Quickload request for 280AI 150LRAB MRP

[MAinAR]

I got a jug of MRP coming this week and was wondering if someone could give me some QL info bout what to expect......

Could I please get a Quickload estimate on this setup:

Nosler 280AI
Nosler Brass
Fed215GM
OAL 3.33
Norma MRP Powder
27" barrel
150LRAB

 

[Dwh7271]

I capped it at 62K, obviously, there should be more room but gives you some rough numbers

Cartridge : .280 Ack Imp
Bullet : .284, 150, Nosler AccuBond LR 58734
Useable Case Capaci: 65.284 grain H2O = 4.239 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Norma MRP

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 80 50.24 2476 2042 28417 8873 91.3 1.706
-18.0 82 51.50 2541 2150 30386 9161 92.6 1.661
-16.0 84 52.75 2606 2262 32500 9436 93.9 1.617
-14.0 86 54.01 2671 2376 34766 9696 95.0 1.574
-12.0 88 55.26 2736 2493 37205 9942 96.1 1.532
-10.0 90 56.52 2801 2613 39826 10170 97.0 1.485
-08.0 92 57.78 2866 2736 42646 10381 97.8 1.438
-06.0 94 59.03 2931 2861 45683 10571 98.5 1.393
-04.0 96 60.29 2995 2988 48956 10741 99.0 1.350
-02.0 98 61.54 3059 3117 52493 10889 99.5 1.308
+00.0 100 62.80 3123 3248 56311 11013 99.8 1.268 ! Near Maximum !
+02.0 102 64.06 3186 3381 60442 11113 100.0 1.229 ! Near Maximum !
+04.0 104 65.31 3249 3516 64908 11189 100.0 1.191 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 66.57 3311 3652 69707 11253 100.0 1.155 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 67.82 3373 3790 74889 11313 100.0 1.120 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 69.08 3434 3929 80494 11369 100.0 1.087 !DANGEROUS LOAD-DO NOT USE!

 

[DrMike]

artridge : .280 Ack Imp
Bullet : .284, 150, Nosler AccuBond LR 58734 G7
Useable Case Capaci: 65.284 grain H2O = 4.239 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 27.0 inch = 685.8 mm
Powder : Norma MRP

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 83 52.08 2571 2202 31351 9290 93.2 1.639
-18.0 85 53.38 2638 2319 33617 9568 94.5 1.596
-16.0 87 54.68 2706 2439 36058 9831 95.6 1.554
-14.0 89 55.99 2773 2562 38688 10075 96.6 1.505
-12.0 91 57.29 2841 2688 41525 10301 97.5 1.456
-10.0 93 58.59 2908 2816 44587 10506 98.3 1.409
-08.0 95 59.89 2975 2947 47899 10690 98.9 1.363
-06.0 97 61.19 3041 3081 51480 10850 99.4 1.320
-04.0 100 62.50 3108 3217 55359 10985 99.7 1.277 ! Near Maximum !
-02.0 102 63.80 3173 3354 59563 11095 99.9 1.237 ! Near Maximum !
+00.0 104 65.10 3239 3493 64132 11178 100.0 1.198 ! Near Maximum !
+02.0 106 66.40 3303 3634 69052 11245 100.0 1.160 !DANGEROUS LOAD-DO NOT USE!
+04.0 108 67.70 3367 3776 74376 11307 100.0 1.124 !DANGEROUS LOAD-DO NOT USE!
+06.0 110 69.01 3431 3920 80152 11366 100.0 1.089 !DANGEROUS LOAD-DO NOT USE!
+08.0 112 70.31 3494 4066 86428 11419 100.0 1.055 !DANGEROUS LOAD-DO NOT USE!
+10.0 114 71.61 3557 4214 93263 11468 100.0 1.022 !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 104 65.10 3372 3788 79090 10692 100.0 1.105 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 65.10 3036 3070 50511 11337 96.8 1.323

 

[JD338]

MRP looks pretty good, similar to RL22.
I am getting just north of 3100 fps from a 24" barrel with RL22.

JD338

 

[MAinAR]

The 27" barrel look to be better served probably with RL 26 but will test both.