![]() Nosler’s 165-grain Partition and Ballistic Tip bullets and Speer’s 150-grain Grand Slam all averaged under an inch, as did the Nosler 150-grain AccuBond with VV N550. Take this advice from someone who has experimented. The five test loads from its 22-inch barrel averaged 0.83 inch. I suspect youll probably end up between 12.5-13.5 gr trail boss for the 220gr RN. I have also used Red Dot under a 168 SMK for some ultra-quiet sub loads but I would be VERY careful with such a fast burning powder. 30-06 sized case using win brass I ran 13.5gr trailboss under a 208 amax seated. They will be quiet but won't even make the BCG move. Anyone have any legitimate data SteveNC 2 You will have fun. Charge weight: 12.5 grains (this is NOT a compressed load never compress TB) Bullets: either the 210 grain Nosler RDF or the 220 grain Nosler CC (both bullets are about the same length 1.510') Primer: CCI Large Rifle Primers (200) COAL: SAAMI length correction > (Magpul) AICS mag length (2.87. Now is the perfect time to experiment with handy odd stuff. Due to the supply shortages, Im not sending any 175 SMKs down range. Trailboss (or SR 4579?) are your options. 1 Going to play around with some IMR TrailBoss powder with some Sierra 150gr SPT bullets for my. The powders you have will not provide enough case fill or the correct burn rate for subsonic 308 Win. Subsonic Bullet type: Sierra RN Bullet weight : 220 grain Powder type. But it would beat itself to death with any sort of full-power rounds. clays 308 subsonic load data Normal primers are fine and Trail Boss is probably. ![]() I am sure that you could mod a 308 AR to cycle, somehow, with an ultra short gas system and large gas port to do so. The 308 AR platform has a significantly stronger action spring, much heavier BCG, and requires much more force to strip rounds from the magazine, all of which make it impossible to cycle with subsonics. 308 Winchester 190 GR HDY SUB-X Hodgdon H4895. If you have played around with 300 BLK subsonics, you would see that they provide VERY little energy to cycle, even for a AR-15 action. ![]() Unfortunately I am sure that the goal of a subsonic 308 Win that cycles will ultimately be fruitless. ![]()
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