300 AAC Blackout Supersonic load data

[dwalker460]

I know that a lot of work has been done in the subsonic area for this round, but I am more interested in loading it supersonic. Poking around on google I have found a decent amount of load data, but it seems like the development of supersonic loads is a bit stagnant.

My intended use is hunting antelope out here and whitetail deer back in Tennessee. What I think I want is a 115-125gr boattail leaving at around 2800 or so fps, which (I believe) should make the round effective out to and beyond 200yds.

I get that the case is a very efficient design and think I have a good understanding of the powder selections out there currently being used.

That said, is anyone out there (meaning here, near me) pushing the supersonic loads? Any promising load data so far?

[G__Fred]

Contacted bolt Alliant and Accurate Technical desks to see if they had developed data.

Accurate: Provided the attached file.

Alliant: Stated that they have not yet secured a barrel to test and develop loads.

:Cool:

[dwalker460]

Cool, and pretty much echos what I have found.

[spqrzilla]

My intended use is hunting antelope out here and whitetail deer back in Tennessee. What I think I want is a 115-125gr boattail leaving at around 2800 or so fps, which (I believe) should make the round effective out to and beyond 200yds.

Then I think you picked the wrong caliber. Because that ain't happening in any load data I've seen for .300 AAC by about 500 fps. Hodgdon's website has data for H110/WW296, Lil' Gun, IMR 4198 and IMR 4227 powders. Their data puts 110 grain V-Max bullets near 2400 fps.

6.8 Rem SPC will get closer to that but you'd still have to drop down to around 100 grain bullets. .30 AR Remington would have been the caliber for the performance you are describing.

[dwalker460]

Found the Barnes blacktip bullets. Load data shows about 2400fps and extremely good expansion even at low (subsonic) velocities. Looks like it will make an excellent deer gun out to about 150 yards or so.

[Colorado Osprey]

Barnes 2400 ft/sec with a 110 grain bullet is not legal for big game hunting in Colorado.
Colorado requires 1000ft/lbs at 100 yards for antelope, deer and elk.

You load is shy by almost a 100ft/lbs of energy at 100 yards.

Finding a load for hunting with the 300 ACC is near impossible without greatly over pressuring the little case. To be legal you will need over 2600 ft/sec

[dwalker460]

I get that a lot of people don't actually read the first post in the thread, but in this case it would help since I specifically said hunting in Tennessee not Colorado and nothing about using it for elk.

he furthest I've ever shot a deer in Tennessee is 200 yards, so not really sure why need anything much bigger than the 300. Poking around over on the 300 blackboards I see that hunters are taking dear between 100 /165 yards.

Basically though, the comparison to the 30/30 cartridge is pretty good, and that round has taken every game animal in the US at some time or the other.

[DFBrews]

You did say antelope out here which also requires the 1000 ft lbs

[dwalker460]

No antelope for me anytime soon Im afraid, did not manage to grab any tags this year. Should have mentioned that earlier, and actually starting to look like no hunting period. Doesnt look like i will get back to Tennessee with enough time to hunt this season, so the lesson learned is to plan a bit better for next season. There is a (slim) chance I will get out to TN around Thanksgiving and make late rifle season, but thats very slim at this point.

[DFBrews]

Sucks man I have not been able to hunt in a while either. I have had good luck with the ttsx out of my pistol as far as accuracy using h110. Have not ran them across a chrono yet.

[20X11]

My ballistics program shows 125gr(ballistic coefficient of .300) .308 (300blk) projectiles with a muzzle velocity of 2300fps having 1158ft/lbs of retained energy at 100 yds, which would make it a legal hunting round in Colorado. As I have said in other posts, I plan to hunt whitetail in NE this year with this round, but would have no qualms using in the right situation in Colorado. Getting within 150-200 yards of an antelope would be a challenge in many areas, but thats why God blessed us with a long range round like the 7mm mag.

[20X11]

To the OP...
A lot of load data can be found here...
http://www.300blktalk.com/forum/viewforum.php?f=141
They are starting to have a separate thread for each powder.
Enjoy!

[jerrymrc]

Testing tomorrow. Some 125 SP, 110 Vmax and some X39 124 FMJ. the X39 measure .109.5 and chambered just fine. trying a few diff charges and taking the P35 with me. [Flower] http://i884.photobucket.com/albums/ac44/jerrymrc/toys/Picture563Medium.jpg

[Hoser]

Testing tomorrow.

That is some good looking brass.

[DFBrews]

my 110 grain barnes black tip bullets will be here tomorrow. .75 cents a bullet holy damn

[DSB OUTDOORS]

I did work up a nice load for the 200g Sierra MK, 12.5 g V V N 110, shot through, completely through a 15" stump at 40 yards. Hear a richochet on the 3rd round from a rock behind. I need to expand my range here in the hills a bit and test it some more.

