.270 wsm 140 gr accubond

Shane · Jan 3, 2018

Getting ready to run some test loads using one 4350. Does any have any info for this load. I'm seating at 2.27 from the ojive which is 5 thousandths off my lands. Just curious if anyone else has used this combo

DrMike · Jan 3, 2018

Welcome aboard, Shane. Good to see your post. I believe most of us that have used the AccuBond have observed that we get better accuracy with longer jumps to the lands. I typically allow 0.100 inch jumps in order to wring the greatest accuracy of out the bullet. QL projects a maximum charge of 61.5 grains of H4350 for a projected muzzle velocity of 3100 fps, which would give you a fine load for most any game you might wish to hunt. You can perhaps wring a bit more velocity out of the cartridge with other powders, but H4350 is a good choice for propellant. Again, welcome aboard.

AFG270 · Jan 3, 2018

I agree with DrMike, I got the best accuracy at .100 off the rifling. My rifle shoots this bullet 1/2 MOA using RL26 at about 3200 fps. I started at .050 off and they really came together as I seated them shorter.

Shane · Jan 3, 2018

Thanks for the info. I'll keep that in mind as I work these up. These are being loaded for my dad. Main use will be for mule deer, elk, black Bear. Should be IMR 4350. Stupid auto correct

DrMike · Jan 3, 2018

Code:

Cartridge          : .270 WSM
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 71.442 grain H2O = 4.639 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4350

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   84    55.17   2820    2472   46877  10986     98.2    1.313
-09.0   85    55.78   2848    2522   48281  11091     98.5    1.295
-08.0   86    56.40   2876    2571   49723  11192     98.7    1.277
-07.0   87    57.01   2904    2621   51205  11289     99.0    1.259
-06.0   88    57.62   2932    2672   52728  11383     99.2    1.242
-05.0   89    58.24   2959    2722   54294  11472     99.3    1.226  ! Near Maximum !
-04.0   90    58.85   2987    2773   55903  11558     99.5    1.209  ! Near Maximum !
-03.0   91    59.46   3014    2824   57558  11639     99.6    1.193  ! Near Maximum !
-02.0   92    60.07   3041    2876   59259  11717     99.7    1.177  ! Near Maximum !
-01.0   93    60.69   3069    2927   61008  11789     99.8    1.161  ! Near Maximum !
+00.0   94    61.30   3096    2979   62807  11858     99.9    1.146  ! Near Maximum !
+01.0   95    61.91   3123    3031   64657  11922    100.0    1.131  !DANGEROUS LOAD-DO NOT USE!
+02.0   95    62.53   3150    3084   66560  11981    100.0    1.117  !DANGEROUS LOAD-DO NOT USE!
+03.0   96    63.14   3176    3136   68517  12036    100.0    1.102  !DANGEROUS LOAD-DO NOT USE!
+04.0   97    63.75   3203    3189   70531  12089    100.0    1.088  !DANGEROUS LOAD-DO NOT USE!
+05.0   98    64.37   3229    3242   72603  12141    100.0    1.074  !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     94    61.30   3200    3183   72874  11475    100.0    1.074  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     94    61.30   2945    2697   52730  11885     96.9    1.241

sask boy · Jan 4, 2018

Thank you DrMike for the Quick load chart as I have started the task of cleaning up the Man Cave and will be spending some time there over the next few months.

Blessings,
Dan

Richracer1 · Jan 4, 2018

While I didn't develop a load using IMR4350, here's my 270WSM 140AB load:

61.5gn RL-19
GM215M
COL (tip to base): 2.875"
Avg FPS: 3020

It may not be the fastest but it's dang accurate.

DrMike · Jan 4, 2018

ReLoder 19 has always given me excellent ballistics and accuracy across the WSM spectrum. If I was restricted to one powder, RL19 would be a good one to have.