I started this project with the hopes of hitting 3100 fps with the 150 ABLR. I chose IMR 4350 because it's on the faster side of H4350 and R17. It's an awesome powder for the 284 platform because it handles all bullets from 120-180gr. I started off with 53.5 gr and went up to 56 gr. with a case overall length of 2.956" which is accurate mag length.
53.5 = 3050
54.0 = 3100
55.0 = 3200
55.5 = 3225
56.0 = 3257 Hot! Stiff bolt handle and not much velocity gain to justify pressure.
I was tickled as a pig in shit when I first read the chrono. My suspicion got the better of me so I checked the chrono in between 5 shot firings against my GAP 308. The velocities I've proven stayed true with the .308. I'm considering trading a friend for his stock savage dbm setup so I can get 3.00" instead of being limited to 2.956".
I was wondering why no one has bothered with IMR 4350 in their 284. I believe it's a very good powder for most combinations. I'm running a blueprinted savage short action with accurate mag bottom metal and dbm, krieger 9 twist @ 28" with brake, manners t3 stock, nightforce 20 moa base, warne rings, and bushnell 6500 6-24x50 ffp g2dmr.
If the bc holds up on these bullets I believe I'll have stumbled onto something very special, and apparently something that hasn't been toyed with much. What's y'alls thoughts?
Here's a couple pics of the chrono reading after 55gr and the rifle. The 54gr charge was the most accurate at 1/4" at 100 and the worst was a tie between the 55.5 and 56 at 3/4". It's still a new barrel so I hope the accuracy will stay with the 54.5 ish loads. If I can stay at 3150 or 3100 ish I'll be happy.
Code:
Cartridge : .284 Win.
Bullet : .284, 150, Nosler Accubond LR 58734 G7
Useable Case Capaci: 57.239 grain H2O = 3.716 cm³
Cartridge O.A.L. L6: 2.956 inch = 75.08 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : IMR 4350
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 82 42.80 2481 2050 34054 6917 93.4 1.644
-18.0 84 43.87 2538 2145 36320 7106 94.3 1.602
-16.0 86 44.94 2594 2242 38718 7288 95.3 1.558
-14.0 88 46.01 2651 2341 41245 7460 96.1 1.513
-12.0 90 47.08 2708 2442 43927 7624 96.8 1.470
-10.0 92 48.15 2764 2544 46780 7778 97.5 1.429
-08.0 94 49.22 2820 2648 49818 7921 98.1 1.389
-06.0 96 50.29 2875 2753 53052 8054 98.6 1.351
-04.0 98 51.36 2931 2860 56498 8175 99.1 1.314 ! Near Maximum !
-02.0 100 52.43 2985 2969 60172 8284 99.4 1.278 ! Near Maximum !
+00.0 102 53.50 3040 3078 64091 8380 99.7 1.244 !DANGEROUS LOAD-DO NOT USE!
+02.0 104 54.57 3094 3189 68277 8464 99.9 1.211 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 55.64 3148 3301 72751 8534 100.0 1.179 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 56.71 3201 3413 77538 8590 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 57.78 3254 3527 82666 8639 100.0 1.119 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 58.85 3307 3642 88167 8686 100.0 1.090 !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 102 53.50 3146 3296 75259 8063 100.0 1.167 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 53.50 2887 2777 53120 8382 96.0 1.346
53.5 = 3050
54.0 = 3100
55.0 = 3200
55.5 = 3225
56.0 = 3257 Hot! Stiff bolt handle and not much velocity gain to justify pressure.
I was tickled as a pig in shit when I first read the chrono. My suspicion got the better of me so I checked the chrono in between 5 shot firings against my GAP 308. The velocities I've proven stayed true with the .308. I'm considering trading a friend for his stock savage dbm setup so I can get 3.00" instead of being limited to 2.956".
I was wondering why no one has bothered with IMR 4350 in their 284. I believe it's a very good powder for most combinations. I'm running a blueprinted savage short action with accurate mag bottom metal and dbm, krieger 9 twist @ 28" with brake, manners t3 stock, nightforce 20 moa base, warne rings, and bushnell 6500 6-24x50 ffp g2dmr.
If the bc holds up on these bullets I believe I'll have stumbled onto something very special, and apparently something that hasn't been toyed with much. What's y'alls thoughts?
Here's a couple pics of the chrono reading after 55gr and the rifle. The 54gr charge was the most accurate at 1/4" at 100 and the worst was a tie between the 55.5 and 56 at 3/4". It's still a new barrel so I hope the accuracy will stay with the 54.5 ish loads. If I can stay at 3150 or 3100 ish I'll be happy.
Code:
Cartridge : .284 Win.
Bullet : .284, 150, Nosler Accubond LR 58734 G7
Useable Case Capaci: 57.239 grain H2O = 3.716 cm³
Cartridge O.A.L. L6: 2.956 inch = 75.08 mm
Barrel Length : 28.0 inch = 711.2 mm
Powder : IMR 4350
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 82 42.80 2481 2050 34054 6917 93.4 1.644
-18.0 84 43.87 2538 2145 36320 7106 94.3 1.602
-16.0 86 44.94 2594 2242 38718 7288 95.3 1.558
-14.0 88 46.01 2651 2341 41245 7460 96.1 1.513
-12.0 90 47.08 2708 2442 43927 7624 96.8 1.470
-10.0 92 48.15 2764 2544 46780 7778 97.5 1.429
-08.0 94 49.22 2820 2648 49818 7921 98.1 1.389
-06.0 96 50.29 2875 2753 53052 8054 98.6 1.351
-04.0 98 51.36 2931 2860 56498 8175 99.1 1.314 ! Near Maximum !
-02.0 100 52.43 2985 2969 60172 8284 99.4 1.278 ! Near Maximum !
+00.0 102 53.50 3040 3078 64091 8380 99.7 1.244 !DANGEROUS LOAD-DO NOT USE!
+02.0 104 54.57 3094 3189 68277 8464 99.9 1.211 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 55.64 3148 3301 72751 8534 100.0 1.179 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 56.71 3201 3413 77538 8590 100.0 1.148 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 57.78 3254 3527 82666 8639 100.0 1.119 !DANGEROUS LOAD-DO NOT USE!
+10.0 112 58.85 3307 3642 88167 8686 100.0 1.090 !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 102 53.50 3146 3296 75259 8063 100.0 1.167 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 53.50 2887 2777 53120 8382 96.0 1.346