Most I have done that I can recall:
Injectables: 1.25g test with 900mg deca OR 1200 deca 800 test, OR 1g test, 600 tren, 200 mast.
Orals: I have used up to 300mg of anadrol (Syntex) in my 20s. This was for 6 weeks. I put almost 100lb on my bench and felt no sides - I would never do it again those especially now that I am 50.
Currently at 300mg TE now for 9 weeks and the same size as I usually am at 4x the dose.
I have never seen anything really amazing at higher doses and see no reason to go that way again.