I just got my .300 Whisper Barrel for My AR. I love it. But I am having difficulty with a subsonic load using the Lee 200 gr boolit. I can get a Subsonic load, but not yet got one to Cycle the action
Does anyone have any experience getting one to cycle subsonic with 200 gr cast?
The barrel
16.25"
1 in 10 twist
Carbine gas Position
Gas port size .125
Adjustable JP gas block
I have
Red Dot
Blue Dot
2400
1680
Rx 7
Super sonic load
125 gr Sierra JSP
20.5 gr 1680
2000 fps
Works great and good groupings so far.