7/28/2023 0 Comments Subsonic 223 that cycles![]() What I find is that the first shot is the fastest, and typically each shot is slower, and slower (with an occasional exception) This is what I am seeing (just the powder weight is listed) I am just getting an idea of where I am, so 5 of each: The components are: Hornady V-Max 55gr Moly Coated, Primers are CCI Small rifle, Powder is IMR TrailBoss. The time in between finishing one group of the same powder charge and starting the next was perhaps a minute or two (if that matters) I load the magazine for the next load and start over. ![]() From one shot to the next is perhaps 15 to 20 seconds. I shoot one shot across the chronograph, record the speed, pull the charging handle, ensure I am not pointing at the face of chronograph, and pull the trigger. The firearm is suppressed with my Form 1 can. The subsonic rounds do not cycle the action, making this into a 'straight pull' bolt gun. No modifications have been made to the gas system. The firearm is an AR-15 SBR with a 11.5" barrel 1:9 twist. This powder yields very stable results from my 300/221 (300 Whisper) The powder is all from the same 8lb keg I have been working from for a couple years now. I don't use this method for regular reloading, but when I am making 5 or 10 of one charge, then 5 or 10 of another, I take extra care to ensure that the charges were as identical as I can make them. Then I pour it into a RCBS 1010 beam scale to double check it. I have found that my scale doesn't like to hold its zero, so I pour my charge into another powder pan, zero the scale and weigh it again. 223 subsonic round I am working upįirst, my method: I weigh the charge using a RCBS 750 electronic scale. I'm working on load development and I have noticed something very unusual going on with a.
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