Thread: AR15 .300 Whisper / Blackout help

hardy built your AR ? yea i was hoping to hook up with spanners next time hes back and do something similar, be intersted in some more details about opening up the gas port and reamers used for sure! thanks for the loads till will have to try the 225z

Originally Posted by 300MAG

In my 300BLK with 16" barrel I had to open up the gas port a little to get it to cycle subsonic. Dan Hardy wasn't sure what size hole would work with subsonic so set hole for supersonic, anyway our local gunsmith had a drill reamer the right size, now works for both. Also found Hodgdon LILIGUN to work really well in both sub and supersonic with a lot less pressure signs - 125gn Nosler at 2295fps and 110gn V-Max 2395fps. I liked the 225gnBTHP Hornady for subsonic, was accurate with a soft skin that worked well on goats. Great little round on goats, the supersonics are by far the best proformers.