Quick Load Request for Dr. Mike

[George Foster]

Dr. Mike,
Could you please give a quick load for the following, I will thank You in advance.

6mm Rem
70gr Speer HP TNT
Rem Case
2.860 COL
22" Barrel
RL19 Powder

 

[TexasLife]

@ 2.860" there's barely enough in the neck to hold it (.163"). 2.800-2.830 might be better!

 

[TexasLife]

53.1 @ 109.7% fill, 3,651 fps at max pressure w/64,745psi. 50.1 @ 103.5% fill 3,419fps w/52,700psi. Based on 54.4 case volume and 52.489 usable.

 

[DrMike]

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 52.372 grain H2O = 3.400 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 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 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   88    42.33   2842    1256   31632  10162     80.6    1.230
-18.0   90    43.39   2919    1324   33904  10556     82.3    1.197
-16.0   92    44.44   2997    1396   36352  10945     84.0    1.164
-14.0   94    45.50   3075    1470   38984  11327     85.6    1.128
-12.0   96    46.56   3154    1547   41817  11700     87.2    1.091
-10.0   99    47.62   3234    1626   44872  12063     88.7    1.056
-08.0  101    48.68   3315    1708   48165  12413     90.1    1.021
-06.0  103    49.74   3396    1792   51723  12748     91.5    0.988
-04.0  105    50.79   3477    1879   55568  13068     92.8    0.956  ! Near Maximum !
-02.0  107    51.85   3559    1969   59731  13368     93.9    0.925  ! Near Maximum !
+00.0  110    52.91   3641    2061   64245  13649     95.0    0.895  ! Near Maximum !
+02.0  112    53.97   3724    2155   69147  13908     96.0    0.866  !DANGEROUS LOAD-DO NOT USE!
+04.0  114    55.03   3806    2252   74476  14143     96.9    0.838  !DANGEROUS LOAD-DO NOT USE!
+06.0  116    56.08   3889    2351   80287  14352     97.7    0.810  !DANGEROUS LOAD-DO NOT USE!
+08.0  118    57.14   3972    2452   86615  14533     98.4    0.784  !DANGEROUS LOAD-DO NOT USE!
+10.0  121    58.20   4055    2556   93498  14685     99.0    0.759  !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    110    52.91   3844    2297   77342  13853     99.3    0.825  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    110    52.91   3384    1780   52373  12776     86.9    0.983

 

[George Foster]

Thank You very much Dr. Mike

 

[George Foster]

TexasLife, I don't what you are measuring, when seat to 2.860 I have .266 from the base of the bullet to the mouth of the case.

 

[Aussie Wanderer]

I ran my 6mm Rem with the 70 Nosler BT’s and it was like a laser. The irony for me was that is shoots the 95 and 100 grain projectiles more accurately, the opposite of what brought the cartridge down originally. If only Remington had put the right twist on their barrels originally, a mighty fine cartridge wouldn’t be obsolete.

 

[George Foster]

Very True but remember the 90gr that Remington used was designed deer and such and in truth there wasn't much difference that bullet and the 100gr in the 243. I have always used the 75HP's and 100gr Spitz's in the 6mms of mine and I have always got better accuracy than I get with my 243's.