270 Win W/IMR8208XBR

[mike06]

Just wondering if anyone has tried IMR 8208 in their 270 Win. I have a Nosler Win 270 M 48 and thinking about trying some with Nosler 130 BT and Accubonds. I have had good results with 8208 in my AR's and 308's. Found some quickload data here in the forum.

 

[SJB358]

Just wondering if anyone has tried IMR 8208 in their 270 Win. I have a Nosler Win 270 M 48 and thinking about trying some with Nosler 130 BT and Accubonds. I have had good results with 8208 in my AR's and 308's. Found some quickload data here in the forum.

It's a pretty fast powder for the 270, but 4064 was used for a bunch of 130's back in the day. I wouldn't expect screaming speeds but I'd bet they will be good.

 

[FOTIS]

Like Scott said a little too fast

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 130, Nosler BalTip 27130
Useable Case Capaci: 60.839 grain H2O = 3.950 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : IMR 8208 XBR

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0   64    36.00   2440    1719   29962   7225     97.1    1.586
-18.0   66    36.90   2491    1791   31652   7400     97.8    1.552
-16.0   67    37.80   2541    1864   33423   7567     98.3    1.518
-14.0   69    38.70   2591    1937   35276   7725     98.8    1.487
-12.0   71    39.60   2640    2012   37216   7874     99.2    1.456
-10.0   72    40.50   2688    2086   39245   8014     99.5    1.419
-08.0   74    41.40   2737    2162   41369   8144     99.7    1.384
-06.0   75    42.30   2784    2237   43590   8265     99.9    1.350
-04.0   77    43.20   2831    2314   45913   8374    100.0    1.318
-02.0   79    44.10   2877    2390   48342   8474    100.0    1.287
+00.0   80    45.00   2923    2467   50883   8570    100.0    1.257
+02.0   82    45.90   2968    2543   53541   8664    100.0    1.229
+04.0   83    46.80   3013    2621   56322   8757    100.0    1.201  ! Near Maximum !
+06.0   85    47.70   3057    2698   59230   8849    100.0    1.174  ! Near Maximum !
+08.0   87    48.60   3101    2776   62274   8939    100.0    1.149  ! Near Maximum !
+10.0   88    49.50   3144    2854   65460   9027    100.0    1.124  !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     80    45.00   3008    2611   58641   8307    100.0    1.183  ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba     80    45.00   2797    2258   43068   8754     98.5    1.356