Dr. Mike

[George Foster]

Dr. Mike, Could I bother for one more QL. Thank You in Advance.
6mm Rem
70gr Speer TNT HP
Rem Case
2.860COL
24" Barrel
IMR 4064 Powder

 

[DrMike]

IMR 4064 is an old classic powder not often seen today. It wa, and is, highly effective in many cartridges.

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 52.374 grain H2O = 3.401 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 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 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   89    40.59   3327    1720   47283  10201     97.4    1.085
-09.0   90    41.04   3360    1755   48758  10298     97.8    1.070
-08.0   91    41.49   3394    1790   50276  10391     98.1    1.055
-07.0   92    41.94   3427    1825   51839  10481     98.4    1.040
-06.0   93    42.39   3460    1861   53448  10566     98.6    1.026
-05.0   94    42.85   3493    1896   55104  10648     98.9    1.012
-04.0   95    43.30   3526    1932   56810  10726     99.1    0.998  ! Near Maximum !
-03.0   96    43.75   3558    1968   58566  10800     99.3    0.984  ! Near Maximum !
-02.0   97    44.20   3591    2004   60375  10870     99.5    0.971  ! Near Maximum !
-01.0   98    44.65   3623    2041   62239  10935     99.6    0.958  ! Near Maximum !
+00.0   99    45.10   3656    2077   64158  10996     99.7    0.945  ! Near Maximum !
+01.0  100    45.55   3688    2114   66136  11053     99.8    0.932  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    46.00   3720    2151   68173  11105     99.9    0.920  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    46.45   3752    2188   70273  11153    100.0    0.907  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    46.90   3783    2225   72438  11195    100.0    0.896  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    47.36   3815    2262   74669  11234    100.0    0.884  !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    45.10   3727    2159   69393  10829    100.0    0.912  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    45.10   3571    1982   58928  11040     98.5    0.982  ! Near Maximum !

 

[George Foster]

Dr. Mike,

Thank You once again! I have usedIMR4064 in the 22-250,243 and 6mm for45 years. It is a Very Good One. I am just getting into using 70gr bullets.

 

[grry10]

The 6m/m Remington/.244 Remington is equal to or better in everyway to a .243 Winchester. It seems that it has been a forgotten cartridge. We need to see more positive articles about it, and not these so so articles that eventually swing to talking about a .243 Win. I've thought about building a light 6m/m Rem AI.

 

[George Foster]

I have owned three 6mm's over the years and now still own two. I have always liked them way more than the 243's and they have been more accurate for me than my 243's.