DR bypass is not included in the damage calculation with Powder Burns (fire and pierce damage, NO DR BYPASS)
http://s8.hostingkartinok.com/uploads/images/2016/06/731b86ec9ad52d48da271ea1eb6f3a9f.png
http://s8.hostingkartinok.com/uploads/images/2016/06/8bca07eff248c3057867b5e5d12a6836.png
without Powder Burns (pierce damage with DR bybass)
http://s8.hostingkartinok.com/uploads/images/2016/06/7315dc349157b3b127da7734f472645c.png