Quick load Request

George Foster · Oct 5, 2023

II was wondering if Dr. Mike would run me a test for 243 with 70HP Speer with IMR3031 and IMR4064.
243 Win
70HP Speer
24" barrel
2.630COL
Rem Case
Fed 210 Primer
IMR3031

243 Win
70HP Speer
24" barrel
2.630COL
Rem Case
Fed 210 Primer
IMR4064

JD338 · Oct 5, 2023

Don't overlook IMR4895. Awesome accuracy awaits you.

JD338

George Foster · Oct 5, 2023

I used to use it with the 85HPBT Sierra.

JD338 · Oct 5, 2023

Try it with the 70 grainers
I would have to look it up but I think it was 39.5 grs. *** please verify the load.***

JD338

DrMike · Oct 5, 2023

Code:

Cartridge          : .243 Win.
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 47.503 grain H2O = 3.084 cm³
Cartridge O.A.L. L6: 2.300 inch = 58.42 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 3031

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   75    30.72   2877    1287   31834   7949     98.6    1.337
-18.0   77    31.49   2939    1343   33948   8099     99.2    1.304
-16.0   79    32.26   3000    1399   36171   8233     99.6    1.272
-14.0   81    33.02   3060    1456   38524   8349     99.9    1.238
-12.0   83    33.79   3120    1513   41012   8447    100.0    1.203
-10.0   84    34.56   3178    1570   43641   8529    100.0    1.170
-08.0   86    35.33   3235    1626   46421   8607    100.0    1.139
-06.0   88    36.10   3291    1683   49358   8683    100.0    1.108
-04.0   90    36.86   3346    1740   52462   8757    100.0    1.079  ! Near Maximum !
-02.0   92    37.63   3400    1797   55741   8829    100.0    1.051  ! Near Maximum !
+00.0   94    38.40   3454    1854   59206   8899    100.0    1.025  ! Near Maximum !
+02.0   96    39.17   3506    1911   62868   8967    100.0    0.999  !DANGEROUS LOAD-DO NOT USE!
+04.0   98    39.94   3558    1968   66739   9033    100.0    0.974  !DANGEROUS LOAD-DO NOT USE!
+06.0   99    40.70   3610    2025   70833   9096    100.0    0.950  !DANGEROUS LOAD-DO NOT USE!
+08.0  101    41.47   3660    2083   75163   9157    100.0    0.927  !DANGEROUS LOAD-DO NOT USE!
+10.0  103    42.24   3711    2140   79745   9216    100.0    0.905  !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     94    38.40   3552    1961   70133   8618    100.0    0.957  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     94    38.40   3303    1696   48225   9297     99.9    1.117

DrMike · Oct 5, 2023

Code:

Cartridge          : .243 Win.
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 47.503 grain H2O = 3.084 cm³
Cartridge O.A.L. L6: 2.300 inch = 58.42 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4064

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   78    32.16   2797    1216   32009   7609     91.9    1.332
-18.0   80    32.96   2861    1272   34066   7820     93.1    1.302
-16.0   82    33.77   2924    1329   36246   8023     94.1    1.272
-14.0   84    34.57   2987    1387   38555   8216     95.1    1.238
-12.0   86    35.38   3049    1445   41001   8399     96.0    1.204
-10.0   87    36.18   3111    1505   43592   8571     96.8    1.171
-08.0   89    36.98   3173    1565   46336   8732     97.5    1.139
-06.0   91    37.79   3234    1626   49244   8881     98.1    1.108
-04.0   93    38.59   3295    1687   52325   9017     98.7    1.078  ! Near Maximum !
-02.0   95    39.40   3355    1749   55589   9139     99.1    1.050  ! Near Maximum !
+00.0   97    40.20   3414    1812   59051   9248     99.5    1.022  ! Near Maximum !
+02.0   99    41.00   3473    1875   62722   9342     99.7    0.996  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    41.81   3531    1938   66617   9421     99.9    0.970  !DANGEROUS LOAD-DO NOT USE!
+06.0  103    42.61   3589    2002   70754   9484    100.0    0.946  !DANGEROUS LOAD-DO NOT USE!
+08.0  105    43.42   3645    2066   75148   9534    100.0    0.922  !DANGEROUS LOAD-DO NOT USE!
+10.0  107    44.22   3701    2130   79820   9581    100.0    0.899  !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     97    40.20   3540    1948   68829   8970    100.0    0.956  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     97    40.20   3237    1628   49356   9153     95.4    1.109

George Foster · Oct 6, 2023

Dr. Mike,

Thank You very much, I feel pretty stupid, I put in 2.300 for a COL instead of 2.630COL.

