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300 blackout
 Moderated by: Slingshot, Rockydog, klallen, DesertMarine, -6 Page:    1  2  3  Next Page Last Page  
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 Posted: Thu Feb 24th, 2011 10:30 PM
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ar15fanboy
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I was wondering if anyone here played much with the 300 Blackout cartridge and how hard is it to reload it.  With super sonic speed, what is the accuracy of this round at 25 or 50 yards?  Same with subsonic.  Thanks.



 Posted: Sun Mar 6th, 2011 01:34 AM
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scooter58
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I am also looking around for someone who has loaded this round.
I guess I will have to fill you in when I get my dies. I will make up the brass first.
Would be nice to hear from someone doing it already.

Scooter



 Posted: Sun Mar 6th, 2011 05:01 AM
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trickywoo
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found this on ammo website

HANDLOADING INFORMATION

If you load your own ammo, pay special attention to all of the normal safety practices. Recommended powder for most supersonic loads is Hodgdon H110.

For subsonic, there are special requirements and nearly all published loads are non-optimal for the 300 BLK upper. Many existing loads were developed for Thompson Center® single-shot pistols, or for ARs by people not aware of the magazine limitations. These loads pay no attention to automatic rifle function and should not be used. Look for a load which results in a cyclic rate of 700 rpm or more. AA1680 is recommended because its bulk density matches the case capacity and it will generate enough gas pressure to cycle the weapon.


Suggested subsonic load:

• R-P 300 AAC BLACKOUT brass
• Remington 7.5 primers
• 11.2 grains of A1680 powder (Adjust powder charge as needed. Factory ammo is 1010 fps for 16" barrel)
• Case length is 1.368 +0.000 -0.020
• Sierra 220 MK loaded to 2.089 OAL (this length is optimal for reliable feeding from USGI magazines)
• Chamber pressure 21,100 psi.



 Posted: Sun Mar 6th, 2011 06:31 AM
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Rockydog
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I believe I read somewhere that this cartridge functions best in an AR using subsonic loads with a carbine length adjustable gas block that can be run wide open for subsonic and throttled down for supersonic loads. RD



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 Posted: Sun Mar 6th, 2011 07:20 PM
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scooter58
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Thanks Trickywoo,   I was wondering about the loads for Thompson Center guns VS AR.  I am going with the AR platform on this one.   I will be making my own brass from LC Brass.

RD,

Exactly the way I am going, with an adjustable gas block,  JP Adjustable Gas System for AR type rifles.
This should be an interesting round to shoot.

Scooter



 Posted: Mon Mar 7th, 2011 11:24 PM
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scooter58
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Got my 300 Blackout  Dies today .  I had to cut the neck off before I could run it in the sizing die but it formed up nicely.  Trimmed to length after sizing.

Need some reload items to finish loading.

Scooter



 Posted: Fri Apr 22nd, 2011 09:29 PM
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ar15fanboy
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Reviving an old thread to see if there are any updates.

Scooter, what did you use to cut off the 223 case neck?  I just got my Forster BR 300 Blk dies in and getting ready to process some brass.  What powder are you using?



 Posted: Sat Apr 23rd, 2011 12:02 AM
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scooter58
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I cut the necks off on my collet lathe with a collet stop installed.
I then formed the new  case neck  using the dies and then trim to length
Polished up after that in a tumbler.

I have to get some bullets and A1680 powder tomorrow.

Still waiting for my upper to come so I can assemble it with my Blackout barrel.

Scooter



 Posted: Sat Apr 23rd, 2011 01:17 AM
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ar15fanboy
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Thanks Scooter.  I am pretty exited about this cartrdige.  I am trying to see if I should pick up a Dillon 1200B motor for the task of making brass.  Also, debate if I should try to use Unique which I have 16lbs or buy some A1680.  I picked up some Hornady 208 grain amax for some subsonic testing as well.  Please update when you make progress with this cartridge. 



 Posted: Sat Apr 23rd, 2011 01:26 AM
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scooter58
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If I didn't have a lathe i would buy a lee trimming set up that held 223 and get someone to modify a cutter to length so I could trim with my power drill.

I use this method on my 50 cal and it works very good

Scooter



 Posted: Sun Apr 24th, 2011 08:03 PM
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scooter58
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Ok guy's,  I need some input ....

I am loading 300 blk   at 11.2 gr  of  A 1680  with a 220 gr bullet, Match King.

I am setting them at 2.089 OAL

I set up my dies correctly and proceeded to run them.    I am getting AOL's varying  +- .010    what the heck????  My shells length is dead on, so I checked the bullets and that is where I figure the varying is coming from... I thought match king was supposed to be tight tolerance?  :rolleyes:

Am I missing something?? :confused: Took me almost 2 hrs to load 20 pcs.   Yes I was being anal about the tolerance in powder and AOL.

