4451 load

[Bruce Mc]

could one of you gentlemen run this load in quickloads and give me some idea the pressure its generating?

.270 win. 130 gr nosler Partition
57 gr IMR 4451. Fed 210 primer
3.32" oal. 3128 fps avg velocity
win case. 69.58 gr water
22" barrel

 

[ksubuck]

Haven't figured out how to make the transfer pretty yet, but this should do.

Cartridge : .270 Win. (SAAMI)
Bullet : .277, 130, Nosler PART SP 16322
Useable Case Capaci: 63.160 grain H2O = 4.101 cm³
Cartridge O.A.L. L6: 3.320 inch = 84.33 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : IMR 4451 Enduron ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.879% 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

-08.8 90 51.99 2871 2380 52734 11825 96.8 1.115
-07.9 91 52.49 2897 2423 54164 11934 97.1 1.101
-07.0 92 52.99 2923 2466 55631 12040 97.4 1.088 ! Near Maximum !
-06.2 93 53.49 2949 2510 57137 12144 97.6 1.074 ! Near Maximum !
-05.3 94 53.99 2975 2554 58682 12245 97.9 1.061 ! Near Maximum !
-04.4 95 54.50 3000 2598 60269 12343 98.2 1.048 ! Near Maximum !
-03.5 96 55.00 3026 2643 61897 12438 98.4 1.035 ! Near Maximum !
-02.6 96 55.50 3052 2688 63569 12531 98.6 1.022 ! Near Maximum !
-01.8 97 56.00 3077 2733 65287 12619 98.8 1.010 !DANGEROUS LOAD-DO NOT USE!
-00.9 98 56.50 3103 2779 67050 12705 99.0 0.998 !DANGEROUS LOAD-DO NOT USE!
+00.0 99 57.00 3128 2825 68862 12788 99.2 0.986 !DANGEROUS LOAD-DO NOT USE!
+00.9 100 57.50 3154 2871 70723 12867 99.3 0.974 !DANGEROUS LOAD-DO NOT USE!
+01.8 101 58.00 3179 2917 72635 12942 99.5 0.962 !DANGEROUS LOAD-DO NOT USE!
+02.6 102 58.50 3204 2964 74600 13015 99.6 0.951 !DANGEROUS LOAD-DO NOT USE!
+03.5 103 59.00 3229 3011 76619 13083 99.7 0.940 !DANGEROUS LOAD-DO NOT USE!
+04.4 103 59.50 3255 3058 78695 13148 99.8 0.928 !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 99 57.00 3191 2939 74209 12692 99.9 0.953 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 99 57.00 3055 2694 63523 12747 97.5 1.023 ! Near Maximum !

 

[Bruce Mc]

hmmm!
thankyou for the data.

 

[ksubuck]

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Nosler PART SP 16322
Useable Case Capaci: 63.160 grain H2O = 4.101 cm³
Cartridge O.A.L. L6: 3.320 inch = 84.33 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 4451 Enduron ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.879% 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

-08.8   90    51.99   2871    2380   52734  11825     96.8    1.115
-07.9   91    52.49   2897    2423   54164  11934     97.1    1.101
-07.0   92    52.99   2923    2466   55631  12040     97.4    1.088  ! Near Maximum !
-06.2   93    53.49   2949    2510   57137  12144     97.6    1.074  ! Near Maximum !
-05.3   94    53.99   2975    2554   58682  12245     97.9    1.061  ! Near Maximum !
-04.4   95    54.50   3000    2598   60269  12343     98.2    1.048  ! Near Maximum !
-03.5   96    55.00   3026    2643   61897  12438     98.4    1.035  ! Near Maximum !
-02.6   96    55.50   3052    2688   63569  12531     98.6    1.022  ! Near Maximum !
-01.8   97    56.00   3077    2733   65287  12619     98.8    1.010  !DANGEROUS LOAD-DO NOT USE!
-00.9   98    56.50   3103    2779   67050  12705     99.0    0.998  !DANGEROUS LOAD-DO NOT USE!
+00.0   99    57.00   3128    2825   68862  12788     99.2    0.986  !DANGEROUS LOAD-DO NOT USE!
+00.9  100    57.50   3154    2871   70723  12867     99.3    0.974  !DANGEROUS LOAD-DO NOT USE!
+01.8  101    58.00   3179    2917   72635  12942     99.5    0.962  !DANGEROUS LOAD-DO NOT USE!
+02.6  102    58.50   3204    2964   74600  13015     99.6    0.951  !DANGEROUS LOAD-DO NOT USE!
+03.5  103    59.00   3229    3011   76619  13083     99.7    0.940  !DANGEROUS LOAD-DO NOT USE!
+04.4  103    59.50   3255    3058   78695  13148     99.8    0.928  !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     99    57.00   3191    2939   74209  12692     99.9    0.953  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    57.00   3055    2694   63523  12747     97.5    1.023  ! Near Maximum !

Fixed it. Does look a bit hot. Do you have any other velocity data points which would show how close the predictions are?

 

[Bruce Mc]

same specs 56gr of 4451 yielded 3038 fps.

 

[ksubuck]

I cannot get the model to match both of your data points at the same time. I have had a little concern that the QL numbers for the Enduron powders doesn't fit very well with my previous load work with them. The burn rate with 4451 is quite a bit higher in the program compared to what I see with my loads and with your loads.

Anyone else have any thoughts? How significant is the Degressivity Factor a0? There is no value for degressivity listed in QL.

 

[Partisan]

I cannot get the model to match both of your data points at the same time. I have had a little concern that the QL numbers for the Enduron powders doesn't fit very well with my previous load work with them. The burn rate with 4451 is quite a bit higher in the program compared to what I see with my loads and with your loads.

Anyone else have any thoughts? How significant is the Degressivity Factor a0? There is no value for degressivity listed in QL.

Same thing for me. I can't answer your Degressivity question but the update that added IMR 4451 to the powder base has a much faster burn rate factor than even IMR 4895. That doesn't match my own chrono and load data...