POP - WSM QL Request

[sithlord6512]

Hi POP,

Hoping you will help me out. What is the the Quickload Max for a .300 WSM + IMR4831 + 180 g TTSX combination.

Using data from various sources (but none for Barnes Bullets), I was going to use 67.6 grains as my Max.

However, I am somewhat uncomfortable, as the IMR4831 Data that I have checked is so varied for 180 grainers - they range of 66.3 grains to 70 grains for the max load depending on the bullet and the source of data. While I have read that such ranges/variations our common, this is the first time I have seen it.

Thanks in advance.

 

[DrMike]

Sithlord,


Cartridge : .300 WSM (CIP)
Bullet : .308, 180, Barnes 'TTSX'BT 30879
Useable Case Capaci: 68.013 grain H2O = 4.416 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 4831

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 84 50.40 2389 2281 33231 8320 95.9 1.548
-18.0 86 51.66 2445 2390 35411 8532 96.8 1.508
-16.0 88 52.92 2501 2500 37735 8732 97.5 1.468
-14.0 90 54.18 2557 2613 40211 8919 98.2 1.430
-12.0 92 55.44 2612 2728 42849 9092 98.7 1.393
-10.0 94 56.70 2668 2844 45661 9249 99.2 1.354
-08.0 97 57.96 2722 2962 48658 9391 99.6 1.315
-06.0 99 59.22 2777 3081 51854 9517 99.8 1.277
-04.0 101 60.48 2831 3202 55264 9625 100.0 1.240 ! Near Maximum !
-02.0 103 61.74 2884 3324 58904 9716 100.0 1.205 ! Near Maximum !
+00.0 105 63.00 2937 3448 62791 9796 100.0 1.171 ! Near Maximum !
+02.0 107 64.26 2989 3572 66947 9874 100.0 1.138 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 65.52 3041 3697 71395 9949 100.0 1.107 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 66.78 3093 3824 76158 10020 100.0 1.076 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 68.04 3144 3952 81266 10088 100.0 1.047 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 69.30 3195 4081 86751 10152 100.0 1.018 !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 105 63.00 3038 3688 75025 9409 100.0 1.090 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 105 63.00 2784 3098 50786 10061 98.1 1.281

Bear in mind that the velocity projected is still 2900 + fps, which is pretty potent for Ontario moose.

 

[FOTIS]

Thank you Dr Mike! :lol:

 

[Alaska]

With the 180's H4350 @ 62.7 has worked very well along with w760 at 68.0. I use WLRM primers in WW brass. Really like the 300 WSM along with the 7mm WSM.