Guys,
I finally got the paperwork completed and the lower marked so I could build my upper with a 8.5" 1:7 300 BLK CMMG pistol position gas bbl. Cute little fella. Intended for subsonic only use.
Also have a 16" 300 BLK with a pistol position Paladin barrel.
Have an NOE 311 247 plain base mold and have a supply of projectiles cast in WW and sized to .309".
Found that the 16" rifle makes subsonic velocity with abt 8.3 gr of 2400. Burns pretty clean. Have not had much chance to fiddle with it and the cast bullets much. 220 SMKs and 225 Hornady OTMs work really well and kill deer like a champ as these bullets upset on impact.
Have you had success with feeding of this projectile subsonic? Anyone try 2400 with the 311 247? What other powders have proven to be useful?
Thanks,
Mike