Cartridge is from Ammo Manufacture: OATH Ammo HALO 165 grain RNFP Solid  (provided by Intercooler 5/6/2015)
Ballistics Information: 10mm Auto
Muzzle Velocity: 1200 fps (shows 1500 fps on website)
Muzzle Energy: 527 ft. lbs (824 ft lbs)
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.6500"/Dia. 0.4000": 165 grain RNFP Solid
Actual weigh 167.4 grains  (flat base) 2-friction reducing bands Diameter 0.3910"
MEPLAT: 0.2580" (100% copper projectiles and they will be lighter than the lead counterpart so they will be long for weight like Barnes and others.  They also appear to have power bands where the entire projectile is not contacting the rifling; this will reduce frictional surface contact which can translate to speed increases)
C.O.A.L.: 1.2440"
Primer: Large Pistol Brass color
Case: Diameter 0.4215" Crimp Diameter 0.4220" (light) Length 0.9860"
Powder Description/Positive ID/Type/Charge Weight: ? WSF ? Tight Group ? 7.0 grains

OATH – Operational American Tactical Hardware

Is this a two-piece bullet? What is the line we see near the tip?

It is a solid, the line is just a scored ring line and probably there for the HALO name.  They are cut from a solid bar of copper.

QuoteMuzzle Velocity: 1200 fps (shows 1500 fps on website)

How does that work?

Can I buy this 165gr. all copper bullet for reloading I wonder?