George

DrMike · Oct 6, 2023

Code:

Cartridge          : .243 Win.
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 51.373 grain H2O = 3.336 cm³
Cartridge O.A.L. L6: 2.630 inch = 66.80 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4064

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   76    33.84   2824    1240   32367   8116     92.9    1.328
-18.0   78    34.69   2887    1296   34420   8335     94.0    1.298
-16.0   79    35.53   2950    1353   36590   8545     95.0    1.269
-14.0   81    36.38   3013    1411   38885   8745     95.9    1.235
-12.0   83    37.22   3075    1469   41311   8933     96.7    1.201
-10.0   85    38.07   3136    1529   43875   9110     97.4    1.168
-08.0   87    38.92   3197    1589   46584   9274     98.1    1.136
-06.0   89    39.76   3258    1649   49447   9425     98.6    1.106
-04.0   91    40.61   3317    1711   52474   9562     99.1    1.077  ! Near Maximum !
-02.0   93    41.45   3377    1772   55673   9685     99.5    1.049  ! Near Maximum !
+00.0   95    42.30   3435    1834   59056   9792     99.7    1.022  ! Near Maximum !
+02.0   96    43.15   3493    1896   62634   9884     99.9    0.996  !DANGEROUS LOAD-DO NOT USE!
+04.0   98    43.99   3550    1959   66421   9960    100.0    0.971  !DANGEROUS LOAD-DO NOT USE!
+06.0  100    44.84   3606    2021   70429  10022    100.0    0.947  !DANGEROUS LOAD-DO NOT USE!
+08.0  102    45.68   3662    2084   74674  10081    100.0    0.923  !DANGEROUS LOAD-DO NOT USE!
+10.0  104    46.53   3717    2147   79174  10137    100.0    0.901  !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     95    42.30   3557    1966   68559   9490    100.0    0.956  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     95    42.30   3262    1654   49568   9743     96.2    1.108

DrMike · Oct 6, 2023

Code:

Cartridge          : .243 Win.
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 51.373 grain H2O = 3.336 cm³
Cartridge O.A.L. L6: 2.630 inch = 66.80 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 3031

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   73    32.24   2899    1306   32339   8404     99.1    1.327
-18.0   75    33.05   2960    1362   34434   8554     99.5    1.298
-16.0   76    33.85   3020    1418   36647   8686     99.8    1.270
-14.0   78    34.66   3079    1474   38983   8800    100.0    1.236
-12.0   80    35.46   3137    1530   41447   8895    100.0    1.202
-10.0   82    36.27   3194    1586   44046   8984    100.0    1.169
-08.0   84    37.08   3250    1642   46785   9071    100.0    1.138
-06.0   86    37.88   3305    1698   49673   9156    100.0    1.108
-04.0   87    38.69   3360    1754   52716   9239    100.0    1.079  ! Near Maximum !
-02.0   89    39.49   3413    1810   55924   9320    100.0    1.052  ! Near Maximum !
+00.0   91    40.30   3465    1866   59304   9398    100.0    1.026  ! Near Maximum !
+02.0   93    41.11   3517    1923   62866   9475    100.0    1.000  !DANGEROUS LOAD-DO NOT USE!
+04.0   95    41.91   3568    1979   66621   9550    100.0    0.976  !DANGEROUS LOAD-DO NOT USE!
+06.0   96    42.72   3619    2035   70579   9622    100.0    0.952  !DANGEROUS LOAD-DO NOT USE!
+08.0   98    43.52   3668    2092   74754   9692    100.0    0.930  !DANGEROUS LOAD-DO NOT USE!
+10.0  100    44.33   3718    2148   79158   9759    100.0    0.908  !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     91    40.30   3561    1971   69818   9124    100.0    0.958  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     91    40.30   3320    1714   48638   9798    100.0    1.117