300 BLK QL request

[Wincheringen]

If anybody would like to run a QL for me I would appreciate it.

I'm looking to make some subsonic 300BLK. I've got 175 grain Custom Competitions and 180 grain Ballistic Tips. Looking at the existing data for heavier bullets and what I have on hand, I would be using Accurate 5744 and Alliant 300MP. I could also get some IMR 4227. I'm running an 8" barrel and I'll be using Nosler brass. I want to be under 1100 FPS, and preferably right at 1050 FPS. Thanks!

 

[DrMike]

Cartridge : .300 AAC Blackout (SAAMI)
Bullet : .308, 175, Nosler CC HPBT J4 53952
Useable Case Capaci: 19.012 grain H2O = 1.234 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 8.0 inch = 203.2 mm
Powder : Accurate 5744

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 76 12.80 1287 643 30470 7525 83.4 0.848
-18.0 78 13.12 1318 675 32325 7790 84.5 0.826
-16.0 80 13.44 1349 707 34278 8053 85.6 0.805
-14.0 82 13.76 1381 741 36334 8315 86.7 0.784
-12.0 84 14.08 1412 775 38499 8574 87.7 0.762
-10.0 86 14.40 1443 810 40781 8831 88.7 0.742
-08.0 88 14.72 1475 845 43185 9085 89.7 0.721
-06.0 90 15.04 1506 882 45720 9336 90.6 0.701
-04.0 92 15.36 1538 919 48394 9582 91.5 0.682 ! Near Maximum !
-02.0 94 15.68 1569 957 51217 9824 92.3 0.664 ! Near Maximum !
+00.0 95 16.00 1601 996 54197 10061 93.1 0.646 ! Near Maximum !
+02.0 97 16.32 1632 1035 57347 10293 93.9 0.629 !DANGEROUS LOAD-DO NOT USE!
+04.0 99 16.64 1664 1076 60677 10518 94.6 0.613 !DANGEROUS LOAD-DO NOT USE!
+06.0 101 16.96 1696 1117 64202 10737 95.3 0.597 !DANGEROUS LOAD-DO NOT USE!
+08.0 103 17.28 1727 1159 67936 10950 95.9 0.582 !DANGEROUS LOAD-DO NOT USE!
+10.0 105 17.60 1759 1202 71894 11154 96.5 0.567 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 95 16.00 1676 1092 62364 10341 97.7 0.606 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 95 16.00 1509 885 46215 9463 86.1 0.697

Cartridge : .300 AAC Blackout (SAAMI)
Bullet : .308, 175, Nosler CC HPBT J4 53952
Useable Case Capaci: 19.012 grain H2O = 1.234 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 8.0 inch = 203.2 mm
Powder : IMR 4227

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 83 13.28 1270 626 29118 7217 84.9 0.852
-18.0 85 13.61 1300 657 30917 7469 86.0 0.831
-16.0 87 13.94 1331 689 32824 7720 87.2 0.810
-14.0 89 14.28 1362 721 34848 7967 88.3 0.790
-12.0 91 14.61 1394 755 36995 8211 89.3 0.771
-10.0 93 14.94 1425 789 39276 8451 90.4 0.749
-08.0 95 15.27 1456 824 41699 8687 91.3 0.728
-06.0 97 15.60 1488 860 44275 8917 92.3 0.708
-04.0 99 15.94 1519 897 47017 9141 93.1 0.688 ! Near Maximum !
-02.0 101 16.27 1551 935 49933 9359 94.0 0.669 ! Near Maximum !
+00.0 104 16.60 1583 974 53046 9570 94.7 0.650 ! Near Maximum !
+02.0 106 16.93 1615 1013 56349 9773 95.5 0.633 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 17.26 1647 1054 59861 9968 96.2 0.615 !DANGEROUS LOAD-DO NOT USE!
+06.0 110 17.60 1679 1095 63613 10154 96.8 0.599 !DANGEROUS LOAD-DO NOT USE!
+08.0 112 17.93 1711 1138 67626 10329 97.4 0.583 !DANGEROUS LOAD-DO NOT USE!
+10.0 114 18.26 1744 1181 71926 10494 97.9 0.567 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 104 16.60 1659 1070 62080 9714 98.8 0.607 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 16.60 1488 860 44254 9052 87.6 0.705

