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subsonic loads for 10.5 AR
I have spent hours searching here, going to the links at the top of the Whisper reloading forum, Google searches, etc. for subsonic loads for a 10.5" AR barrel, pistol gas port, tp555 gas block and have not found very much information for this specific set up. What I have found, is a ton of information for "16" ARs", "14" Contenders" and other configurations than what I am looking for. I do not have enough experience with the Whisper cartridge yet, but, from many years of reloading, and common sense, a load for a 16" barrel will not give the same velocities when used in a 10.5 barrel. Is it close enough? or is the difference enough that we should be concerned? Has anyone compiled a list of loads for this set up, similiar to "BUFFETDESTROYER" s post as below? A compiled list with this information would be fantastic. So, does this exist and I have not found it yet?Or, do I have make up a spreadsheet to list online here for people to fill out? Or? I am open for suggestions and comments.
[I]07-14-2010, 12:35 PM
buffetdestroyer
Member Join Date: Jun 2010
Location: Reno, Nevada
Spook's 10.5" AR barrel (great barrel if you are on the market for one) with 1 in 8 Twist and pistol length gas system Subsonic loads:
Hoser's Lake City Brass
220 Grain Sierra Matchking
CCI Small Rifle Primer
8.5 grains of 2400
Seated to 2.13" (if memory serves) - just go to where they feed in standard AR mags which is a little less than a quarter inch from the front of the mag for mine.
I also get great results from the same above with 175 Grain Sierra Matchking or M80 military bullets (147 grain)
and 7.5 grains of 2400All of these loads are subsonic and cycle my action with M16 type Bolt Carrier Group and standard carbine buffer and spring.
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