.300 Blackout

[Chato308]

Just realized there's no pinned 300 BLK thread in the reloading page.

Let's build up some info for future loaders, both with Supers and Subs. Favorite powders and projectiles.

My powders of choice are currently H110, Lil'Gun and CFE BLK. Currently trying to use up all of my CFE BLK as it burns HOT and my sub loads aren't as quiet of a tone compared to H110 or Lil'Gun.

Favorite bullets are currently the 115gr SMK, 125gr TGK and 220gr SMK. 125gr range is absolute money when it comes to hunting whitetail deer and SBR length barrels. 110-115gr bullets make good speed and perform well but these 125's hit hard and penetrate well.

 

[rustyinbend]

I use IMR 4227 for both sub and super. Sub gives me 1040 ft/sec velocity, while the supers are around 1984 with a single-digit Standard Deviation. Haven't figured out how to get better SD's in subs, currently around 20, but I don't really care much about SD's in subsonic ammo since I only use those in an AR pistol and always at close range. For subs, the group size at 25 yards matters way more than any low SD. Only on the second firing, and taking my pile of fairly new Starline brass all the way through a firing before starting on the next.

 

[Stugots]

Sub load: Starline Brass, 190gr Hornady Sub-X over 8.2gr's of High Gun. MV of 1055fps per my Lab Radar.

10.5' barrel

 

[DirtDart]

Supers: win 296, sig brass, 125 sierra tgk, 19.5 @2.250
Subs: vvn110, Barnes brass, 208 eld, 9.7 @2.250. 9.7 of N110 shot the best but is over 1200fps. Went down to 8.1g of n110.
16” Douglas in an ar.
Wolf msrp

 

[MO Fugga]

20gr H110, Hornady 110 V-Max @ 2.1"
12.2gr A1680, Berry's 220 @2.1"

 

[Gary Paugh]

Love all the info, it would be great to list barrel length and gun type.
I shoot a 8" AR-15 and a 10.5" bolt action, will post some load data soon.

 

[Shifty6BR]

I'm helping a buddy setup a rig for deer hunting, here in our state of suck it is the only legal bottleneck cartridge legal to use as well as in a bolt action setup...we are deep behind enemy lines as the gas guns are currently in limbo. I personally am not a deer hunter but tinkering with handloads is my cup of tea.

Being on a somewhat budget we built it off a Savage 110 action and a 9tw 24" Bartlein in a Bravo, with the intention of sticking only with strictly supers, once again...suppressors are also a no go.

Only tested one charge weight, powder and bullet as a a quick "break in" and to get optic somewhat zeroed for actual load development.

18.8 gr H110 with a 110 vmax @ 2.1 yielded an avg of 2460 fps, I am suspecting he could reach 2600 fps towards the top of charge ladder. The 24" barrel is producing much higher speeds vs the test lengths used in the load manuals as suspected. Will report back as move up into the 125gr and possibly 150 gr.

 

[308sako]

9" BCM

110 V-Max Factory 2130 ft/secs SD 8

110 V-Max Win 296 2240 ft/secs SD 18

115 Berger FB W 296 2088 ft/secs SD 12

125 Nosler BT Lil Gun 2070 ft/secs SD 34

155 Sierra (2155) Lil Gun 1862 ft/secs SD 10

175 SMK AA 1680 1070 ft/secs SD 26

208 A-Max AA 1680 1031 ft/secs SD 12

220 Sig Factory 1035 ft/secs SD 14

220 Lapua IMR 4227 1031 ft/secs SD 4 (Favorite for quiet)

Working with my second 9" BCM and it is slightly faster, but prefers Lil Gun to W 296 with supers.

110 V-Max load

 

[ClamHammerXpress]

10.5” bbl

 

[ClamHammerXpress]

10.5” bbl 2.09 coal (approx)

 

[ClamHammerXpress]

Notice this is 3 DIFFERENT CHARGE WEIGHTS, each with it’s own recorded shot velocity/energy data respectively. One shot for each weight, each corresponding weight noted to the left..