 

[DrMike]

Cartridge : .300 AAC Blackout (SAAMI)
Bullet : .308, 180, Nosler BalTip 30180
Useable Case Capaci: 16.592 grain H2O = 1.077 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 8.0 inch = 203.2 mm
Powder : IMR 4227

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 86 12.00 1212 588 28866 6309 83.7 0.876
-18.0 88 12.30 1242 617 30682 6531 84.9 0.854
-16.0 90 12.60 1272 647 32614 6751 86.0 0.832
-14.0 92 12.90 1302 677 34668 6969 87.1 0.811
-12.0 94 13.20 1332 709 36854 7184 88.2 0.791
-10.0 96 13.50 1362 742 39182 7396 89.3 0.769
-08.0 99 13.80 1392 775 41664 7603 90.3 0.747
-06.0 101 14.10 1423 809 44311 7806 91.3 0.726
-04.0 103 14.40 1454 845 47138 8004 92.2 0.705 ! Near Maximum !
-02.0 105 14.70 1484 881 50158 8197 93.1 0.685 ! Near Maximum !
+00.0 107 15.00 1515 918 53392 8382 93.9 0.666 ! Near Maximum !
+02.0 109 15.30 1546 956 56857 8562 94.7 0.648 !DANGEROUS LOAD-DO NOT USE!
+04.0 111 15.60 1578 995 60570 8733 95.4 0.630 !DANGEROUS LOAD-DO NOT USE!
+06.0 114 15.90 1609 1035 64564 8896 96.1 0.612 !DANGEROUS LOAD-DO NOT USE!
+08.0 116 16.20 1640 1075 68865 9051 96.7 0.596 !DANGEROUS LOAD-DO NOT USE!
+10.0 118 16.50 1672 1117 73489 9196 97.3 0.579 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 107 15.00 1590 1011 62806 8539 98.4 0.622 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 107 15.00 1422 808 44516 7900 86.4 0.722

Cartridge : .300 AAC Blackout (SAAMI)
Bullet : .308, 180, Nosler BalTip 30180
Useable Case Capaci: 16.592 grain H2O = 1.077 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length : 8.0 inch = 203.2 mm
Powder : Accurate 5744

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 78 11.44 1218 593 29637 6496 81.8 0.879
-18.0 80 11.73 1248 622 31459 6726 83.0 0.856
-16.0 82 12.01 1278 652 33381 6956 84.1 0.834
-14.0 84 12.30 1307 683 35407 7184 85.2 0.813
-12.0 86 12.58 1337 715 37546 7411 86.2 0.792
-10.0 88 12.87 1367 747 39803 7636 87.3 0.770
-08.0 90 13.16 1397 780 42187 7858 88.3 0.749
-06.0 92 13.44 1427 814 44706 8078 89.2 0.728
-04.0 94 13.73 1457 849 47368 8294 90.1 0.708 ! Near Maximum !
-02.0 96 14.01 1487 884 50184 8507 91.0 0.689 ! Near Maximum !
+00.0 98 14.30 1518 920 53165 8716 91.9 0.671 ! Near Maximum !
+02.0 100 14.59 1548 957 56322 8920 92.7 0.653 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 14.87 1578 995 59670 9119 93.4 0.636 !DANGEROUS LOAD-DO NOT USE!
+06.0 104 15.16 1608 1034 63222 9313 94.2 0.619 !DANGEROUS LOAD-DO NOT USE!
+08.0 106 15.44 1639 1073 66995 9502 94.8 0.603 !DANGEROUS LOAD-DO NOT USE!
+10.0 108 15.73 1669 1114 71007 9683 95.5 0.588 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 98 14.30 1591 1012 61319 9004 96.9 0.629 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 14.30 1428 815 45240 8159 84.5 0.724

 

[Wincheringen]

Looks like I might have to venture into uncharted territory and try a few even lower than QL will go.

 

[Wyo7200]

I'm using 208gr amax and have problems staying below 1200 fps and having enough gas to cycle the action with a can attached. I settled on 10.3 and have a temp range of ~55 to 70 degrees. Its a hit or miss if it holds the bolt open on the last round. It also goes supersonic when it gets below 50.

