180 grain subsonic load in a ar platform

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tumbleweed
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Joined: Sun Jun 01, 2014 12:32 pm
Location: Port Lavaca Tx

180 grain subsonic load in a ar platform

Post by tumbleweed » Thu Jan 07, 2021 6:39 pm

Probably beat to death but I could not find any info on search, I just got my form1 and a can so now I am looking for load data but because components are hard to find I would like to use some I already have on hand mainly 180 grain 308 and lil' gun any thoughts?

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noname
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Re: 180 grain subsonic load in a ar platform

Post by noname » Fri Jan 08, 2021 9:28 am

Do you have someway of determining bullet speed? My goal is somewhere around 950 fps. With the supersonic crack, it is more of a range than a specific fps point to stay under the supersonic crack. With a 180 gr bullet and LG, sub-sonic in an AR you most likely will need an adjustable gas block and/or fiddle with your buffer weight to get reliable cycling. It is really hard to take someone else load data without fine tuning it to your rifle without some means of testing the load/bullet combination. Most everything less than 220 gr bullets I use my bolt gun instead of my AR.

Something else. If you have the ability to stop bolt cycling with an adjustable gas block, you eliminate about 115 db of noise caused by the bolt cycling. Makes it more or less a bolt gun.
Previously known as hardcase. Moved lost internet connection for 1+ years.

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