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 Post subject: 6mm BR QL Please
PostPosted: Mon May 03, 2021 5:22 pm 

Joined: Wed Nov 28, 2018 8:39 am
Posts: 332
Location: SW Montana
Looking for some QL data for
6mm BR Norma
26" barrel
Accurate LT-32 powder and H4895
70gr Nosler Ballistic Tip

thanks kindly


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 Post subject: Re: 6mm BR QL Please
PostPosted: Mon May 03, 2021 8:00 pm 

Joined: Wed Nov 08, 2006 2:49 pm
Posts: 33632
Location: Northern British Columbia
You didn't suggest your OAL. I chose 2.200 inches.

Code:
Cartridge          : 6 mm B.R. Norma
Bullet             : .243, 70, Nosler BalTip 39532
Useable Case Capaci: 34.865 grain H2O = 2.264 cm³
Cartridge O.A.L. L6: 2.200 inch = 55.88 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : Hodgdon H4895

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   92    29.70   3110    1504   41594   6944     93.8    1.196
-09.0   93    30.03   3144    1536   42968   7022     94.3    1.178
-08.0   94    30.36   3177    1569   44389   7099     94.7    1.161
-07.0   95    30.69   3210    1602   45858   7173     95.2    1.145
-06.0   97    31.02   3244    1635   47377   7245     95.6    1.128
-05.0   98    31.35   3277    1669   48947   7314     96.0    1.112
-04.0   99    31.68   3310    1703   50571   7382     96.4    1.096  ! Near Maximum !
-03.0  100    32.01   3343    1737   52251   7447     96.8    1.081  ! Near Maximum !
-02.0  101    32.34   3376    1772   53988   7509     97.1    1.066  ! Near Maximum !
-01.0  102    32.67   3409    1807   55786   7569     97.4    1.051  ! Near Maximum !
+00.0  103    33.00   3442    1842   57647   7626     97.8    1.036  ! Near Maximum !
+01.0  104    33.33   3475    1877   59573   7680     98.0    1.022  !DANGEROUS LOAD-DO NOT USE!
+02.0  105    33.66   3508    1913   61567   7732     98.3    1.007  !DANGEROUS LOAD-DO NOT USE!
+03.0  106    33.99   3541    1949   63633   7780     98.6    0.993  !DANGEROUS LOAD-DO NOT USE!
+04.0  107    34.32   3574    1985   65772   7826     98.8    0.980  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    34.65   3606    2021   67989   7869     99.0    0.966  !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    103    33.00   3598    2012   68752   7495    100.0    0.963  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    33.00   3234    1625   46965   7394     91.7    1.131


I don't have data for Accurate LT-32.

_________________
Fortiorum fortia facta


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 Post subject: Re: 6mm BR QL Please
PostPosted: Tue May 04, 2021 4:52 am 

Joined: Wed Nov 28, 2018 8:39 am
Posts: 332
Location: SW Montana
Thanks Mike! 2.2 OAL works fine for now until I get everything put together.
I can't wait to get home and start messing with it. I just hope my daughter is as excited as I am :)


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