Wilson Combat Stainless 16" 6.8 SPC II barrel
This is my hunting rifle
Optic- Leupold 2-7x33mm duplex crosshair
120gr Hornady SST's - Deer / Hog Load
loaded to 2.295" OAL
H4198 24gr = 2470fps - 2500fps
Win Large Primers
Groups 1/2" at 100yds
Loaded in Hornady brass
CCI 41 primer
Gave the same Point of Impact which was intersting
Under 1/2" - a little tighter group
Didn't chrono it for velocity
H4198 gave a lot of gas pressure so I use a heavy spring with a standard buffer and bolt function / lockup / consistency is solid.
A standard buffer spring was too light in function for the amount of gas pressure I encountered.