[jerrymrc]

That is some good looking brass.

Never know what you will find in a parking lot. [Beer]

Well some results are in and to be honest I need to re-think some of these. Had an issue with a bolt but fixed that. Had some very good groups out of all the bullets including the .309 124 gr.

The most consistent across the P35 was the .309 bullets and I think I know why. My 19gr H110 load was both fast and accurate with 4 touching and a 5th 1/2" away at 75 yards. The primers also showed that it was pretty warm but nothing alarming. The cases are the same OAL that I started with.

Cases. LC converted by Hoser 1.348, H110, CCI #41 Light FC die.

125gr FMJ SP unknown MFG Bought these years ago as .310 bullets but are .308

16.5Gr= 1994, 2079, 2074, 2018, 2040
17Gr= 2097, 2136, 2122, 2039, 2102
17.5Gr= 2174, 2155, 2202, 2171, 2155

110Gr Vmax

18.5Gr= 2142, 2190, 2210, 2216, 2158
19Gr= 2359, 2376, 2373, 2394, 2368

124Gr Golden west FMJ .309.5

17Gr= 2022, 2041, 2095, 2038, 2076
18Gr= 2196, 2207, 2201, 2205, 2202

May try some STD primers I may stick with the 41's. What I am seeing is that using the 41's gives me more room bullet wise in the case. Compared to MFG data I am at or above FPS using a grain less powder and that is about right.

The one thing I did take away is that this cartridge is going to be very sensitive to small changes in the charge. Any thoughts?

[20X11]

Here is my Lil Gun Ladder on 125gr Nosler Ballistic tips....
Lil Gun 17.4 gr
2129
2171
2159
2171
2178


Lil Gun 17.7 gr
2171
2222
2218
2182
2207 Bolt not held Open

Lil Gun 18.0gr
2189
2222
2207
2222
2263 Bolt not held Open

Lil Gun 18.2 gr
2244
2259
2244
2248
2283


Lil Gun 18.5 gr
2233
2271
2279
2225
2279


Lil Gun 18.8 gr
2287
2331
2302
2279
2310

CCI 400 Primers - Once fired Remington 300blk brass
Fired through a 16"CMMG barrel - Carbine length gas system.
Notice how velocity Plateaus at a couple of these charge weights.
No Pressure signs all the way up the Ladder though.
I think LilGun may be the ideal powder for supersonics in 300blk.

[20X11]

Here is my Ladder on H110 under Nosler 125 gr Ballistic tips..
Note- 17.8 gr MAXIMUM according to Hodgdon..
H110 17.2 gr
2088 FTF
2099 FTF
2106 FTF
2103 FTF
2093 Bolt Not Held Open

H110 17.5 gr
2080
2129
2157
2147
2160 Bolt Not Held Open

H110 17.8 gr
2143 FTF
2196
2175
2196
2203

Same primers,barrel, brass, etc as previous post

[20X11]

I have started to test Vihta Vouri N110...will post data when I finish...promising preliminary results...very accurate and consistent so far, just dont know if I'll be able to get enough powder in the case to get the velocity I am after.

[jerrymrc]

I have started to test Vihta Vouri N110...will post data when I finish...promising preliminary results...very accurate and consistent so far, just dont know if I'll be able to get enough powder in the case to get the velocity I am after.

That was another I may try. I had a couple of the loads lock the bolt back but even though I did not write it down I do remember that one of the slower loads did it and some did not. The N110 may work well with the hotter primer. Thanks for your input. BTW mine is a PSA 16" carbine gas upper. [Flower]

[Sergeant212]

After reading this thread I checked the math and registered to the site just so I could post this.


Ballistic Coefficient
0.289
Velocity (ft/s)
2350
Weight (grains)
110

[20X11]

Yep...my math is good

[ssgenuine]

Have you worked up a load for the 110gr black tips yet? I was only able to get lil gun when I got my reloader, good thing... Bought some Nosler ballistic tip (green tip) 125gr but haven't figured out a load for them. So far I tried up to 18.6 gr lil gun with them and only managed to get a 3" group.

16" barrel on both guns, same groupings so far. Even the supersonics are quiet through the suppressors. I sure do like this caliber. Dragging around an AR10 through the woods in the Texas heat chasing hogs sure got tiresome. The Military boys who lug those around don't get near enough recognition (not just for what they do, but also for all the shit they have to carry).

[mechtechbob]

Running 125 nosler Ballistic Tips right at 2000fps out of a 16" Danniels Defense, 5 hogs killed, closest about 35 yards, the farthest 115 yards with range finder, all but one went down at the shot and the last one went less than 50 yards and the exit holes were impressive. Also found that lil gun gives better velocity than H110 or 1680, at least in my gun, Hodgdon shows way less pressure with lil gun at near the same velocities especially with 100 gr bullets