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Discussion Starter · #1 ·
Post up what you have found, process, powders, bullets, Brass, Dies, super sonic loads, sub sonic loads, pitfalls to avoid,
I think I have decided I'm going to add this to my line up this year. I'd seriously like to hear from those who are reloading 300BLK.
 

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I either reform brass from 223/5.56 brass or I just buy a whole bunch from east coast arsenal. I use rcbs ar series fl dies. I use AA1680 powder for subs and H110 for supers exclusively. I use hornady 208gr and sierra 220gr bullets for subs and speer 125gr tnt for supers. The biggest pitfall to advoid would be brass that is not formed or sized correctly. Get yourself a sheridan case gauge well worth the money. Here are my main loads
208gr horn over 10.7gr A1680, lake city brass, oal=2.11
125gr tnt over 17gr H110 , lc brass , oal=2.07 "super accurate for me!"
I shoot a aac 8 inch sbr
 

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Discussion Starter · #3 ·
Thank you vertigosol. :?

No one else is reloading 300BLK :icon_think:
 

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I as well was expecting more to chime in here. I am considering starting to reload them myself and was looking forward some good sub-sonic receipts.
 

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Thank you vertigosol. :?

No one else is reloading 300BLK :icon_think:
My buddy does, but I don't know what powder he's using. He got some cheaper bulk bullets made for 300 blk supers (somewhere around 125 gr) and I think he has some TNT's as well. For subs, he had some 208 A-maxs, but he's been having a hard time finding them and I can't remember what he's using now for subs.

Almost all of his brass he cut and reformed using Lee dies.
 
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I have reloaded a thousand rounds or so. If you are loading subsonics with anything else than 1680 you are messing up in my opinion. I buy brass from blackoutbrass.com, formed from lake city surplus. I buy lead coated 203 grain projos from palmettoprojectiles.com. these projos are dirty cheap, brass and projo and powder included I am at under .35 a round
 

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I have reloaded a thousand rounds or so. If you are loading subsonics with anything else than 1680 you are messing up in my opinion. I buy brass from blackoutbrass.com, formed from lake city surplus. I buy lead coated 203 grain projos from palmettoprojectiles.com. these projos are dirty cheap, brass and projo and powder included I am at under .35 a round
Agreed 1680 is THE powder for 300blk. tried 5744, h110 and lilgun but 1680 is the best for consistent subs and meters great. I hear good things about the 203gr palmetto projects. I haven't used them because of the extra steps of having to expand and crimp because they are lead
 

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I purchase all my reform brass from North Carolina Brass as they have the best price thus far. I use H110 or lil gun. Use at your own risks. CA can't own suppressors therefore, here is the loads I exclusively use as it gave me the best results out of my KAC SR30 14.5".

Bullet type and weight: Sierra - 125 grains HP MatchKing
OAL: 2.210"
H110 - 17.9
Lil-gun - 16.7
 

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Not quite true about the 1680 being the only powder to use for subs. Yes that is all I use in my AR for subs but if you are talking Handi Rifle (got my wife one) and/or a bolt gun in 300 blackout you want to try light subs using Trail Boss since you don't have to worry about cycling the action. They are CONSIDERABLY more quiet then the >200 grain projectiles in an AR platform. Tallhoffer is there more specific question you have about the round? They have an entire forum dedicated to the round for a reason, lol. :wink:
 

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I purchase all my reform brass from North Carolina Brass as they have the best price thus far. I use H110 or lil gun. Use at your own risks. CA can't own suppressors therefore, here is the loads I exclusively use as it gave me the best results out of my KAC SR30 14.5".

Bullet type and weight: Sierra - 125 grains HP MatchKing
OAL: 2.210"
H110 - 17.9
Lil-gun - 16.7
check out east coast arsenal brass. I ordered about 2k from them and have had no real issues other than a few stragglers in the batch
https://eastcoastarsenal.com/product/300-aac-blackout-reformed-brass/
cheapest for me other than rolling my own
 

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Agreed 1680 is THE powder for 300blk. tried 5744, h110 and lilgun but 1680 is the best for consistent subs and meters great. I hear good things about the 203gr palmetto projects. I haven't used them because of the extra steps of having to expand and crimp because they are lead
Itit is extra work. For the prices is worth the extra effort in my opinion. It is probably 10 times cheaper or more then using non lead bullets.
 

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I've reloaded a few 1000 rds of .300 so far. Started by converting .223 brass and sizing using lee dies when ammo was scarce. These are some of the loads I've used:


12gr 1680 behind 220 SMK (avg 1012fps)
10.7gr 1680 behind 208 AMAX (avg 1027fps)
10.8gr 5744 behind 208 AMAX (avg 1014fps)
5.9gr Trailboss behind 110gr VMAX (avg 1036fps; Won't cycle, obviously, but super quiet)
19.5gr H110 behind 110gr Nosler Varmageddon (Not chrono'd yet)


Platform is an AAC 9" with 7.62SD


Has anyone tried loading 240 SMKs? With the bullet longer than the cartridge case I wonder if you can seat the bullet far enough to avoid magazine problems.
 

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Well - if we can ever get this:
Talked w/Frank and got to see a demo; 82gr frangible copper/plastic mix - good accurate trajectory to 200m - around 1200fps..now for the demo saw this shot at a steel plate
muzzle 6 inches at both 3 degrees and 6 degrees ... just wow...puff and no damaging splash to backdrop....CRAZY GOOD!


Vapor.jpg

Vapor1.jpg
 

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Discussion Starter · #16 ·
Has anyone seen or have concerns about bullet stability with some of the short barrel lengths and a suppressor, or is the quick 1:7-1:8 twist rates make it a non issue. It doesn't seem like there is and I'm just asking, my 762-SD is a long suppressor, so humor me with a stupid question. :wink:
 

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You're not going to have an issue with a short barrel with the round because of the fast twist rates. Of course standard practices apply when first mounting your suppressor on a new rifle to make sure the barrel was threaded properly at the factory.
Has anyone seen or have concerns about bullet stability with some of the short barrel lengths and a suppressor, or is the quick 1:7-1:8 twist rates make it a non issue. It doesn't seem like there is and I'm just asking, my 762-SD is a long suppressor, so humor me with a stupid question. :wink:
 

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Has anyone seen or have concerns about bullet stability with some of the short barrel lengths and a suppressor, or is the quick 1:7-1:8 twist rates make it a non issue. It doesn't seem like there is and I'm just asking, my 762-SD is a long suppressor, so humor me with a stupid question. :wink:
I have the same suppressor on a 9" and no issues/concerns thus far.
 

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Has anyone seen or have concerns about bullet stability with some of the short barrel lengths and a suppressor, or is the quick 1:7-1:8 twist rates make it a non issue. It doesn't seem like there is and I'm just asking, my 762-SD is a long suppressor, so humor me with a stupid question. :wink:
I have no had any issues w/my 8.2" 1-7 twist was using a 7.62 SD now a SF mini
 

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Discussion Starter · #20 ·
Of course standard practices apply when first mounting your suppressor on a new rifle to make sure the barrel was threaded properly at the factory.
Yeah, thats a given :wink:
I figured the fast twist rate was for stabilizing the big .308 bullet in the short barrel lengths but I did just want to ask for piece of mind, I don't like to run anything under 16" in .308 but I know this is a whole other animal.
 
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