Few ?

[TackDriver284]

That is some great shooting with the 41.8 grain load of Varget. I checked the load on QL and its right at the node. If you were to weigh an unsized / fired brass and again with a fired brass with H20, make sure water is filled flat on top, subtract the difference and I can run that data on QL and your COAL length you used in that load for more accurate information. A little tweaking on OAL might do the trick to shrink it even more.

 

[Michael C. Smith]

That is some great shooting with the 41.8 grain load of Varget. I checked the load on QL and its right at the node. If you were to weigh an unsized / fired brass and again with a fired brass with H20, make sure water is filled flat on top, subtract the difference and I can run that data on QL and your COAL length you used in that load for more accurate information. A little tweaking on OAL might do the trick to shrink it even more.

Heading out of town for the weekend but love to see that data I will get you that info on Sunday. Thank you!

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[Michael C. Smith]

That is some great shooting with the 41.8 grain load of Varget. I checked the load on QL and its right at the node. If you were to weigh an unsized / fired brass and again with a fired brass with H20, make sure water is filled flat on top, subtract the difference and I can run that data on QL and your COAL length you used in that load for more accurate information. A little tweaking on OAL might do the trick to shrink it even more.

Here you go Tackdriver284.

I am using Hornady brass fed 210 primers. The fired brass from the 41.8 load weighed 161.7 fired filled withe water it weighed 217.7. Which equals 56 grains.

41.8 grains varget
Fed 210
Hornady brass
140 AccuBond
Coal 2.800
Average vel.2700 fps on 3 shots

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[TackDriver284]

I crunched the data into QL, it is very close to the node # 5 of 1.0257 with the 20 inch barrel, since you ran 41.8 grains and it will need 42.2 grains to hit the node, only .4 grains off. You should get 2725 fps more or less at the node. The air temp is 70 degrees, so I believe it may be cooler than that where you are at. It won't hurt to try in .2 increments to get to 42.2 grains. Just keep an eye on pressure signs. You may shrink it a little more even with .4 grains more. I would give it a try, its up to you. How was your primers on your 41.8 grain load? Any hard bolt lift? You can try to play with seating depth if you wish to stay at 42.8 grains.

Cartridge : 7 mm-08 Rem.
Bullet : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 47.791 grain H2O = 3.103 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.11 mm
Barrel Length : 20.0 inch = 508.0 mm
Powder : Hodgdon VARGET ?, Temperature: 70 °F

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    37.98   2470    1896   43197   9193     95.9    1.176
-09.0   90    38.40   2495    1935   44506   9298     96.3    1.159
-08.0   91    38.82   2521    1975   45852   9400     96.7    1.143
-07.0   92    39.25   2546    2016   47239   9500     97.0    1.127
-06.0   93    39.67   2572    2056   48667   9598     97.3    1.112
-05.0   94    40.09   2597    2097   50137   9692     97.6    1.097
-04.0   95    40.51   2623    2138   51651   9784     97.9    1.082  ! Near Maximum !
-03.0   96    40.93   2648    2180   53211   9874     98.2    1.067  ! Near Maximum !
-02.0   97    41.36   2674    2222   54818   9960     98.4    1.053  ! Near Maximum !
-01.0   98    41.78   2699    2264   56473  10044     98.7    1.038  ! Near Maximum !
+00.0   99    42.20   2724    2307   58179  10124     98.9    1.024  ! Near Maximum !
+01.0  100    42.62   2749    2350   59937  10201     99.1    1.011  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    43.04   2775    2393   61749  10275     99.2    0.997  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    43.47   2800    2437   63617  10346     99.4    0.984  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    43.89   2825    2480   65543  10413     99.5    0.971  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    44.31   2850    2524   67530  10477     99.7    0.958  !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     99    42.20   2831    2492   67938   9898    100.0    0.959  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    42.20   2578    2066   48601   9905     94.0    1.110