300Wm & 180nbt QL Help Please

Aussie Wanderer · Mar 16, 2023

Hi Guys,

Just finished a range session trying to get my 300wm to a place I am happy with. I was playing with the Sierra 175 Tipped Matchking and settled on 77 grains of H4831/AR2213 as we know it. 26 inch barrel, and was delivering an honest 3/4 inch group. (Actually be interested in QL data for that too). This was going to be my bench mark as to whether I would persist with the 300 or send it down the road, I just couldn't get it to shoot with the 178 eldm. about an inch was all it could do.

Just before I walked out the door, I thought, load 5 180 grain Nosler BT's behind 70 grains of H4350/AR2209 and see what that does. Well that out shot the sierra matchking, not by much, but the group was more round and looked better if that makes sense. (The one to the left was a flinch as the guy beside me shot just before the trigger broke on my rifle) Now I am wondering whether I should work around this load and see what it will do or whether that is great and just settle on it. The barrel was super hot at the end of string too as I wanted to pack up before the cease fire. I suspect there is a lot of promise with this projectile in this rifle.

Life a reloader right, always searching ;-) So if someone could please indulge a fellow shooter with some QL data, that would be great.

Thanks in advance.

DrMike · Mar 16, 2023

Code:

Cartridge          : .300 Win. Mag.(SAAMI)
Bullet             : .308, 175, Sierra TMK 7775
Useable Case Capaci: 80.336 grain H2O = 5.216 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : ADI AR 2213

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   93    69.30   2790    3024   44378  11773     94.2    1.313
-09.0   94    70.07   2823    3097   45921  11922     94.8    1.292
-08.0   95    70.84   2856    3171   47520  12066     95.3    1.271
-07.0   96    71.61   2890    3245   49179  12205     95.8    1.251
-06.0   97    72.38   2923    3321   50902  12339     96.3    1.231
-05.0   98    73.15   2957    3398   52691  12469     96.7    1.211
-04.0   99    73.92   2991    3475   54549  12593     97.1    1.192  ! Near Maximum !
-03.0  100    74.69   3024    3554   56479  12712     97.5    1.173  ! Near Maximum !
-02.0  101    75.46   3058    3633   58485  12824     97.9    1.154  ! Near Maximum !
-01.0  102    76.23   3091    3713   60570  12932     98.2    1.136  ! Near Maximum !
+00.0  103    77.00   3125    3795   62739  13033     98.5    1.118  ! Near Maximum !
+01.0  104    77.77   3158    3877   64994  13127     98.8    1.100  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    78.54   3192    3959   67343  13215     99.1    1.082  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    79.31   3226    4043   69789  13297     99.3    1.065  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    80.08   3259    4127   72336  13372     99.5    1.048  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    80.85   3293    4213   74992  13439     99.6    1.032  !DANGEROUS LOAD-DO NOT USE!

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    103    77.00   3208    3998   69098  12953     99.8    1.073  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    103    77.00   3028    3563   56770  12915     96.0    1.168  ! Near Maximum !

Code:

Cartridge          : .300 Win. Mag.(SAAMI)
Bullet             : .308, 180, Nosler BalTip 30180
Useable Case Capaci: 80.219 grain H2O = 5.209 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : ADI AR 2209

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   86    63.00   2638    2782   40381  10838     94.8    1.395
-09.0   87    63.70   2668    2844   41653  10971     95.3    1.374
-08.0   88    64.40   2697    2906   42966  11101     95.7    1.354
-07.0   89    65.10   2726    2969   44322  11228     96.2    1.334
-06.0   89    65.80   2755    3033   45717  11351     96.6    1.315
-05.0   90    66.50   2784    3097   47165  11471     97.0    1.296
-04.0   91    67.20   2813    3162   48657  11587     97.3    1.277
-03.0   92    67.90   2842    3227   50197  11699     97.7    1.259
-02.0   93    68.60   2871    3294   51787  11807     98.0    1.241
-01.0   94    69.30   2899    3360   53431  11911     98.3    1.223
+00.0   95    70.00   2928    3427   55129  12010     98.5    1.206  ! Near Maximum !
+01.0   96    70.70   2957    3495   56883  12105     98.8    1.189  ! Near Maximum !
+02.0   97    71.40   2986    3564   58697  12196     99.0    1.172  ! Near Maximum !
+03.0   98    72.10   3015    3632   60573  12282     99.2    1.155  ! Near Maximum !
+04.0   99    72.80   3043    3702   62513  12364     99.4    1.139  ! Near Maximum !
+05.0  100    73.50   3072    3772   64518  12440     99.6    1.123  !DANGEROUS LOAD-DO NOT USE!

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     95    70.00   3001    3599   60413  11958     99.8    1.160  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba     95    70.00   2844    3233   50077  11903     96.2    1.258

You have some room with the AR2209 if you want to reach for a bit more velocity. It is possible that it will tighten your group as well.