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Posted: 12/15/2015 11:54:17 AM EDT
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Just started loading up 300blk for fun and to do something different...but I'm not sure how to tell which loads are subsonic?
Right now I have 115g Noslers and H110 to use. Can 115g even be subsonic? Does it have to be a heavy bullet? Are there published subsonic loads? My nosler manual doesn't say anything about if their loads are subsonic or supersonic. How do I know? I'm used to loading 223 so I don't have to worry about this stuff - it's all supersonic 
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Quoted:
Just started loading up 300blk for fun and to do something different...but I'm not sure how to tell which loads are subsonic? Right now I have 115g Noslers and H110 to use. Can 115g even be subsonic? Does it have to be a heavy bullet? Are there published subsonic loads? My nosler manual doesn't say anything about if their loads are subsonic or supersonic. How do I know? I'm used to loading 223 so I don't have to worry about this stuff - it's all supersonic 115gr can be loaded to subsonic, but will not cycle your action If you want to load subs that cycle your AR, you will need ~200+gr bullets and use 1680 or Lil' Gun (preferably) |
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What is your bbl length and gas system?
For short pistol length (i.e., 8.5" with pistol gas) my experience is 1680 is the only thing that works well with subs. For the longest time I couldn't get any 1680 so I tried all the alternatives and they didn't work worth spit. But 1680 works like a dream (bullet weights from 203gr-240gr). |
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... but will not cycle your action
If you want to load subs that cycle your AR, you will need ~200+gr bullets and use 1680 or Lil' Gun (preferably) |
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Quoted:
Have a look at Missouri bullet co. 245 gr cast bullets. They are available coated as well. I have had good luck with them but am now using my own cast 247 from NOE mold. I shot 500 of the MBC 245gr and they cycled great in my 10.5" barrel with IMR 4227. One thing I have noticed is shooting these subsonic rounds sure are dirty. I would recommend firing off some 223 through your suppressor (assuming you can mount it on another AR in 223) to clean out the carbon every once in a while. The high pressure and extremely hot temperature of the 223 will clean your suppressor right up (burn the carbon off). |
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