NOSLER 270 (.277) 165gr SP AccuBond-LR
- Thread starter mike06
- Start date
amassi
Beginner
- Jul 6, 2018
- 66
- 0
What cartridge? You have the requisite 1:8.5 twist or faster barrel?
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- Thread starter
- #3
amassi
Beginner
- Jul 6, 2018
- 66
- 0
They wont stabilize out of a 10 twistmike06":2sr41vb1 said:
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- Thread starter
- #5
assasinator
Beginner
- Oct 14, 2023
- 26
- 17
i have HUNDREDS of 165 ABLR for my 7 twist 270Bee. using n570 its a BAD 3200FPS with a 27" barrel. 3.45" COAL, but i have many different COAL i use. my chamber is cut .600" long.
Cartridge : .270 Weath. Mag.
Bullet : .277, 165, Nosler AccuBond LR
Useable Case Capaci: 73.160 grain H2O = 4.750 cm³
Cartridge O.A.L. L6: 3.450 inch = 87.63 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Vihtavuori N570 *C
Predicted data by increasing and decreasing the given charge,
incremented in steps of 3.0% 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
-30.0 75 53.20 2025 1503 18045 8669 73.4 2.311
-27.0 78 55.48 2139 1676 20456 9422 77.2 2.173
-24.0 81 57.76 2254 1862 23174 10161 80.8 2.045
-21.0 84 60.04 2371 2060 26241 10877 84.2 1.926
-18.0 88 62.32 2489 2270 29705 11560 87.3 1.815
-15.0 91 64.60 2607 2491 33627 12199 90.1 1.711
-12.0 94 66.88 2726 2723 38073 12787 92.6 1.614
-09.0 97 69.16 2845 2966 43126 13314 94.8 1.523
-06.0 100 71.44 2963 3218 48888 13771 96.6 1.438
-03.0 104 73.72 3081 3478 55476 14152 98.0 1.358 ! Near Maximum !
+00.0 107 76.00 3198 3747 62998 14449 99.0 1.283 ! Near Maximum !
+03.0 110 78.28 3314 4023 71556 14655 99.7 1.214 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 80.56 3428 4306 81332 14765 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+09.0 117 82.84 3541 4594 92557 14799 100.0 1.086 !DANGEROUS LOAD-DO NOT USE!
+12.0 120 85.12 3652 4888 105521 14813 100.0 1.028 !DANGEROUS LOAD-DO NOT USE!
+15.0 123 87.40 3763 5188 120600 14808 100.0 0.973 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 15% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 15% relative to nominal value:
+Ba 107 76.00 3441 4338 88712 13564 100.0 1.118 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 15% relative to nominal value:
-Ba 107 76.00 2785 2841 41565 13379 86.3 1.540
LETS BE CLEAR, THIS CANNOT BE USED WITH A STOCK CHAMBER!!!!!!!!!!!!!!! even weatherby freebore is not enough.
MY CHAMBER IS A NATIONAL MATCH CHAMBER WITH A .600" THROAT. my bullets touch up a 3.82" COAL.
HOWEVER, it illustrates what can be achieved with a long barrel, a match chamber, and a long throat that matches the intended bullets.
its really not suitable for a 140 GR SST. i had to crimp 140 SST HARD to get the retumbo i used for that bullet. i only achieved 2800 fps with a 140SST with unburned powder and the case didnt expand.
its a trade off to get the 270 Bee to really perform with 150 to 175gr.
so you know.
Cartridge : .270 Weath. Mag.
Bullet : .277, 165, Nosler AccuBond LR
Useable Case Capaci: 73.160 grain H2O = 4.750 cm³
Cartridge O.A.L. L6: 3.450 inch = 87.63 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Vihtavuori N570 *C
Predicted data by increasing and decreasing the given charge,
incremented in steps of 3.0% 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
-30.0 75 53.20 2025 1503 18045 8669 73.4 2.311
-27.0 78 55.48 2139 1676 20456 9422 77.2 2.173
-24.0 81 57.76 2254 1862 23174 10161 80.8 2.045
-21.0 84 60.04 2371 2060 26241 10877 84.2 1.926
-18.0 88 62.32 2489 2270 29705 11560 87.3 1.815
-15.0 91 64.60 2607 2491 33627 12199 90.1 1.711
-12.0 94 66.88 2726 2723 38073 12787 92.6 1.614
-09.0 97 69.16 2845 2966 43126 13314 94.8 1.523
-06.0 100 71.44 2963 3218 48888 13771 96.6 1.438
-03.0 104 73.72 3081 3478 55476 14152 98.0 1.358 ! Near Maximum !
+00.0 107 76.00 3198 3747 62998 14449 99.0 1.283 ! Near Maximum !
+03.0 110 78.28 3314 4023 71556 14655 99.7 1.214 !DANGEROUS LOAD-DO NOT USE!
+06.0 113 80.56 3428 4306 81332 14765 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+09.0 117 82.84 3541 4594 92557 14799 100.0 1.086 !DANGEROUS LOAD-DO NOT USE!
+12.0 120 85.12 3652 4888 105521 14813 100.0 1.028 !DANGEROUS LOAD-DO NOT USE!
+15.0 123 87.40 3763 5188 120600 14808 100.0 0.973 !DANGEROUS LOAD-DO NOT USE!
Results caused by ± 15% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 15% relative to nominal value:
+Ba 107 76.00 3441 4338 88712 13564 100.0 1.118 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 15% relative to nominal value:
-Ba 107 76.00 2785 2841 41565 13379 86.3 1.540
LETS BE CLEAR, THIS CANNOT BE USED WITH A STOCK CHAMBER!!!!!!!!!!!!!!! even weatherby freebore is not enough.
MY CHAMBER IS A NATIONAL MATCH CHAMBER WITH A .600" THROAT. my bullets touch up a 3.82" COAL.
HOWEVER, it illustrates what can be achieved with a long barrel, a match chamber, and a long throat that matches the intended bullets.
its really not suitable for a 140 GR SST. i had to crimp 140 SST HARD to get the retumbo i used for that bullet. i only achieved 2800 fps with a 140SST with unburned powder and the case didnt expand.
its a trade off to get the 270 Bee to really perform with 150 to 175gr.
so you know.
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