How much tolerence should I allow and not be way out with the loads?
I will be shooting from a 16" barrel  AR15.

Scooter



 Posted: Tue Apr 26th, 2011 01:24 AM
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ar15fanboy
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I do not thinking you should be too worried about 0.01".  Even at the ogive, I noticed the nosler custom competition is just as inconsistent.



 Posted: Tue Apr 26th, 2011 02:12 AM
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Rockydog
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Scooter, You can't worry about the oal unless your bullet has such a long nose that it's bottoming in the seater stem cup. Under normal circumstances the seater stem contacts the ogive of the bullet and pushes from that point. To make this easier to understand think about cutting .05 off of the tip of one bullet and nothing off another. Now seat both bullets. From the base of the case to the seater stem contact point on the ogive both rounds should be exactly the same. However one COAL will be .05 shorter than the other. It's the ogive that's the important part anyway, as somewhere along that curve is where the bullet contacts the rifling. Adjusting the length from ogive to rifling contact can have accuracy gains and losses. As far as tolerances unless you are jamming the bullet into the rifling and leaving marks on the unfired bullet don't get hung up on tolerances just yet. I'd go and shoot your carefully loaded new rounds. Enjoy the hell out of it. Grin from ear to ear. Then come back and everyone on here will help you fine tune things. RD



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 Posted: Tue Apr 26th, 2011 10:08 PM
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scooter58
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Hi Guy's

I understand about the ogive as I have screwed around with loading my Contender's & Encore's. I load with the bullet just a whisker back from the rifling.

But if I want to make the most accurate loads, don't I have to make sure the bullets are all pressed to the exact same depth??

I was really surprised to see how loose the tolerances are on Matchking bullets especially as we pay threw the nose for them.  (Not bad if you consider you couldn't make them that cheap)

Sooo... I will take your advise and shoot my bullets... Then I will report but I expect some feedback for you experts.   I want to nail a fly to the wall with it. :lol:

Scooter



 Posted: Wed Apr 27th, 2011 09:44 AM
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dlm37015
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i use aa1680 and 210 grain bullets my 300 whysper when chambered was cut with the neck too long i guess 300 blackout works in it



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 Posted: Wed Jul 6th, 2011 06:43 PM
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rsilvers
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Western Powders finished their load data:

http://www.silencertalk.com/forum3/viewtopic.php?f=128&t=73990&p=703444#p703444



 Posted: Fri Apr 25th, 2014 12:23 PM
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sig556r
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Been using Rel7, VihtN110, AA1680 & AA5744 for supersonic & AA#2, #7 & #9 for subsonic for my PSA 16" 1:8 twist.
Lower charge range aren't enough to cycle the action on ARs, though tinkering with the buffer spring may fix this, I just hover on the high end of the powder charge & watch for pressure build up (i.e., flattening of primers).
It's a no-brainer caliber if you already reload .223/5.56 (for brass) & .30 cal (for projectiles)



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 Posted: Fri Apr 25th, 2014 12:49 PM
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A pause for the COZ
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I my opinion, the 300 Black out is as close to a no brainier decision to decide to reload for.

I would recommend it as a option for new re loaders to rifle reloading and new casters.

It is about as close to a simple idiot proof cartridge there is to reload.
Works with just about any Slow pistol or fast rifle powders out there.

Can load what ever 30 cal bullets you happen to find. ANY you find will work.
Same powders give good results for cast bullet loads.

It is super easy to get good shooting loads with out having to mess around much at all.

 



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 Posted: Sun Apr 27th, 2014 01:15 AM
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I have a different opinion of it...
I built a 16" carbine length gas upper on a cmmg 1:7 barrel.
Since I don't have a suppressor, I usually shoot supers at 100 and 200 yards. Wanting to utilize the AR platform I have been trying to find a good accurate load. So far I have tested 45 different loads with 6 different bullet weights and 7 different powders and the bottom line is, I am about ready to sell the upper and be done with it.
So far the best 5 shot group I can get is 1.1 moa at 200yd. Its been disappointing to say the least.

Last edited on Sun Apr 27th, 2014 01:18 AM by Silvertip



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 Posted: Sun Apr 27th, 2014 04:50 AM
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RobertMT
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Silvertip wrote: I have a different opinion of it...
I built a 16" carbine length gas upper on a cmmg 1:7 barrel.
Since I don't have a suppressor, I usually shoot supers at 100 and 200 yards. Wanting to utilize the AR platform I have been trying to find a good accurate load. So far I have tested 45 different loads with 6 different bullet weights and 7 different powders and the bottom line is, I am about ready to sell the upper and be done with it.
So far the best 5 shot group I can get is 1.1 moa at 200yd. Its been disappointing to say the least.

300BLK wasn't designed as benchrest rifle.  Anything inside 2 MOA, will do what it was designed for.



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