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Old August 9, 2013, 11:46 AM   #1
zTimbo
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Anyone loading subsonic .300 blackout

I've got a .300 blackout SBR suppressed on its way and with subsonic ammo hovering above $2 a round I'm looking into reloading.

Can anyone recommend a recipe and where in the world I can find supplies at?
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Old August 9, 2013, 11:53 AM   #2
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Anyone loading subsonic .300 blackout

First off, do you have any reloading equipment at all?
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Old August 9, 2013, 01:09 PM   #3
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Anyone loading subsonic .300 blackout

Yes, just wondering what everyone else is doing with this load.
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Old August 9, 2013, 01:27 PM   #4
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Re: Anyone loading subsonic .300 blackout

With 208 amax I have used 5744 with between 10-11 gr charges and had them be subsonic.
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Old August 9, 2013, 02:07 PM   #5
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Nothing to add, just want to follow the thread.
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Old August 12, 2013, 04:05 PM   #6
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Anyone loading subsonic .300 blackout

Would anyone care to divulge what their cost for reloading their .300 blackout assuming that they don't already have brass
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Old August 12, 2013, 05:06 PM   #7
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Most people loading .300 BLK will convert their own brass from cut down .223 Rem.
As for the cost taking a quick look at most people's loads I would say around $0.52 a round using $45.00/100 208gr Hornady A-Max, $35.00/1,000 primers and $23.00/Lb (7,000gr) H110, 10gr of H110. Check your own load data and don't rely on other people to blow you up.
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Old August 12, 2013, 05:53 PM   #8
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.300 Blackout

Has anyone noticed any significant ballistic differences? Like what is the velocity at 100 yards and is there a significant adjustment to be made for longer ranges?
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Old August 12, 2013, 05:55 PM   #9
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Anyone loading subsonic .300 blackout

Quote:
Originally Posted by JDD308 View Post
Has anyone noticed any significant ballistic differences? Like what is the velocity at 100 yards and is there a significant adjustment to be made for longer ranges?
Ballistic differences compared to what? Non-subsonic rounds?
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Old August 12, 2013, 06:00 PM   #10
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Anyone loading subsonic .300 blackout

I was just curious how it compares to say the .300 Winchester or WSSM. I am just curious if it is worth the money to try the Blackout or just stick with a regular .300 Winchester. I am just curious about the all around ballistics of the blackout. Yeah I am curious about a lot. But I found the round intriguing just not sure if it is enough to sway me to it.
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Old August 12, 2013, 06:09 PM   #11
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Anyone loading subsonic .300 blackout

Quote:
Originally Posted by JDD308 View Post
I was just curious how it compares to say the .300 Winchester or WSSM. I am just curious if it is worth the money to try the Blackout or just stick with a regular .300 Winchester. I am just curious about the all around ballistics of the blackout. Yeah I am curious about a lot. But I found the round intriguing just not sure if it is enough to sway me to it.
They aren't even close! The .300 Win mag is pushing a bullet at 2,800 FPS, and the .300 blackout is pushing the same bullet at just over 1,000 FPS.

If you drop the .300 blackout to a 125 gr bullet (instead of closer to 200 gr mentioned earlier) it will go a tad over 2,000 FPS - but then it is not subsonic.

And if you want a .300 Win mag AR....well it's going to cost you a lot of money.

The .300 Win mag is just coming into its own around 800 yards. The .300 blackout is running out of gas around 600 yards.
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Old August 12, 2013, 06:20 PM   #12
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Anyone loading subsonic .300 blackout

Thanks that is the information I was looking for. I was wandering where the leveling out was. I am still keeping my .308 for long range but I was playing with idea to have a little bigger toy. I am still liking the idea of the .338 lapua. A little over kill around here but you never know when you may need something to knock over a pig. Thanks again for the information
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Old August 12, 2013, 06:52 PM   #13
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Anyone loading subsonic .300 blackout

Well, the .338 Lapua costs in the area of $5/shot.... If you are shooting out past 1500 yards then sure, but until then it really is not practical from a shooting perspective except just for fun.
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Old August 12, 2013, 09:11 PM   #14
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The usefulness of the .300 BLK is to have a 30cal round which can be fired out of an AR-15/M4 while using the existing magazines to full capacity, existing bolts.
To have the same ballistics as 7.62x39 when using supersonic ammo and the ability to use subsonic ammo for use with a suppressor.

