300 ohms is too low however. That puts too much of a load on the previous stage. At 10 volts that would draw 33ma. You could check to see if the op amp can function with that much output current. Going to 1k would be better however. If i remember right, you need a gain of 10 with 1k resistors on the current mirrors and for the output stage, so the feedback and ground resistor would have to be 10k. That should work in real life although introduce a little offset. With 2mv input offset and a gain of 10, we could see 0.02v output offset. This is true of any pairs of resistor values that result in a gain of 10 however.