6mm 85HPBT

[George Foster]

I would like to ask Dr. Mike or others for a favor, I would like to have QL report for the following:

6mm Rem
85HPBT Sierra
RL19 Powder
Rem Case
Fed 210M Primer
24" Barrel
2.825 COL

Thank You in advance.

 

[DrMike]

Cartridge          : 6 mm Rem.  (SAAMI)
Bullet             : .243, 85, Sierra HPBT 1530
Useable Case Capaci: 50.748 grain H2O = 3.295 cm³
Cartridge O.A.L. L6: 2.825 inch = 71.76 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   96    44.73   3089    1801   45220  11188     92.9    1.188
-09.0   97    45.23   3125    1843   46790  11330     93.4    1.170
-08.0   98    45.72   3161    1885   48418  11468     94.0    1.151
-07.0   99    46.22   3197    1929   50106  11603     94.5    1.133
-06.0  100    46.72   3233    1972   51856  11734     95.0    1.115
-05.0  101    47.22   3269    2017   53672  11861     95.5    1.098
-04.0  102    47.71   3305    2062   55557  11983     96.0    1.081  ! Near Maximum !
-03.0  103    48.21   3341    2107   57514  12101     96.4    1.064  ! Near Maximum !
-02.0  104    48.71   3377    2153   59542  12214     96.8    1.048  ! Near Maximum !
-01.0  105    49.20   3413    2199   61654  12323     97.2    1.032  ! Near Maximum !
+00.0  106    49.70   3449    2246   63844  12426     97.6    1.016  ! Near Maximum !
+01.0  107    50.20   3485    2293   66122  12524     97.9    1.000  !DANGEROUS LOAD-DO NOT USE!
+02.0  108    50.69   3521    2340   68479  12617     98.2    0.985  !DANGEROUS LOAD-DO NOT USE!
+03.0  109    51.19   3557    2389   70920  12704     98.5    0.970  !DANGEROUS LOAD-DO NOT USE!
+04.0  110    51.69   3593    2437   73453  12786     98.8    0.955  !DANGEROUS LOAD-DO NOT USE!
+05.0  112    52.19   3629    2486   76086  12862     99.0    0.940  !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    106    49.70   3617    2470   76452  12301    100.0    0.941  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    106    49.70   3227    1965   52001  11913     91.0    1.113

That'll be stepping out there!

 

[George Foster]

Thank You Dr. Mike! Looks like the load has potential.

 

[mjcmichigan]

George, I have a 243win, and used that same bullet you are, SGK 85gn HPBT.

Used pixie dust(aka RL26). Chrono’d at 3350fps.

Shot 6 does with it. Several flipped over on the spot. 5 had no exit wound, but were DRT or moved less than 20 yards. The one with the exit hold made it 45 yards before collapsing.

With the 6mm REM, you’ll be really happy.


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[George Foster]

Thank You for the info.

 

[DrMike]

Thank You Dr. Mike! Looks like the load has potential.

I'd be inclined to give it serious consideration, for sure.

 

[ShadeTree]

George, not what you asked but just to add a good alternative with that bullet in a 6mm. I've ran 47.5 gr of IMR 4831 with the sierra 85hpbt through a couple different 6mm's with very good results.

Stays under an inch in a 18" model 7 and averages 3080fps. If I run that bullet close to the lands it shoots tiny little clusters but I don't like using hunting loads close to the lands.

In an old 22" Rem 760 it averaged better than that staying at 3/4" and I believe in that rifle ran close to 3200. Stellar load both on paper and in the field.

 

[Thebear_78]

I’ve used that bullet on a few white tails out of my 243. It proved to be very accurate and very effective.


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[George Foster]

Actually over the years I have had a "Pet Load" of 46.5gr IMR4831 with the 85HPBT. Three shot groups have went as small as 0.25 and five shot groups the largest group I ever shot was 0.875. I now prefer using RL19 over other powders for the loads I use in the 6mm's.