Quick Load 6mm

George Foster · Mar 21, 2023

Dr. Mike,

Could I ask for you to run a quickoad once again for me.

6mm Rem
70HP TNT Speer
Rem Case
24"Barrel
2.820COL
RL 19

6mm Rem
70HP TNT Speer
Rem Case
24"Barrel
2.820COL
IMR4831

Thank You in advance.
George

DrMike · Mar 21, 2023

Code:

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 51.905 grain H2O = 3.370 cm³
Cartridge O.A.L. L6: 2.820 inch = 71.63 mm
Barrel Length      : 24.0 inch = 609.6 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   99    47.34   3316    1710   44835  10965     89.8    1.107
-09.0  100    47.87   3357    1751   46437  11117     90.5    1.089
-08.0  101    48.39   3397    1794   48132  11266     91.2    1.071
-07.0  102    48.92   3438    1837   49881  11411     91.9    1.053
-06.0  103    49.44   3479    1881   51695  11553     92.5    1.036
-05.0  104    49.97   3519    1925   53585  11690     93.1    1.020
-04.0  106    50.50   3560    1970   55549  11824     93.7    1.003  ! Near Maximum !
-03.0  107    51.02   3601    2016   57594  11952     94.2    0.987  ! Near Maximum !
-02.0  108    51.55   3642    2062   59717  12077     94.8    0.971  ! Near Maximum !
-01.0  109    52.07   3683    2109   61937  12196     95.3    0.955  ! Near Maximum !
+00.0  110    52.60   3724    2156   64249  12311     95.8    0.940  ! Near Maximum !
+01.0  111    53.13   3765    2204   66654  12420     96.3    0.925  !DANGEROUS LOAD-DO NOT USE!
+02.0  112    53.65   3807    2252   69165  12524     96.7    0.910  !DANGEROUS LOAD-DO NOT USE!
+03.0  113    54.18   3848    2301   71784  12622     97.1    0.895  !DANGEROUS LOAD-DO NOT USE!
+04.0  114    54.70   3889    2351   74516  12714     97.5    0.881  !DANGEROUS LOAD-DO NOT USE!
+05.0  115    55.23   3930    2401   77369  12800     97.9    0.866  !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    110    52.60   3832    2282   70768  12429     98.2    0.902  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    110    52.60   3603    2018   58122  12037     92.4    0.983  ! Near Maximum !

Well, that bullet is stepping out there. No doubt that'll put a hurt on a prairie poodle.

DrMike · Mar 21, 2023

Code:

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 51.905 grain H2O = 3.370 cm³
Cartridge O.A.L. L6: 2.820 inch = 71.63 mm
Barrel Length      : 24.0 inch = 609.6 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   99    45.45   3324    1717   44921  10797     96.0    1.124
-09.0  100    45.96   3362    1757   46543  10910     96.5    1.106
-08.0  101    46.46   3401    1797   48224  11018     96.9    1.088
-07.0  103    46.97   3439    1838   49967  11121     97.4    1.070
-06.0  104    47.47   3477    1879   51774  11219     97.7    1.053
-05.0  105    47.98   3515    1921   53648  11311     98.1    1.036
-04.0  106    48.48   3554    1963   55592  11398     98.4    1.020  ! Near Maximum !
-03.0  107    48.99   3592    2005   57609  11478     98.7    1.003  ! Near Maximum !
-02.0  108    49.49   3629    2048   59702  11553     99.0    0.987  ! Near Maximum !
-01.0  109    50.00   3667    2090   61875  11622     99.2    0.972  ! Near Maximum !
+00.0  110    50.50   3705    2134   64130  11685     99.4    0.956  ! Near Maximum !
+01.0  111    51.01   3743    2177   66472  11741     99.6    0.941  !DANGEROUS LOAD-DO NOT USE!
+02.0  112    51.51   3780    2221   68905  11790     99.8    0.927  !DANGEROUS LOAD-DO NOT USE!
+03.0  114    52.02   3817    2265   71434  11833     99.9    0.912  !DANGEROUS LOAD-DO NOT USE!
+04.0  115    52.52   3854    2309   74062  11869     99.9    0.898  !DANGEROUS LOAD-DO NOT USE!
+05.0  116    53.03   3891    2354   76795  11898    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    110    50.50   3796    2240   70787  11501    100.0    0.917  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    110    50.50   3596    2010   57568  11696     97.6    1.002  ! Near Maximum !

This is another one that is stepping right along.

George Foster · Mar 21, 2023

Thank You very much Dr. Mike, now may I ask a question of you. I have QL's for these powders with Sierra 75HP's do you feel there would be much of a difference if I substituted Speer 75HP's for the Sierras?