The ability to fire .30 cal subsonic rounds with a supressor is the most interesting reason for most.
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Old August 13, 2013, 02:16 AM   #15
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I think that since it's such a low velocity round that it would be a natural for use with cast bullets. Anyway it sure would bring the cast per round down...

Tony
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Old August 13, 2013, 10:08 AM   #16
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Re: Anyone loading subsonic .300 blackout

Quote:
Originally Posted by Geezerbiker View Post
I think that since it's such a low velocity round that it would be a natural for use with cast bullets. Anyway it sure would bring the cast per round down...

Tony
The problem is most people shooting subsonics are using a can and shooting lead through a can is generally frowned upon
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Old August 14, 2013, 01:11 AM   #17
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Why? Please enlighten me. It's not like I can afford a silencer to find out why...

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Old August 14, 2013, 09:22 AM   #18
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Shooting cast ammo through a silencer is sometimes a bad idea due to the buildup of lead which plates out on the internals. Most 22lr cans can be taken apart for cleaning.

I have an all stainless 308 silencer (welded together) that I use on my 300 blackout with subsonic cast bullets. I keep track of the weight and if it gains too much I will soak it in a solution of hydrogen peroxide and vinegar to remove the lead and other fouling. There is a hazmat disposal site near my home where I can dispose of the hazardous lead acetate solution for free.
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Old August 15, 2013, 01:32 AM   #19
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I suppose you could soak it in Ed's Red to wash out the fouling too. It seems a little silly to me to make something like this that cannot be taken apart for a proper cleaning but I don't have much experience with these things...

Tony
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Old August 15, 2013, 09:12 AM   #20
zTimbo
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Anyone loading subsonic .300 blackout

The shop that's building my suppressed .300 upper told me that they shoot cast bullets at subsonic all the time through their cans.

This is mainly due to the availability and price of .300 ammo.

I can't believe some places are charging $3 a round
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Old August 15, 2013, 04:00 PM   #21
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Quote:
It seems a little silly to me to make something like this that cannot be taken apart for a proper cleaning
I believe that the reason most suppressors can't be taken apart is because the makers would like to keep the whole thing under wraps. If you took one apart with a little examination and a lathe it wouldn't be hard to copy it. That's bad, because the last thing we need is a bunch of Rambo's wanna be start making their own suppressors. Not to mention that the ATF wouldn't get their $300.
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Old August 15, 2013, 04:25 PM   #22
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Originally Posted by Eppie
I believe that the reason most suppressors can't be taken apart is because the makers would like to keep the whole thing under wraps.
Most .22 suppressors and center-fire handgun suppressers on the market today can be completely disassembled. However, most center-fire rifle suppressors can't, but not because the companies are trying to hide the design, but because they don't need to be cleaned and they work better if they're sealed and can't be disassembled.

The internal design of most sealed suppressers is public knowledge. Whether it's people "jailbreaking" the can and putting pictures of the baffles online, or companies like Silencerco posting videos of their sealed cans being assembled, where you can see the baffle design clearly.

I'm sure there are a few companies who prefer to keep their design as secret as possible, but the truth is that sealed center-fire rifle cans tend to be quieter and stronger and they don't ever need to be cleaned unless you're shooting lead bullets through them. The pressure is high enough that almost all the carbon fouling is blow right out of the can, and the thin layer that remains helps protect the baffles from heat and pressure and makes the can last longer, but this thin layer of carbon never gets too thick because of the huge amount of pressure going through the can with every shot.
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Old August 15, 2013, 04:44 PM   #23
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Theohazard thank you for setting me straight.
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Old August 15, 2013, 05:15 PM   #24
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Anyone loading subsonic .300 blackout

Some can manufacturers will service them for you as well if they cannot be disassembled but need a good cleaning.
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Old August 15, 2013, 05:15 PM   #25
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I reload a 245 grain cast in the 300 Blackout. The trajectory is like throwing a brick out 50 yards and you can shoot, then listen for a second, and hear the round hit the target 100 yards away. I only use the 115 grain for serious shooting out to 200 yards. The heavier rounds with less powder are like mortars in their trajectory. If you need a ton of information on reloads go to 300blacktalk.com.....
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