300 blackout (BLK)

[TonyM]

Anyone familiar with this cartridge? I just ordered an Upper for my AR-15 in this caliber, and I'm having a hard time finding much load data for it. It is relatively new, but there is factory ammo out there for it fairly available...

I've read that you can pretty much use any 300 Whisper load data... but again, most of the data I find for that is for the TC, not an autoloader.

There is a fair amount of subsonic data out there (As this cartridge seems to shine in that config), but I'm looking for supersonic.

Of the VERY few loads I've seen out there that deal with supersonic charges, are H110, and N110. Both of these seem to be pretty close to Lil Gun... and because I have a plethora of that powder, I'd like to use it if possible. I've also got a good amount of Varget, which I would also like to use...

Any ideas?

Thanks... :drinks:

[Idaho Sharpshooter]

Hornady data can be found on their website. Jacketed, up to 240gr SMK's.

Rich

[dk17hmr]

Here is some data for the whisper, the top end stuff might be to hot so work up http://listmequick.com/300/Sierra300whisper.pdf

I was blowing primers when I got to the listed max in my AR15.

[TonyM]

Hornady data can be found on their website. Jacketed, up to 240gr SMK's.

Rich

I didn't see anything on Hornady's website. Closing thing it looked like they had was for a 300 savage... which is not very close.



Here is some data for the whisper, the top end stuff might be to hot so work up http://listmequick.com/300/Sierra300whisper.pdf

I was blowing primers when I got to the listed max in my AR15.

The test gun for that load data was a TC with a 1/10 twist. Mine (And almost all other 300BLK barrels are 1/8. Also, I noticed the fastest load on that page was right at 2100FPS. On the AAC 300BLK website (http://300aacblackout.com/), they show velocities of 2300+ for a 123gr bullet.

Also, neither source shows pressure data....

Thanks for looking though... anyone else?

[BerdanIII]

Have you tried the Silencer Talk website? They have a board specifically for the .300 Blackout.

[dk17hmr]

....... The test gun for that load data was a TC with a 1/10 twist. Mine (And almost all other 300BLK barrels are 1/8. Also, I noticed the fastest load on that page was right at 2100FPS. On the AAC 300BLK website (http://300aacblackout.com/), they show velocities of 2300+ for a 123gr bullet.

Also, neither source shows pressure data....

Thanks for looking though... anyone else?

My whisper is a 1:8 twist also, that link should give you a place to start as it did me. For velocities you have to remember those loads were worked up in a 10" gun, with top loads of H110/w296 with a 125gr Nosler Ballistic tip I am right in at 2250 out of my 16". If that doesnt help Im not sure what your are looking for. I havent seen any published data for lil'gun, H110/w296 run my ar15 perfectly with everything from 110gr-210gr, AA9 works well with lighter bullets for me also.

[L1A1Rocker]

Here ya go:

The blackout in general:
http://www.silencertalk.com/forum/viewforum.php?f=128

Load info:
http://www.silencertalk.com/forum/viewtopic.php?f=128&t=68693

[TonyM]

My whisper is a 1:8 twist also, that link should give you a place to start as it did me. For velocities you have to remember those loads were worked up in a 10" gun, with top loads of H110/w296 with a 125gr Nosler Ballistic tip I am right in at 2250 out of my 16". If that doesnt help Im not sure what your are looking for. I havent seen any published data for lil'gun, H110/w296 run my ar15 perfectly with everything from 110gr-210gr, AA9 works well with lighter bullets for me also.

Thats good info. Thanks.


Here ya go:

The blackout in general:
http://www.silencertalk.com/forum/viewforum.php?f=128

Load info:
http://www.silencertalk.com/forum/viewtopic.php?f=128&t=68693

The subsonic guys sure seem to like this round... I hope it does as well at the higher velocities.

Thanks for the input guys.

[andremajic]

I'm using 16.5 grains h110 in resized LC Brass, trimmed to OAL of 1.360" with 145 grain fmj spbt bullets (bulk prvi partizan) OAL varies because the bullets OAL varies and the bullet seating dies seat by the ogive, weight is same though. The dies are set to maximum seating depth, for ease of loading 30 round mags. No pressure signs. Accuracy is pretty decent. I'd say the rifle can shoot better than me.

Primers have been federal match small rifle and CCI no. 400. Haven't noticed a difference in primers, probably because of the reduced case capacity.

Going down to 10-11 grains produces subsonic speeds, but the brass stovepipes and doesn't fully eject. Need to use heavier bullets for fully cycling subsonic loads. Recoil is comparable to .223 and is very pleasant to shoot.

Firing from a 16.5" barrel with 1/10 twist. FPS average 1980 FPS with the best accuracy. AR barrel reamed with PTG 300 AAC BLK Reamer to minimum headspace.

Using same brass and primers tried up to 16 grains reloder 7 with all the same lengths and measurements. Great grouping, but the powder left more residue and gunk. (Ran out of Reloder 7 and switched to H110 which seems a lot cleaner.)

YMMV Good luck
Andy.

[TonyM]

Welp, I cancelled my order for this upper. The builder was waiting on some parts, so he hadn't even started the build yet, thankfully.

It looks like this round is pretty unimpressive for the most part at supersonic speeds, especially at longer distances. Subsonically, however, it seems to be the cats meow.. (Witch doesn't do me any good).

A wild hair was pulled and I ordered (Well, put the deposit on anyway) a 338 lapua upper instead.. should have it in 4-6 weeks hopefully.


Thanks again for everyones input on this, hopefully it will prove useful to those who were in the same boat I was before I changed course... :-?

[Jbiker]

I started reloading for the 300ac and found one blog that did have a number of load's ..some were using lilgun...goggle the 300aac blackout and it'll take you there. If your going to load and have a chrono..find a load and work it. the one's I just put together are as follows...220 sie hpbt ...h110 10.5 hrs and 9.9 grains coal was 2.300 plus/minus .005 ...I'll let you know after the next trip to the range. got to go to New Hampshire to the son's gun store to shoot the loads, Mass is really anal about long guns with can's on them !LOL

[xacex]

I started reloading for the 300ac and found one blog that did have a number of load's ..some were using lilgun...goggle the 300aac blackout and it'll take you there. If your going to load and have a chrono..find a load and work it. the one's I just put together are as follows...220 sie hpbt ...h110 10.5 hrs and 9.9 grains coal was 2.300 plus/minus .005 ...I'll let you know after the next trip to the range. got to go to New Hampshire to the son's gun store to shoot the loads, Mass is really anal about long guns with can's on them !LOL

Not a good idea. H110 gets unpredictable when downloaded and your SD will start going all over the place. Stay with the slow powders for subs. AA1680,H4895,H4195,and IMR 4227.
I do like Lil Gun more than H110 for supers. It has saved my brass from annihilation after two reloads with H110.