POI/POA shifted dramatically between each load. Holds a POI/POA shift compared to my 'normal' 308 load that allows you to expect a hit to be 1" low with subsonic as compared to a subsequent round of supersonic. TxLewis is the one who loaded most of it, and he did perfect a great load for me. Our best guess was the powder burn, depending upon the random powder distribution was the cause. It gave us different POI depending on how we manipulated the powder in the case before each shot. We noticed inconsistent groupings, so we tried things like tipping the gun forward to be sure the powder was at the nose and compared that to tipping the barrel up to get the powder at the back of the case. A couple of re-loading buddies made them for me. Never wanted to mess with subsonic 223, but to each his own. Powder does burn, just not at the slow rate of rifle powders. 308, it was often common to add fillers to make a 'full' case instead of a flash-prone cartridge with wild POI.Ģ2LR is still a better option for the application.ĭont have any problem in 308, 7.62x54, 35 rem, 30-06 shooting light loads using unique and trail boss with out any kind of filler. In a 556 case, some powders would lay flat, or bunch up and instead of a slow expansion, you had an instantaneous flash that resulted in a detonation or inconsistent round stability.Įven in. One of the issue was the fact that powder needs to burn, not flash. It's been a long time since I pursued subsonic 556. I'm thinking uniqe or similar should be a ticket. Want to see what powder you end up using. It will take some tinkering, but not a big deal. Use faster pistol powders and very light buffer spring. Load heavy bullets, 75, 77,80,90 gr pills. Yes it can be done with out much trouble.
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