This is my QL for comparison. If its a semi-auto, I think you'll have cycling problems if you get below 30k psi. To get down to the fps you're after, you will be around 20k psi. It may not even have enough juice to eject the case.

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 208, Hornady A-MAX 30712
Useable Case Capaci: 15.368 grain H2O = 0.998 cm³
Cartridge O.A.L. L6: 2.170 inch = 55.12 mm
Barrel Length      : 9.0 inch = 228.6 mm
Powder             : Accurate 5744

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   65     8.80    982     445   20451   4197     78.3    1.214
-18.0   67     9.02   1005     466   21562   4348     79.4    1.185
-16.0   68     9.24   1028     488   22723   4499     80.5    1.157
-14.0   70     9.46   1051     510   23936   4650     81.5    1.130
-12.0   71     9.68   1074     533   25202   4802     82.6    1.104
-10.0   73     9.90   1097     556   26525   4952     83.6    1.080
-08.0   75    10.12   1120     579   27906   5103     84.5    1.055
-06.0   76    10.34   1143     603   29348   5252     85.5    1.032
-04.0   78    10.56   1165     627   30855   5401     86.4    1.010
-02.0   80    10.78   1188     652   32429   5548     87.3    0.988
+00.0   81    11.00   1211     677   34073   5695     88.2    0.967
+02.0   83    11.22   1234     703   35791   5840     89.0    0.946
+04.0   84    11.44   1257     729   37587   5983     89.8    0.926
+06.0   86    11.66   1280     756   39464   6124     90.6    0.905
+08.0   88    11.88   1302     783   41427   6264     91.3    0.884
+10.0   89    12.10   1325     811   43480   6401     92.0    0.865

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     81    11.00   1275     751   39222   5973     94.2    0.909
Data for burning rate decreased by 10% relative to nominal value:
-Ba     81    11.00   1136     596   29114   5261     80.2    1.035

Here is one ran with 175gr for you:

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 175, Nosler CC HPBT J4 53952
Useable Case Capaci: 19.012 grain H2O = 1.234 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 9.0 inch = 228.6 mm
Powder             : Accurate 5744

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   49     8.24    873     296   12245   3457     65.4    1.394
-18.0   50     8.45    893     310   12812   3591     66.4    1.363
-16.0   52     8.65    914     325   13399   3726     67.4    1.333
-14.0   53     8.86    935     339   14007   3863     68.4    1.305
-12.0   54     9.06    955     355   14637   4000     69.4    1.277
-10.0   55     9.27    976     370   15288   4139     70.4    1.251
-08.0   57     9.48    997     386   15962   4279     71.4    1.226
-06.0   58     9.68   1017     402   16660   4421     72.4    1.201
-04.0   59     9.89   1038     418   17382   4563     73.3    1.178
-02.0   60    10.09   1058     435   18128   4706     74.2    1.155
+00.0   61    10.30   1079     452   18900   4849     75.2    1.133
+02.0   63    10.51   1099     470   19699   4994     76.1    1.112
+04.0   64    10.71   1120     487   20524   5139     77.0    1.091
+06.0   65    10.92   1140     505   21377   5284     77.8    1.071
+08.0   66    11.12   1161     524   22259   5429     78.7    1.052
+10.0   68    11.33   1181     542   23171   5575     79.5    1.033

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     61    10.30   1147     511   21618   5283     82.7    1.069
Data for burning rate decreased by 10% relative to nominal value:
-Ba     61    10.30   1003     391   16330   4336     66.6    1.207

 

[Wincheringen]

I wonder if the faster pistol powders would work better. I have Red Dot, Green Dot, Blue Dot, HS6, Unique, Longshot, & Trailboss.

 

[Wyo7200]

Trailboss will probably be your best bet. I dont have access to the QL right now, but I will check back tonight and see if anyone else has ran it for you.

 

[Wincheringen]

It appears through some more research that IMR 4198 might work as well. There was a thread on 300blktalk about 10.8 grains of IMR 4198 with a Hornady 178 that was subsonic and cycled 100%.

