Quickload Request

[sithlord6512]

Hi There,

Can somebody please run a Quickload for a 300 WSM, VV-N550 and 168 grain TTSX. John Barness, suggests 64.0 grains as his pet load for 165 grainers in this caliber. I am wondering it that is safe my intended bullet. Thanks.

Oops - barrel is 24 inches and case capacity is approx. 80.92 grains of water.

 

[DrMike]

You should be good with that charge of VN550.

Cartridge : .300 WSM (CIP)
Bullet : .308, 168, Barnes 'TTSX'BT 30878
Useable Case Capaci: 69.485 grain H2O = 4.512 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Vihtavuori N550

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 51.20 2481 2295 33369 8628 94.7 1.495
-18.0 80 52.48 2539 2404 35514 8865 95.6 1.456
-16.0 82 53.76 2597 2515 37795 9091 96.5 1.419
-14.0 84 55.04 2655 2629 40222 9305 97.2 1.383
-12.0 86 56.32 2712 2744 42802 9507 97.9 1.347
-10.0 88 57.60 2770 2862 45545 9696 98.5 1.310
-08.0 90 58.88 2827 2981 48463 9870 99.0 1.273
-06.0 92 60.16 2884 3102 51567 10029 99.4 1.237
-04.0 94 61.44 2940 3224 54871 10172 99.7 1.202 ! Near Maximum !
-02.0 96 62.72 2996 3348 58388 10299 99.9 1.169 ! Near Maximum !
+00.0 98 64.00 3051 3473 62135 10408 100.0 1.136 ! Near Maximum !
+02.0 100 65.28 3106 3600 66129 10501 100.0 1.105 !DANGEROUS LOAD-DO NOT USE!
+04.0 102 66.56 3161 3727 70391 10588 100.0 1.075 !DANGEROUS LOAD-DO NOT USE!
+06.0 104 67.84 3215 3856 74940 10672 100.0 1.046 !DANGEROUS LOAD-DO NOT USE!
+08.0 106 69.12 3269 3986 79803 10753 100.0 1.018 !DANGEROUS LOAD-DO NOT USE!
+10.0 108 70.40 3322 4117 85007 10831 100.0 0.991 !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 64.00 3162 3730 73754 10026 100.0 1.058 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 98 64.00 2888 3111 50727 10503 97.1 1.240

Consequently, VN550 and VN560 are two of the most accurate powders I have found in the 300 WSM. They are virtually mandated to be in my powder magazine for this calibre.

 

[sithlord6512]

Thanks once again Dr. Mike,

Tried VV-N550, and accuracy was alright - nothing MOA though and not quite as accurate as H4350 has been for me.

With 165/168 grainers in the 300WSM, what has your experience shown you to be better - VV-N550 or N560. I know N550 is listed as the best for 180 grainers in the Nosler Manual 6. Very curious.

 

[DrMike]

I have primarily focused on 180 to 200 grain bullets with VN550 and VN560. Actually, I've found that faster powders work better with the 165/168 grain bullets. I run heavy for calibre in my own rifle. I am not really surprised that H4350 has served you well with the 165/168 grain bullets. I've had great success with IMR4831, with Hunter and with H380 in these particular bullets. These powders don't necessarily give me the highest velocities, but they do give me the best accuracy. The velocity is not all that far off the top mark, however.