@Don29palms
There are actually a few 18650s rated for 30amp CDR. That's the Samsung 20S and the LG HB2/4/6. The LGs do not perform very well though.
@Runegod750
Mech mods are never safe. Just like regulated devices. You're always gambling with the devil.
But luckily there are many ways to mitigate the risks.
1. Do not build to the maximum CDR of a cell. If a cell is rated at 30A CDR, you can draw those 30A when the cell is brand new. After some use, the cell's maximum CDR will decrease. And this can happen
very fast, when the cell is constantly pushed to the max.
If you still want to go to the max, be prepared to buy new cells on a monthly basis.
2. Keep your battery wraps and top ring insulator in
immaculate condition. Every nick, burr or dent is disaster waiting to happen because of a hard short. And when disaster strikes, and it will do so, it won't be funny, belive me.
3. Looks don't matter.
Massive coils are the enemy.
Granted, they may look cool, but in the end they perform like s**t.
They just lure you to push the battery even harder than necessary.
That being said, your .12ohm build is way too low. Even with battery sag and voltage drop of the mod calculated in, you're still over the 30amp limit.
Aim for a resistance of .15 with your coils and you're good to go. You won't recognize a massive drop in performance, but you will benefit from largely enhanced safety.
28*4 is quite a lot of wire and mass that needs to be warmed up before you even get any vapor.
I'm absolutely no fan of simple round wire builds, but a N80 26*2/40 5 wrap coil, which happens to give you a resistance of .15ohm, is a lot more responsive, while maintaining the same heat and vapor production without pushing your battery to its limit.