243 Quick Load

[George Foster]

Dr. Mike,

I am wondering if you could run the following for me.

243 Win
22" Barrel
IMR4831 Powder
75 Sierra Hp
Rem Case
Fed 210 M Primer
2.710 COL

Thank You in advance.

 

[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 4831

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   93    42.84   2993    1492   42515  10933     96.4    1.180
-09.0   94    43.32   3026    1525   43966  11046     96.8    1.162
-08.0   95    43.79   3059    1559   45466  11154     97.2    1.144
-07.0   96    44.27   3092    1593   47015  11258     97.6    1.126
-06.0   97    44.74   3126    1627   48616  11356     98.0    1.109
-05.0   98    45.22   3159    1661   50270  11449     98.3    1.092
-04.0   99    45.70   3191    1696   51980  11536     98.6    1.076  ! Near Maximum !
-03.0  100    46.17   3224    1731   53746  11618     98.9    1.059  ! Near Maximum !
-02.0  101    46.65   3257    1766   55573  11694     99.2    1.043  ! Near Maximum !
-01.0  102    47.12   3289    1802   57461  11764     99.4    1.028  ! Near Maximum !
+00.0  103    47.60   3322    1837   59412  11829     99.6    1.012  ! Near Maximum !
+01.0  104    48.08   3354    1873   61431  11887     99.7    0.997  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    48.55   3386    1909   63518  11939     99.8    0.982  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    49.03   3418    1945   65677  11985     99.9    0.968  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    49.50   3449    1981   67911  12024    100.0    0.953  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    49.98   3481    2018   70223  12057    100.0    0.939  !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    47.60   3468    2003   71200  11430    100.0    0.934  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    47.60   3114    1615   47850  11665     94.9    1.116

 

[George Foster]

Dr. Mike, Thank You!!

 

[Joec7651]

IMR4831 goes with the 243 like butter goes with bread. It’s not fancy but it shoots great in hot or cold weather, and with light to heavy bullets. Sometimes new isn’t better.

 

[George Foster]

Over the years I have used a lot of IMR4831 in both my 243's and 6mm's. Anymore I use more RL19 than anything else.

 

[JD338]

I always had great success with IMR4895 with the lightweight bullets and IMR4350 with the heavyweight bullets in the 243 Win.

JD338

 

[George Foster]

I am a simple person and I like to use one powder for the bullet weights I shoot. In both the 243 and 6mm I have found over the years I can get my most accurate loads for both calibers with RL19. IMR4064 and IMR4831 are both good also for the bullets I shoot but not as good as RL19. Especially in today's evnviroment it is nice to only having to worry about getting one powder.