Is 400mg of test decent for first cycle?

[BigIsBad]

Use the least amount that makes your grow.

Yup

 

[Big_Ed]

Use the least amount that makes your grow.

QFT! My first cycle was 450mb/wk of Test and I couldn't have been happier. No reason to jump on huge doses your first time out of the box. Find out how your body reacts before you start bumping up the doses.

 

[BiggJuicy]

Even if it only puts you a little over high normal, that's still enough to make gains.

OP: "more is better" doesn't work with AAS. Start on the low side, see how it goes and then adjust as needed. Take it from somone who made his fair share of mistakes with this stuff over the past year.

More is better does work with aas. But you need to start slow and asess your tolerance. If you find you're one of the people that can handle more and your diet and training are in check, then every increase in aas will increase the size of your muscles. But it will also increase the side effects
If you are over 25, have low bf, are healthy, and are tapped out of natty growth, 500mg a week won't hurt. But you might be able to grow off 400, hell, you might even grow off 300. Never know.
Listen to your body and be safe......good luck.