Ql Request

[George Foster]

Dr. Mike, it isn't my day, I need a QL for a 6mm, with 4064 not a 243,,

6mmRem
70 TNT HP Speer
Rem Case
IMR 4064
2.860 COL
24" Barrel

Thank You again!

 

[RiverRider]

I ain't Dr. Mike, but here ya go.

The Hodgdon load data website is working again, BTW. They list the load also.

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 0.445% 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

-04.4   94    43.00   3504    1909   55683  10675     98.9    1.007  ! Near Maximum !
-04.0   95    43.20   3519    1925   56441  10710     99.0    1.001  ! Near Maximum !
-03.6   95    43.40   3533    1940   57209  10744     99.1    0.995  ! Near Maximum !
-03.1   96    43.60   3548    1956   57987  10776     99.2    0.989  ! Near Maximum !
-02.7   96    43.80   3562    1972   58775  10808     99.3    0.983  ! Near Maximum !
-02.2   96    44.00   3577    1988   59574  10840     99.4    0.977  ! Near Maximum !
-01.8   97    44.20   3591    2005   60383  10870     99.5    0.971  ! Near Maximum !
-01.3   97    44.40   3606    2021   61202  10900     99.5    0.965  ! Near Maximum !
-00.9   98    44.60   3620    2037   62033  10928     99.6    0.959  ! Near Maximum !
-00.4   98    44.80   3634    2053   62875  10956     99.6    0.953  ! Near Maximum !
+00.0   99    45.00   3649    2069   63728  10983     99.7    0.948  ! Near Maximum !
+00.4   99    45.20   3663    2085   64592  11009     99.8    0.942  !DANGEROUS LOAD-DO NOT USE!
+00.9  100    45.40   3677    2102   65467  11034     99.8    0.936  !DANGEROUS LOAD-DO NOT USE!
+01.3  100    45.60   3691    2118   66355  11059     99.8    0.931  !DANGEROUS LOAD-DO NOT USE!
+01.8  100    45.80   3706    2134   67254  11082     99.9    0.925  !DANGEROUS LOAD-DO NOT USE!
+02.2  101    46.00   3720    2151   68165  11105     99.9    0.920  !DANGEROUS LOAD-DO NOT USE!

 

[TexasLife]

that oal seems long with a case of 2.220-2.225". i would think it should be around 2.740-2.800" for enough seating depth. how long is the projectile?

 

[RiverRider]

How much is "enough seating depth?"

 

[TexasLife]

How much is "enough seating depth?"

i'd say at least the full neck. from ql it's @ .170" which is half the neck length. that's for bearing surface only as i'm not sure if that bullet is flat based?

 

[RiverRider]

That's a pretty subjective judgement, but you're correct in that there must be "enough" shank in the case neck to keep the bullet where you want it. I'd say that depends on the activity and the rifle type. Some guys have told me that they load some bullets with only about 0.080" of shank in the neck and that works for their purposes. I sure wouldn't try it for AR15 ammo!

 

[TexasLife]

That's a pretty subjective judgement, but you're correct in that there must be "enough" shank in the case neck to keep the bullet where you want it. I'd say that depends on the activity and the rifle type. Some guys have told me that they load some bullets with only about 0.080" of shank in the neck and that works for their purposes. I sure wouldn't try it for AR15 ammo!

i might try something that shallow for a single shot, but not any auto loader for sure! repeater bolt guns not used as single shots i wouldn't try that way.

 

[trapper10]

Dr. Mike, it isn't my day, I need a QL for a 6mm, with 4064 not a 243,,

6mmRem
70 TNT HP Speer
Rem Case
IMR 4064
2.860 COL
24" Barrel

Thank You again!

Great varmint load. post the range results.

 

[assasinator]

Cartridge : 6 mm Rem.
Bullet : .243, 70, Speer HP TNT 1206
Useable Case Capaci: 51.969 grain H2O = 3.374 cm³
Cartridge O.A.L. L6: 2.825 inch = 71.76 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 3.0% 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

-30.0 70 31.50 2645 1088 25345 7657 86.5 1.404
-27.0 73 32.85 2750 1175 27912 8086 88.6 1.354
-24.0 76 34.20 2854 1266 30719 8501 90.6 1.306
-21.0 79 35.55 2957 1359 33788 8899 92.4 1.260
-18.0 82 36.90 3061 1456 37138 9277 94.0 1.216
-15.0 85 38.25 3163 1555 40794 9632 95.5 1.163
-12.0 88 39.60 3265 1657 44781 9960 96.7 1.113
-09.0 91 40.95 3366 1761 49132 10258 97.8 1.066
-06.0 93 42.30 3466 1868 53881 10524 98.7 1.022 ! Near Maximum !
-03.0 96 43.65 3565 1976 59067 10755 99.3 0.980 ! Near Maximum !
+00.0 99 45.00 3663 2085 64737 10948 99.7 0.941 !DANGEROUS LOAD-DO NOT USE!
+03.0 102 46.35 3759 2196 70943 11100 100.0 0.904 !DANGEROUS LOAD-DO NOT USE!
+06.0 105 47.70 3854 2308 77746 11215 100.0 0.869 !DANGEROUS LOAD-DO NOT USE!
+09.0 108 49.05 3947 2421 85216 11317 100.0 0.835 !DANGEROUS LOAD-DO NOT USE!
+12.0 111 50.40 4038 2535 93436 11411 100.0 0.803 !DANGEROUS LOAD-DO NOT USE!
+15.0 114 51.75 4129 2650 102503 11498 100.0 0.773 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 15% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 15% relative to nominal value:
+Ba 99 45.00 3840 2292 80531 10452 100.0 0.856 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 15% relative to nominal value:
-Ba 99 45.00 3364 1759 49020 10666 92.9 1.069


loads with bullet specific COAL.

 

[assasinator]

of course start with 10 percent below max and watch pressures. different cases matter. i use the best cases to avoid over pressures. norma, weatherby,etc cases. smith cases for my 460 smith mag, winchester for my 375 TAYLOr mag. remington for my 350 rem mag.

 

[assasinator]

even without freebore, pressures lower when you give even a small jump to the lands. it lowers accuracy, but also lower 'early' pressures. HOWEVER, shortening COAL raises compressive powder pressures. it is a balancing act and experience. BE CAREFUL PLEASE!

 

[300WSM]

i might try something that shallow for a single shot, but not any auto loader for sure! repeater bolt guns not used as single shots i wouldn't try that way.

Nor likely to fit in the internal mag if so desiring to tote around rounds, plural in the weapon.

 

[George Foster]

In my 6mm that I use the most I seat the 75 Sierra HP at 2.860 which is 0.30 off the lands. The Speer 70HP TNT is the same length as the Sierra 75HP so I don't feel I will have any problems with my bullet seating depths, and yes, they will fit in the magazine if I wish to do so. I use single shot adapters in my rifles as I use them for target shooting and varmint hunting.