280AI loads using IMR7828 SSC

[BigTimber]

Hello
First post on forum, really enjoy reading the posts with very useful information. Just wondering if anybody has recipes for Kimber MTN Ascent in 280AI using 160 Partition. Was thinking of trying IMR 7828SSC, using Fed210M primers. Thanks for any responses.

 

[Dwh7271]

Welcome. Glad to have another 280 AI shooter.
A few posts down I believe muzz is working up a 7828 SSC load.
If you'd like some ideas, give us a barrel length and fired case H2O capacity, if you have it?
I'm not a lot of help as I've been running MRP.
Again, glad you're here.

 

[BigTimber]

I appreciate the reply, my Fired case capacity is 61.72 grains, barrel length 24". Weird how I was looking up some data and IMR website data states 58 grains of IMR 7828SSC for max load and Nosler load data starts at 57.5 grains of IMR 7828. IMR says you can use same load data, I'm sure there is a post regarding this and don't want to create more discussion if it has been discussed but Why the different loads one being a max load for one and the max load as a min load to start. Thanks

 

[DrMike]

Welcome aboard, Big Timber. IMR7828 and IMR7828SSC have identical burn rates. No doubt someone will shortly post a QL projection. In the interim, the difference between different published loads can be accounted for by differences in chamber volume, burn rate and the slight differences in barrel diameter.

 

[Dwh7271]

Here's one on standard case capacity and then one reduced down to yours.
We can tune these up a little if you run some across the chrono.

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler PART SP 16327
Useable Case Capaci: 66.323 grain H2O = 4.306 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7828 SSC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.812% 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

-08.1 92 57.70 2729 2645 45467 11884 95.4 1.332
-07.3 93 58.21 2754 2695 46719 11994 95.8 1.315
-06.5 94 58.72 2780 2746 48040 12101 96.2 1.298
-05.7 94 59.23 2806 2798 49386 12205 96.6 1.282
-04.9 95 59.74 2832 2850 50768 12305 96.9 1.265
-04.1 96 60.25 2858 2902 52203 12402 97.3 1.249
-03.2 97 60.76 2884 2955 53677 12495 97.6 1.233
-02.4 98 61.27 2910 3008 55195 12584 97.9 1.217
-01.6 98 61.78 2936 3062 56761 12670 98.1 1.201 ! Near Maximum !
-00.8 99 62.29 2962 3116 58377 12751 98.4 1.186 ! Near Maximum !
+00.0 100 62.80 2988 3171 60043 12829 98.6 1.171 ! Near Maximum !
+00.8 101 63.31 3013 3226 61757 12902 98.9 1.156 ! Near Maximum !
+01.6 102 63.82 3039 3281 63537 12972 99.1 1.141 ! Near Maximum !
+02.4 102 64.33 3065 3337 65371 13037 99.2 1.127 !DANGEROUS LOAD-DO NOT USE!
+03.2 103 64.84 3091 3394 67264 13097 99.4 1.112 !DANGEROUS LOAD-DO NOT USE!
+04.1 104 65.35 3116 3450 69219 13153 99.5 1.098 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 100 62.80 3068 3345 66440 12715 99.9 1.122 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 62.80 2893 2973 54099 12738 96.1 1.226

Your capacity.

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler PART SP 16327
Useable Case Capaci: 61.719 grain H2O = 4.007 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7828 SSC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.812% 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

-08.1 99 57.70 2833 2851 52820 11848 96.7 1.235
-07.3 100 58.21 2860 2907 54418 11943 97.1 1.218
-06.5 100 58.72 2888 2963 56071 12034 97.4 1.201 ! Near Maximum !
-05.7 101 59.23 2915 3019 57779 12121 97.7 1.185 ! Near Maximum !
-04.9 102 59.74 2943 3077 59545 12204 98.0 1.169 ! Near Maximum !
-04.1 103 60.25 2970 3134 61375 12283 98.3 1.153 ! Near Maximum !
-03.2 104 60.76 2998 3192 63262 12357 98.6 1.137 ! Near Maximum !
-02.4 105 61.27 3025 3251 65228 12427 98.8 1.121 !DANGEROUS LOAD-DO NOT USE!
-01.6 106 61.78 3052 3310 67257 12492 99.0 1.106 !DANGEROUS LOAD-DO NOT USE!
-00.8 107 62.29 3080 3370 69363 12553 99.2 1.091 !DANGEROUS LOAD-DO NOT USE!
+00.0 107 62.80 3107 3430 71544 12608 99.4 1.076 !DANGEROUS LOAD-DO NOT USE!
+00.8 108 63.31 3135 3491 73804 12658 99.5 1.062 !DANGEROUS LOAD-DO NOT USE!
+01.6 109 63.82 3162 3552 76147 12704 99.7 1.047 !DANGEROUS LOAD-DO NOT USE!
+02.4 110 64.33 3189 3613 78583 12744 99.8 1.033 !DANGEROUS LOAD-DO NOT USE!
+03.2 111 64.84 3216 3675 81109 12779 99.9 1.019 !DANGEROUS LOAD-DO NOT USE!
+04.1 112 65.35 3244 3738 83734 12808 99.9 1.005 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 107 62.80 3185 3603 79267 12376 100.0 1.033 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 107 62.80 3014 3228 64369 12637 97.4 1.126 !DANGEROUS LOAD-DO NOT USE!

 

[sask boy]

Welcome Big Timber, I am sure you are going to like this forum as the people here are some of the most knowledgeable on the Net and are a lot of fun as well.
I look forward to your range report and photos when you start working on that load. I have not been able to find any partitions around where I live, however I have been playing with the 150gr. ABLRs and they look to be just what the doctor order for my rifle :wink:!!
Blessings,
Dan

 

[Oldtrader3]

Sixty grains of IMR 7828 will push that 160 as fast as my 24 inch barrel, 7mm Mag pushes it. It will do the job at any range with that bullet?

 

[JD338]

BigTimber,

Welcome to the forum, glad you are here.
I have had great luck with RL22 in my 280AI with the 160 gr AB. This group went .092".

With IMR7828SSC and the 168 gr ABLR, I shot this group that went .056".

JD338