243 Quick Load

[George Foster]

Dr. Mike,
I have to work up a load for my Son's 243 that is a long action and long throat. I seat my 243's at 2.630 but his will be seated at 2.710 and I don't know how much difference that makes. If you don't mind could you run the following for me. Thank You in advance!

243 Win
22" Barrel
75 Sierra HP
Rem Case
Fed 210M Primer
2.710 COL
Rl19 Powder

243 Win
22" Barrel
75 Sierra HP
Rem Case
Fed 210M Primer
2.710 COL
IMR4064 Powder

 

[DrMike]

Cartridge          : .243 Win.
Bullet             : .243, 75, Sierra HP 1510
Useable Case Capaci: 52.253 grain H2O = 3.393 cm³
Cartridge O.A.L. L6: 2.710 inch = 68.83 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 4064

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   83    37.98   2992    1491   44184  10263     97.5    1.139
-09.0   84    38.40   3022    1521   45503  10360     97.9    1.123
-08.0   85    38.82   3051    1550   46858  10454     98.2    1.108
-07.0   86    39.25   3080    1580   48250  10544     98.5    1.093
-06.0   87    39.67   3109    1610   49680  10631     98.7    1.078
-05.0   88    40.09   3138    1640   51148  10714     98.9    1.064
-04.0   89    40.51   3166    1670   52656  10793     99.2    1.050  ! Near Maximum !
-03.0   90    40.93   3195    1700   54205  10868     99.3    1.036  ! Near Maximum !
-02.0   91    41.36   3223    1730   55797  10939     99.5    1.023  ! Near Maximum !
-01.0   92    41.78   3251    1760   57431  11006     99.6    1.009  ! Near Maximum !
+00.0   93    42.20   3279    1791   59110  11068     99.8    0.996  ! Near Maximum !
+01.0   94    42.62   3307    1822   60836  11127     99.9    0.984  !DANGEROUS LOAD-DO NOT USE!
+02.0   95    43.04   3335    1852   62608  11181     99.9    0.971  !DANGEROUS LOAD-DO NOT USE!
+03.0   96    43.47   3362    1883   64430  11230    100.0    0.959  !DANGEROUS LOAD-DO NOT USE!
+04.0   96    43.89   3390    1914   66302  11275    100.0    0.947  !DANGEROUS LOAD-DO NOT USE!
+05.0   97    44.31   3417    1944   68226  11317    100.0    0.935  !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     93    42.20   3395    1920   68423  10743    100.0    0.932  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     93    42.20   3115    1615   49764  11005     96.3    1.080

Cartridge          : .243 Win.
Bullet             : .243, 75, Sierra HP 1510
Useable Case Capaci: 52.253 grain H2O = 3.393 cm³
Cartridge O.A.L. L6: 2.710 inch = 68.83 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-19 *C

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   92    44.55   2978    1477   41772  11087     90.2    1.168
-09.0   94    45.05   3013    1512   43206  11240     90.9    1.150
-08.0   95    45.54   3048    1547   44691  11390     91.5    1.132
-07.0   96    46.04   3083    1583   46229  11536     92.2    1.115
-06.0   97    46.53   3118    1619   47824  11678     92.8    1.098
-05.0   98    47.03   3153    1656   49475  11817     93.4    1.081
-04.0   99    47.52   3188    1693   51187  11952     93.9    1.064  ! Near Maximum !
-03.0  100    48.02   3223    1730   52963  12082     94.5    1.048  ! Near Maximum !
-02.0  101    48.51   3258    1768   54805  12209     95.0    1.032  ! Near Maximum !
-01.0  102    49.01   3293    1806   56714  12330     95.5    1.016  ! Near Maximum !
+00.0  103    49.50   3329    1845   58697  12447     96.0    1.001  ! Near Maximum !
+01.0  104    50.00   3364    1884   60752  12560     96.4    0.985  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    50.49   3399    1924   62883  12667     96.9    0.970  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    50.99   3434    1964   65084  12769     97.3    0.956  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    51.48   3469    2004   67359  12865     97.6    0.941  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    51.98   3504    2045   69719  12956     98.0    0.927  !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    103    49.50   3506    2047   70238  12549     99.6    0.924  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    49.50   3102    1602   47885  11732     88.4    1.098

 

[George Foster]

Thank You very much Dr. Mike!!