invincible unless on the very very rare occassion that i came across a imperial courier with a 100mw beam laser on the front which killed me and my shields in around 5 seconds.
I only ever seen that happen though 2 times in about 700hrs of play or more.
Using the above technique made it easier to get to Elite Status, Just go to an anarchic system,forward time, get some enemies,forward time again and bang you got 4 kills, rinse and repeat.