 

[Wyo7200]

Cool. Here's some info:

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 175, Nosler CC HPBT J4 53952
Useable Case Capaci: 19.006 grain H2O = 1.234 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 8.0 inch = 203.2 mm
Powder             : IMR 4198

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   66    10.35    933     339   13818   4263     63.3    1.192
-09.0   67    10.47    942     345   14093   4341     63.7    1.182
-08.0   67    10.58    950     351   14373   4420     64.2    1.171
-07.0   68    10.70    958     357   14659   4500     64.6    1.161
-06.0   69    10.81    967     363   14950   4581     65.1    1.150
-05.0   70    10.93    975     370   15247   4662     65.5    1.140
-04.0   70    11.04    984     376   15551   4743     66.0    1.130
-03.0   71    11.16    993     383   15859   4825     66.4    1.120
-02.0   72    11.27   1002     390   16173   4908     66.9    1.110
-01.0   72    11.39   1010     397   16494   4991     67.4    1.100
+00.0   73    11.50   1019     404   16819   5075     67.8    1.090
+01.0   74    11.62   1028     411   17151   5159     68.3    1.081
+02.0   75    11.73   1037     418   17490   5244     68.7    1.071
+03.0   75    11.85   1046     425   17836   5330     69.2    1.062
+04.0   76    11.96   1055     433   18190   5415     69.7    1.053
+05.0   77    12.08   1064     440   18549   5501     70.1    1.043

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     73    11.50   1052     430   18055   5407     72.3    1.028
Data for burning rate decreased by 5% relative to nominal value:
-Ba     73    11.50    986     378   15633   4725     63.3    1.123

Trailboss: limited by case volume, but well under the 1050 fps

Cartridge          : .300 AAC Blackout (SAAMI)
Bullet             : .308, 175, Nosler CC HPBT J4 53952
Useable Case Capaci: 19.006 grain H2O = 1.234 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 8.0 inch = 203.2 mm
Powder             : IMR TrailBoss

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   94     5.53    888     306   23623   2381    100.0    1.052
-09.0   95     5.59    893     310   24025   2405    100.0    1.044
-08.0   96     5.65    899     314   24431   2429    100.0    1.037
-07.0   97     5.71    904     318   24840   2454    100.0    1.030
-06.0   98     5.77    910     322   25252   2478    100.0    1.023
-05.0   99     5.83    915     326   25667   2502    100.0    1.016
-04.0  100     5.89    921     329   26084   2527    100.0    1.009
-03.0  101     5.96    926     333   26505   2551    100.0    1.003
-02.0  102     6.02    931     337   26929   2575    100.0    0.996
-01.0  103     6.08    937     341   27356   2599    100.0    0.990
+00.0  104     6.14    942     345   27787   2623    100.0    0.984
+01.0  105     6.20    947     349   28220   2647    100.0    0.977
+02.0  106     6.26    952     352   28657   2671    100.0    0.971
+03.0  107     6.32    958     356   29096   2695    100.0    0.965
+04.0  108     6.39    963     360   29539   2719    100.0    0.959
+05.0  109     6.45    968     364   29985   2743    100.0    0.954

 

[Wincheringen]

I like both of those. I'm going to try them all. I've had my F1 approved for a while but just got around to getting all the parts to build an upper.

 

[Thebear_78]

I picked this up at a recent gun show. 9” 300 BLK upper on a pistol lower with sigtac brace. I am working on getting a trust set up and will SBR this pistol as soon as I get approved. Its a pretty neat little cartridge but I have been having a hard time getting it to cycle and lock back with subsonic loads. I think one of these would make a dandy home defense setup.

Sent from my iPhone using Tapatalk

 

[russ808]

Wincheringen, be mindful when you use the trail boss. When you compress the load we couldnt get consistent accuracy. Yet, when we went lower, you have to be very careful, as we had a round get stuck in the barrel. That was bad juju as the barrel was trashed. We use 220 grain nosler bthp.with 10.3 to 10.5 grains of aa-1680. We zeroed at 50 yards and it is 4" low at 100. We are using 16" barrels with 1-7 twist. Hope this helps.
russ

 

[Wyo7200]

Do you know how far down the barrel the squib went with the Trail Boss?

 

[russ808]

My buddy said the bullet was about half way in.
Russ

 

[Woodycreek]

Anybody tried reloads using 240 grainers in an AR?

 

[roadtoad]

sub load using blem nosler 190 cc 10.2 gr imr 4227, CCI 500 @ 980 fps out of a 16" barrel with pistol gas.