10.5” bbl
H335 (13, 13.3, 13.6 gns) - 175gn BTHP

 

[ClamHammerXpress]

10.5” bbl

 

[FuhQ]

Plinking load:

WCC (Winchester) 5.56 NATO cases cut down and reformed
Berry's 220 TMJ
10.0 gr of Alliant Power Pro 300-MP
CCI 450 primers
~ 1085 FPS from a 16" barrel

Precision load:

R-P (Rem) .300 BLK brass (I hate R-P brass, but they're doing ok in these low pressure loads)
Berger 210/215 or Nosler 210 RDF
10.5 gr of Alliant Power Pro 300-MP
CCI 400 primers
~ 1085 FPS from a 16" barrel

 

[wvfarrier]

Lake City Coverted Brass
Makers 200gr REX
9-10 grains of H110 (velocities 950-105)
Expands to 2"
1.15" groups at 100 yards from a 16" bolt gun

Same Brass
Lehigh 115 Controlled Chaos
19.0 grains of Lil Gun (spicy load)
Shoots MOA out my PWS MK111
Super effective hunting load

 

[DubfromGA]

Hoping to contribute to this thread....soon.

Hopefully those contributions won't be in the form of comedy due to demolition pics of baffle strikes, squibs, double charges and other goofball moves that I will attempt to avoid.

Finally got my first can this week....mounted optics on two new .300 BO rifles......have powders, primers, shiny new brass and a small assortment of bullets. What could go wrong ???

 

[DubfromGA]

Running into a snag.

I'd like to get rolling with the components I have on hand but am not finding the exact load data to mate up with what I'm most interested in trying.


For example....I have a pile of 220gr Blue Bullets (coated cast ) and several pounds of Shooters World Blackout. Haven't found load data specific for these together.

I did, however, find data for those bullets & H110. I loaded a few yesterday, hopefully to try out this afternoon.
Figured if nothing else they'd be somewhat useful in getting optics zeroed.

Hopefully I can get onto some solid data using the SW Blackout powder.

I'm confident it will work well with subsonic loads. I've seen where it is compared with 1680.....but am without confirmation of a 1:1 charge weight relationship. Very apprehensive with reduced loads in the first place.



Have a few of these to trail as well.

May add some Berry's 220gr, too.

 

[DubfromGA]

Friggin' hell.

Don't know if I'm going to get to the range today or not.


I was getting my gear together an hour ago. Intended to use the rifle case that my AR-10 was currently in.
Stood there with case in hand, unzipped it....removed velcro that was joining the handle loops....reached for the handle loop but unknowingly only grabbed one.....rifle fell directly onto my foot....BUIS smacked down right on it.

Fortunately I've yet to mount anything on it other than those irons.

Unfortunately 45 minutes of icing hasn't done much for the immediate swelling.


Fukkin' dumbass.
Mad as hell, but not as mad as I would have been had the intended ATACR been on top. Not wanting to drop test the Nightforce.

Get in a rush and do dumb sh!t and win dumb prizes. Fukkin' moron.


To hell with it....I'll leave the shoes unlaced....might as well wear a flat brim ball cap....and wear my belt below my arse. Wonder if I can pull off the look of a mid-50's wannabe rap artist....
They know me too well there....I'll just have to limp and b!tch about it. Fit right in if it is senior citizen day.

 

[DubfromGA]

Sub load: Starline Brass, 190gr Hornady Sub-X over 8.2gr's of High Gun. MV of 1055fps per my Lab Radar.

10.5' barrel

Granted, I've only returned to reloading a year ago following a 25 year absence...I hand't heard of High Gun powder.
Looked it up...and there it was.

I've seen Clays and other "shotgun" powders used in cartridge recipes....first time seeing High Gun.

 

[thedude824]

Doesn’t seem like others have had the same issues I’ve had. With my original 8” upper I was getting excellent results with 19.8 grains H110 under 110 vmax in Starline brass seated to 2.1” Any longer wouldn’t load. I got no primer cratering or over pressure signs. In fact it was very consistently sub MOA.
I built a new upper with an 11.3” Wilson Combat barrel in Vltor MUR upper. I shot some of the previously mentioned loads and I initially didn’t notice the cratered primers until primers started blowing out. Then I inspected the other brass and found badly cratered primers. Additionally I had to mortar a couple rounds as the rounds jammed into the lands.
So I pulled all of those and will resize the brass. Plan is 19.3 grains H110 and loaded at 2.05”. A lot of the data said to load at 2.0”, but that was completely nonfunctional when I initially tried it.
I also loaded some 220 grain SMKs at 2.24” but those would not load either. I’ll try them at 2.11”.
I’ll chrono both.
The initial build used a carbine buffer tube, H2, and Law Folder. I’m now building a Griffin MK2 lower with A5 tube and A5H2 buffer.
Once I go through these Vmax, I’ve got 300 125 SST that I can use. After that I’ll try to grab a couple bulk boxes of Speer 125 TNT since this rifle will now be my run and gun Night Vision rig.

