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260rem RS62 142gr smks


No i deer

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16 hours ago, PaulC said:

46.2 grains N165 does the trick and Exellent barrel life !!!

The shooter has RS62 to try Paul.no data for the 260 on RS site.you have the luxury of the 30 inch barrel to get velocity with N165.

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Cartridge          : .260 Rem
Bullet             : .264, 142, Sierra HPBT MatchK 1742
Useable Case Capaci: 45.662 grain H2O = 2.965 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 26.0 inch = 660.4 mm
Powder             : ReloadSwiss RS 62

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   74    32.80   2158    1468   25522   6909     92.5    1.830
-18.0   76    33.62   2211    1541   27178   7116     93.6    1.786
-16.0   78    34.44   2263    1615   28948   7315     94.7    1.743
-14.0   80    35.26   2316    1691   30837   7504     95.6    1.701
-12.0   82    36.08   2368    1768   32855   7684     96.5    1.660
-10.0   84    36.90   2421    1847   35011   7853     97.3    1.621
-08.0   86    37.72   2473    1928   37318   8010     98.0    1.579
-06.0   87    38.54   2524    2009   39785   8155     98.5    1.534
-04.0   89    39.36   2576    2092   42401   8287     99.0    1.490
-02.0   91    40.18   2627    2176   45169   8406     99.4    1.448
+00.0   93    41.00   2678    2261   48113   8510     99.7    1.408
+02.0   95    41.82   2728    2347   51253   8600     99.9    1.369  ! Near Maximum !
+04.0   97    42.64   2779    2434   54601   8675    100.0    1.331  ! Near Maximum !
+06.0   99    43.46   2828    2522   58174   8736    100.0    1.295  ! Near Maximum !
+08.0  100    44.28   2877    2610   61990   8792    100.0    1.260  !DANGEROUS LOAD-DO NOT USE!
+10.0  102    45.10   2926    2699   66069   8847    100.0    1.226  !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     93    41.00   2795    2463   58839   8131    100.0    1.299  ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba     93    41.00   2507    1982   37991   8482     95.1    1.552
 

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I tested 43gr of RS62 with a 139gr Scenar yesterday, it wasn't a great day for it, but I saw minimal vertical dispersion, just a bit of left-right in yesterdays gales up here.

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On 17/03/2018 at 1:54 PM, No i deer said:

Thank you sir.very decent of you :D

Please bear in mind that is with a 26" barrel.

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