DrMike · Mar 21, 2023

I wouldn't imagine there would be a serious difference, though there is a difference. I imagine the difference is due to differences in bearing surface and possibly metal composition. This does appear to be a difference of ~2K psi maximum chamber pressure. Lee manuals tend to focus solely on bullet weight, so there is some precedence for taking that approach. It doesn't hurt to verify safety, however, dropping back by 5% or so and working up.

George Foster · Mar 22, 2023

Dr Mike,

Could I ask you to run the QL's for me using the Speer bullet.

6mm Rem
75HP Speer
Rem Case
24"Barrel
2.820COL
RL 19

6mm Rem
75HP Speer
Rem Case
24"Barrel
2.820COL
IMR4831

Thank You in advance.
George

DrMike · Mar 22, 2023

Code:

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 75, Speer HP 1205
Useable Case Capaci: 51.846 grain H2O = 3.366 cm³
Cartridge O.A.L. L6: 2.820 inch = 71.63 mm
Barrel Length      : 24.0 inch = 609.6 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   98    44.73   3242    1750   45207  10890     96.8    1.151
-09.0   99    45.23   3278    1790   46805  10998     97.2    1.133
-08.0  100    45.72   3315    1830   48460  11102     97.6    1.115
-07.0  101    46.22   3351    1871   50174  11200     98.0    1.097
-06.0  102    46.72   3388    1911   51949  11294     98.3    1.080
-05.0  103    47.22   3424    1953   53788  11381     98.6    1.063
-04.0  104    47.71   3461    1994   55693  11463     98.9    1.046  ! Near Maximum !
-03.0  105    48.21   3497    2036   57667  11539     99.2    1.030  ! Near Maximum !
-02.0  106    48.71   3533    2079   59713  11609     99.4    1.014  ! Near Maximum !
-01.0  108    49.20   3569    2121   61835  11674     99.6    0.998  ! Near Maximum !
+00.0  109    49.70   3605    2164   64034  11732     99.7    0.983  ! Near Maximum !
+01.0  110    50.20   3640    2207   66315  11783     99.8    0.967  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    50.69   3676    2250   68681  11828     99.9    0.952  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    51.19   3711    2293   71137  11867    100.0    0.938  !DANGEROUS LOAD-DO NOT USE!
+04.0  113    51.69   3746    2337   73686  11899    100.0    0.923  !DANGEROUS LOAD-DO NOT USE!
+05.0  114    52.19   3781    2381   76333  11926    100.0    0.909  !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    109    49.70   3689    2266   70565  11512    100.0    0.942  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    109    49.70   3503    2043   57580  11789     98.2    1.029  ! Near Maximum !

DrMike · Mar 22, 2023

Code:

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 75, Speer HP 1205
Useable Case Capaci: 51.846 grain H2O = 3.366 cm³
Cartridge O.A.L. L6: 2.820 inch = 71.63 mm
Barrel Length      : 24.0 inch = 609.6 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   98    46.62   3238    1746   44973  11137     91.0    1.134
-09.0   99    47.14   3277    1788   46566  11286     91.7    1.116
-08.0  100    47.66   3316    1831   48227  11433     92.3    1.098
-07.0  101    48.17   3355    1874   49951  11575     92.9    1.080
-06.0  102    48.69   3394    1918   51739  11714     93.5    1.063
-05.0  103    49.21   3433    1962   53598  11849     94.0    1.046
-04.0  104    49.73   3472    2007   55529  11979     94.6    1.029  ! Near Maximum !
-03.0  105    50.25   3511    2053   57535  12105     95.1    1.013  ! Near Maximum !
-02.0  106    50.76   3550    2099   59624  12227     95.6    0.997  ! Near Maximum !
-01.0  107    51.28   3589    2146   61794  12343     96.1    0.981  ! Near Maximum !
+00.0  108    51.80   3629    2193   64056  12454     96.5    0.966  ! Near Maximum !
+01.0  109    52.32   3668    2240   66409  12561     96.9    0.950  !DANGEROUS LOAD-DO NOT USE!
+02.0  111    52.84   3707    2289   68858  12661     97.3    0.935  !DANGEROUS LOAD-DO NOT USE!
+03.0  112    53.35   3746    2337   71411  12756     97.7    0.920  !DANGEROUS LOAD-DO NOT USE!
+04.0  113    53.87   3786    2387   74072  12846     98.0    0.906  !DANGEROUS LOAD-DO NOT USE!
+05.0  114    54.39   3825    2436   76844  12929     98.4    0.892  !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    108    51.80   3730    2317   70499  12536     98.6    0.927  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    108    51.80   3513    2056   57936  12215     93.4    1.009  ! Near Maximum !

George Foster · Mar 22, 2023

Dr. Mike,

Thank You very much and I am sorry for bothering you, the 75 Speer Quickload is the same as the ones for the Sierra 75HP. I just wanted to be on the safe side before I started working with the Speer's.

Thank You again!
George