Any additional load data WITH COAL would be greatly appreciated

 

[MO Fugga]

If anybody is using Gordon's reloading tool, and you're looking for the 1:5 twist data that it doesn't have, ChatGPT has the data extrapolation formulas.

 

[MO Fugga]

Friggin' hell.

Don't know if I'm going to get to the range today or not.


I was getting my gear together an hour ago. Intended to use the rifle case that my AR-10 was currently in.
Stood there with case in hand, unzipped it....removed velcro that was joining the handle loops....reached for the handle loop but unknowingly only grabbed one.....rifle fell directly onto my foot....BUIS smacked down right on it.

Fortunately I've yet to mount anything on it other than those irons.

Unfortunately 45 minutes of icing hasn't done much for the immediate swelling.


Fukkin' dumbass.
Mad as hell, but not as mad as I would have been had the intended ATACR been on top. Not wanting to drop test the Nightforce.

Get in a rush and do dumb sh!t and win dumb prizes. Fukkin' moron.


To hell with it....I'll leave the shoes unlaced....might as well wear a flat brim ball cap....and wear my belt below my arse. Wonder if I can pull off the look of a mid-50's wannabe rap artist....
They know me too well there....I'll just have to limp and b!tch about it. Fit right in if it is senior citizen day.

Did you ever get those tested?

 

[softcock]

110 V-Max load

I have 2 night rigs, and one rifle cal. I been running for many years is .30BLK in a 16" Boltaction with 110 Vmax'x . it a great Coyote Caliber in boltaction that hits pretty hard. With the BLK and 110's I always work the BLK/110's anywhere inside the 150 yard range on the dogs with this rifle.
I just always throw an even 20-grains of Win. 296 . I tumble all the 110's in hBN before loading . I usually toss the Brass after the 2nd reload because it hard on the Pockets .
Today .. 1st Round, dirty cold bore shoot on the Garmin.
-

-

 

[thedude824]

I loaded up some subs and supers for the new 11.3” Wilson Combat barrel.
My old load (which was perfect in my Aero build) was blowing out primers on the new build. That was 19.8 of H110 under 110 grain Vmax with COAL of 2.11”.
I did 19.3 H110 under the same bullet at 2.12” and it was beautiful. I have no magnification on this build, but I’m very confident it’s at least MOA. The 5 round group was touching at 50 with no magnification. Velocity was 2237 - 2250.
I did 220 grain SMKs over 10.5 grain VV N120 and that was phenomenal and produced a velocity between 975 and 1010. I wish I could remember exactly, but I believe they hit about 3” low from my 50 yard zero for supers. I was shooting through a Velos LBP and it suppressed the subs far better than my HUXWRX Flow 762. I may try another .1 to get just a smidge faster. I’d like to be above 1k but less than the low estimate of 1045.

 

[MO Fugga]

I want to try V-Max and 18.5g Lil Gun @ 2.1". Gordon's says it'll do 1900 in my 5.5", but I got 1940 out of the 20g H110. Beats the Hornady Black by 60. Happy camper indeed!

 

[SNB]

I just always throw an even 20-grains of Win. 296 . I tumble all the 110's in hBN before loading . I usually toss the Brass after the 2nd reload because it hard on the Pockets .
Today .. 1st Round, dirty cold bore shoot on the Garmin

This is a pretty good velocity for 110 grains and 16". I wonder what the average velocity is for this charge.
So far, the fastest I've ever shot at 16" were the factory Hornady 110 Vmax. Avg-2370fps
They were also the most accurate.
Since my first shot also always has a higher velocity, but then the Avg is 40-50 fps lower.
Did you use a drop tube for this charge? I'm trying to figure out which of the two powders available to me Accurate N2 vs CFE Pistol will provide maximum velocity on a 16"bolt gun for 110 Vmax.

