300 blackout quickload

bigd7378 · May 22, 2013

Just purchased a new rem 700 sps in 300 blackout with 16 inch 5-r 1-7 twist barrel. Wanting to start loading 125 ballistic tips or maybe the 125 accubomb for it. AccuBond might be to stought for the blackout. Powders I have on hand are alliant 300mp, reloader 7, H110 and lil gun. Looking for a good little deer rifle out of it. Kinda getting tired of the 300 wsm and 300 rum tearing up my shoulder. Any help would be appreciated. Thanks

DrMike · May 22, 2013

I note that Nosler No. 7 Guide lists a maximum charge of 18.0 grains of H110 and 18.0 grains of Lil' Gun. It also gives a maximum charge of 17.5 grains of W296 and 18.0 grains of IMR4227. The start charge for each of these loads is 2.0 grains less. All these are with the 125 grain BT.

bigd7378 · May 22, 2013

Thanks DrMike, I have the nosler #7. Just can't seem to find power pro 300mr or reloader 7 loads anywhere.

DrMike · May 22, 2013

Code:

Cartridge          : .300 AAC Blackout
Bullet             : .308, 125, Nosler BalTip 30125
Useable Case Capaci: 22.269 grain H2O = 1.446 cm³
Cartridge O.A.L. L6: 2.260 inch = 57.40 mm
Barrel Length      : 20.0 inch = 508.0 mm
Powder             : Alliant Reloder-7

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   91    18.00   1851     951   25232   3200     83.7    1.364
-18.0   93    18.45   1897     999   26974   3305     85.0    1.328
-16.0   95    18.90   1943    1048   28846   3408     86.3    1.293
-14.0   97    19.35   1990    1099   30873   3509     87.5    1.258
-12.0  100    19.80   2036    1151   33035   3607     88.6    1.225
-10.0  102    20.25   2083    1204   35344   3702     89.7    1.193
-08.0  104    20.70   2129    1258   37822   3794     90.8    1.161
-06.0  106    21.15   2176    1314   40498   3882     91.8    1.127
-04.0  109    21.60   2223    1372   43392   3966     92.8    1.095  ! Near Maximum !
-02.0  111    22.05   2270    1430   46525   4046     93.7    1.064  ! Near Maximum !
+00.0  113    22.50   2317    1490   49921   4121     94.5    1.034  ! Near Maximum !
+02.0  116    22.95   2364    1552   53611   4191     95.3    1.005  !DANGEROUS LOAD-DO NOT USE!
+04.0  118    23.40   2412    1614   57625   4255     96.1    0.977  !DANGEROUS LOAD-DO NOT USE!
+06.0  120    23.85   2459    1678   62004   4314     96.7    0.950  !DANGEROUS LOAD-DO NOT USE!
+08.0  122    24.30   2506    1744   66789   4367     97.3    0.923  !DANGEROUS LOAD-DO NOT USE!
+10.0  125    24.75   2554    1811   72035   4413     97.9    0.898  !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    113    22.50   2438    1649   60494   4131     98.9    0.961  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    113    22.50   2163    1298   39957   3923     86.8    1.131

bigd7378 · May 22, 2013

Thanks DrMike, reloader 7 looks promising. Do you have it for power pro 300mp also? Need to start loading this weekend

martineta · May 23, 2013

I have been loading 18.5 grn H110 with 125 Nos BT's for 13 yrs in a 300 Whisper SSK made Thompson Center Encore single shot and now use the same load for a 300 Blackout in my Noveske AR. Deer killer that gives me 2200 fps out of 16 inch barrel. Now,,, if I could only find Nos 125 BT's anywhere online or at a store I would be the happiest man in the Universe.