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Old March 9, 2021, 01:22 PM   #1
quillgordo
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300 Blackout subsonic with 110gr bullets

Has anyone tried 110 gr bullets for back yard subsonic plinking. If so, is it practical in terms of twist rate, and smooth operation of an AR platform?
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Old March 9, 2021, 10:04 PM   #2
dyl
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Wow that's really light for subsonic, I don't think it would work to cycle an AR.

I use 200+ grains for subsonic, powder coated lead.
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Old March 10, 2021, 07:26 AM   #3
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Practical for "backyard" plinking? No.
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Old March 12, 2021, 04:15 AM   #4
raimius
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Depends on your backyard range, for sound.
For cycling an AR-15? It probably won't work without a lot of work (gas port adjustment, light buffer, weaker spring, etc)

If you want real quiet, suppressed bolt actions are where it's at.
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Old March 12, 2021, 05:27 AM   #5
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I've been shooting powder puff loads from a .300 Blackout single shot for a few years. I'm too close to neighbors to shoot in my back yard but if I were out of town a ways, I think they'd be OK. Over at http://www.300blktalk.com they have a reloading section dedicated to light loads for single shots and bolt guns.

I wonder if one could manually cycle light loads from a .300 Blackout AR or if the light load would cause the rifle to jam.

I have to admit that a .300BO AR15 is on my want list but so are several other guns I'll probably never buy.

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Old April 1, 2021, 07:37 PM   #6
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I agree with the group, 110grn seems a bit light for subsonic AR shooting. Are you referencing any load that you have seen?
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Old April 1, 2021, 08:45 PM   #7
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Do yourself a favor and dump the 300 bk and pick yourself up a 350L upper and a few 20 round 350L mags.
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Old April 2, 2021, 09:18 AM   #8
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Quote:
Originally Posted by Urbanrecon View Post
Do yourself a favor and dump the 300 bk and pick yourself up a 350L upper and a few 20 round 350L mags.
He'll be able to shoot subsonic 110 grain bullets out of a 350L?
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Old April 4, 2021, 09:13 AM   #9
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Why would he dump the 300BLK (known for running well suppressed) for a flash in the pan 350L?
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Old April 5, 2021, 02:19 AM   #10
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I was generally just kidding but now that you ask; for self-defense with an AR at 200 yards and closer, I prefer the hard hitting 350L that will still fit up to twenty rounds of readily available cartridges per mag in an easily weildable fighting package. I don't do suppressors or reloading my own ammo although I probably should.
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Old April 5, 2021, 11:11 AM   #11
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Why dump the 300AAC for the 350L? Because the 350L is a better cartridge. At least that is my opinion.
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Old April 5, 2021, 12:54 PM   #12
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The op wants quiet plinking... since we are in another caliber war thread now, why not offer 22lr or some other pistol cartridge.

If the op had asked about 350L he would have been shot down for that choice too.
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Old April 5, 2021, 12:57 PM   #13
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Why would he dump the 300BLK (known for running well suppressed) for a flash in the pan 350L?
LOL--I'm not a big fan of 350 L either, 5.56 case wins hands down in terms of overall robustness over the 350L flimsy case (aka 9mm viagra).
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Old April 5, 2021, 10:50 PM   #14
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Originally Posted by Nanuk
Why dump the 300AAC for the 350L? Because the 350L is a better cartridge. At least that is my opinion.
Better for what? Hunting in a state that requires a minimum .35 cal and a straight walled case, I'll agree with you. Hunting in general, there are better suited cartridges than both in an AR platform. Shooting subsonics and suppressed, I'll have to disagree.
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Old April 6, 2021, 01:11 AM   #15
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More like .357 viagra.
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Old April 6, 2021, 01:17 AM   #16
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If it was really .357 rather than .355, I think it would be more popular with those that like to reload. Reloading isn't something we all do because we have to but most do it because we like the results better...

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Old April 6, 2021, 07:36 AM   #17
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More like .357 viagra.
except that the bore is cut the same as 9mm Luger.
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Old April 6, 2021, 12:32 PM   #18
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Depends on where your backyard is located. However, Hornady loads a couple 110 grain bullets. Apparently only a 190 in a subsonic load.
The op hasn't been back either.
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Old April 7, 2021, 06:15 AM   #19
stagpanther
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Winchester's own 180 gr power point is the most righteously excellent bullet for the 350 legend--it also mics at .355.

Getting back to the OP's original question--the problem I see with what he's asking is using a short-shanked bullet which I would assume creates a lot of unoccupied space in the case if getting the loads subsonic. This can result in unpredictable ignition characteristics. I thought about trying it out just out of curiosity--then I considered the potential of secondary pressure spike or bullet stuck in the bore...sounds great, you go first.
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Last edited by stagpanther; April 7, 2021 at 06:29 AM.
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Old April 8, 2021, 09:10 AM   #20
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Backyard plinking? Sound concerns for neighbors?

On a limb here. Having kids, I'd be a more ticked neighbor with you for having shot a gun in any distance than I would be about sound.

A thought on your logic
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Old April 8, 2021, 11:36 AM   #21
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Quote:
Originally Posted by stagpanther
Getting back to the OP's original question--the problem I see with what he's asking is using a short-shanked bullet which I would assume creates a lot of unoccupied space in the case if getting the loads subsonic. 
Trail Boss powder would probably do it, but then the issue is cycling in an AR which was the OP's other concern. If I had some TB I'd load it up and run it through my Ruger Ranch rifle and tell you how slow they were. M1 Carbine 110 grain bullets are cheap, but there isn't a whole lot of difference between spitzer 110 grain bullets and 180+ grain bullets suitable for subsonic loads.
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Old April 8, 2021, 11:46 AM   #22
rickyrick
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I don’t get it? Lots of people shoot safely in their backyard where allowed, I’m pretty sure we aren’t talking about downtown somewhere lol.

I had a backyard range for many years
I’ve had neighbors shoot in their own back yards too

I don’t own a suppressor, but I think they should be required and not restricted heavily.

Last edited by rickyrick; April 8, 2021 at 12:48 PM.
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Old April 9, 2021, 03:13 PM   #23
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I almost guarentee that 110 gr bullets wont allow cycling. i tried 180 gr SMKs and could not get them to work. You need a 210+ gr bullet to generate the ideal gas pressure and speed to completely subsonic cycle the bolt. Incorrect gas pressure or speed typically causes short stroking of the bolt and you get FTF's and FTE's .
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