 

[softcock]

16"SS , 5R ,1-8 twist, and use cci 400 primer . Boltaction . Yes I just do 20 a even 20 grn on the charge of 296 . Primers actually dont even look bad at all.
I tumble all my 110 vmax in hBn nano lube, and buff off and load . I pretty sure that is why I can squeeze 2500+ Vel, out that thing with zero problems.
And YES, the 1st Round dirty cold bore shot on the 300BO with 110 vmax's is always just a little higher Vel. than the next followup shot . but mine not as big as your spreed of 40-50 .
Not using a drop tube on the fill .

I got a bag of those new NAS3 cases coming in on an order . So now I really going to see what kind of Vel. I can squeeze with those and a little more case volume to fill .
.

 

[softcock]

Bump Up ... NAS3 . I going to just edit/adding info to this post as I move along with these cases and 300BK .

today I had to attempt to get a feel for the NAS3 case 300bo / 110 vmax's . I only did 9 rounds today so I can just wrap my head around the steel case and bigger volume.
Now I got solid info to start working up and actual load to be a keeper . Started @ 2447 fps, Ended up with my short introduction to NAS3 , and I am up to ( 2585 fps Vel ) now . I will load some more up tomorrow, and go out Monday get some better solid feedback when I really push it up.

2585 fps . No stiff bolt lift . Lift and extraction feels exact same as with slower speed on the brass case loads . Primers still sitting a little proud with round edge . The stock Rem. bolt Firing Pin Hole is printing just a little mushroom.

I am impressed to say the least, and for a self defense or hunting round ( imho ) juice is going to be worth the squeeze .
.
Edit Add:
Also here is a big deception in that there no Brass flow on Bolt face with case having steel base. That is also a big indicator of Hot Load common with brass case when you push to far.
.
edit add again .
I got to ( 21.5 grn. ) of Win. 296 . with 110 Vmax's . ( 2580 fps ) I have Zero problems on NAS3 cases, primers, bolt lift, or sticky extractions in 16" barrel length ( Bolt Action ) and NOT an AR15 .
This is 1.5 grain. higher than I would normally take the 300bo case load using new Brass cases, with getting normally 2430 Vel.

also THIS ---> I could Not gain anymore Vel. FPS on the loads from 21.2 , 21.4 , 21.5 grn. and using Garmin Chrony. and the wall was hit right in the ( 2580 fps Vel. ) area . . So I stopping there for now .
--
Edit Add:
Ended up with a load @ 2520 FPS Vel. with the 110 Vmax's . it's 1 MOA @ 100 yrd. and that good enough for me for night hunting, as this rifle is never used past 150 yrd. at night . The extra Vel. gained is just a little more energy added impact using NAS3 .
--
Edit Add: 10-10-25
( Bolt Action ) . I been Reloading the 300BO cases with Neck size only . Not using a drop-in Bushing type Die I normally use on other Cal's . I using the Redding Neck-only Die with the pull-threw Button . Just lube well for the pull-threw .
Also a Big Plus+ on Seating Bullet . the Factory NAS3 case mouth 'flair' that is there when New. Seem to remain there after running threw the Neck Die.
--

Here is a Pic. to represent Case Fill Volume Difference @ 21.5 grn. Win 296 . New Sig. 300 BLK Brass, and the New NAS3 steel cases. sideXside . Sig brass on L-side . NAS3 on R-side .

.

.

 

[db2000]

Seekins SP8 and Radical Sinter Ti
Garmin Xero

1/4/24
54F 39% 30.01in

255 Sub-X 0.310 resized to 0.308 (Lee sizer)
A1680
GM205M
COL 1.3500 new starline brass
BTO 1.625
COAL 2.18 approx
9.0 817, 844 fps, won’t feed or lock bolt
9.5 891, 876, 895
10.0 926, 907, 936
10.3 943, 947, 935
10.4 978, 969, 937, 963, 935, 952
937, 962, 973, 950 1.7” at 50y
10.5 962
10.6 999, 974, 948, 965, 958, 979
978, 1002 1.2” at 50y
Ejects but doesn’t cycle new round even with AGB wide open
10.6 is probably max case fill w/ 255 gr