6.5x55

[sako2]

QL request for the 6.5x55 using 6.5 stabal with a hornady 140gn bthp #26335. I charged some with hodgdon's starting load for a 140gn bullet Did i start to low. Thank you. It was built on a interarms actiun.

 

[jimbires]

here you go . 47.4 looks to be a max load . I'd start at 43 and work up .

Cartridge          : 6.5 x 55 Swedish
Bullet             : .264, 140, Hornady BTHP 26335
Useable Case Capaci: 52.334 grain H2O = 3.398 cm³
Cartridge O.A.L. L6: 3.150 inch = 80.01 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Winchester 6,5 StaBall *T*C

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   73    37.92   2224    1537   29582   8025     98.0    1.640
-18.0   75    38.87   2274    1608   31482   8216     98.6    1.601
-16.0   77    39.82   2324    1679   33491   8394     99.1    1.564
-14.0   79    40.76   2374    1752   35626   8557     99.5    1.527
-12.0   80    41.71   2423    1825   37896   8705     99.8    1.487
-10.0   82    42.66   2472    1900   40311   8838    100.0    1.445
-08.0   84    43.61   2521    1975   42882   8953    100.0    1.404
-06.0   86    44.56   2569    2051   45618   9060    100.0    1.365
-04.0   88    45.50   2616    2128   48535   9165    100.0    1.327  ! Near Maximum !
-02.0   89    46.45   2663    2205   51643   9268    100.0    1.291  ! Near Maximum !
+00.0   91    47.40   2710    2283   54961   9368    100.0    1.256  !DANGEROUS LOAD-DO NOT USE!
+02.0   93    48.35   2756    2362   58503   9465    100.0    1.223  !DANGEROUS LOAD-DO NOT USE!
+04.0   95    49.30   2803    2442   62278   9560    100.0    1.190  !DANGEROUS LOAD-DO NOT USE!
+06.0   97    50.24   2848    2522   66288   9652    100.0    1.159  !DANGEROUS LOAD-DO NOT USE!
+08.0   99    51.19   2894    2604   70562   9741    100.0    1.128  !DANGEROUS LOAD-DO NOT USE!
+10.0  100    52.14   2939    2686   75128   9827    100.0    1.099  !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     91    47.40   2793    2424   65376   9086    100.0    1.175  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     91    47.40   2585    2077   45121   9700     99.4    1.364

 

[sako2]

Thank you Jim.

 

[wvbuckbuster]

In my Win Mod 70 Fwt 6.5x55 best group using Win SB6.5 was 46.0grs with the Hornady 140SST gave 2684fps. 46.5grs with same bullet gave 2731fps in my Tikka.
Dan