Quick Load help for the Swede

[Aussie Wanderer]

Hi Guys,

I recently bought a Tikka T3 for my son in 6.5x55. It has a 22 inch barrel and shoots beautifully with the Hornady 129sst using Norma brass. He has two accuracy nodes, 1 at 48 grains of H4813sc and one at 49.5 grains of H4813sc. The cartridge is to the industry C.O.L. I ma just wondering how he is looking for pressure and possibly velocity too.

Many thanks
AW

 

[JD338]

That looks like a great combo for your son's 6.5 Swede.

JD338

 

[DrMike]

Cartridge : 6.5 x 55 Swedish
Bullet : .264, 129, Hornady SST InterLock 26202
Useable Case Capaci: 52.904 grain H2O = 3.435 cm³
Cartridge O.A.L. L6: 3.150 inch = 80.01 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4831 SC *T

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 90 44.55 2504 1796 39381 10706 89.4 1.337
-09.0 91 45.05 2534 1840 40695 10862 90.1 1.316
-08.0 92 45.54 2564 1883 42056 11016 90.7 1.295
-07.0 93 46.04 2594 1928 43467 11168 91.3 1.275
-06.0 94 46.53 2624 1973 44926 11316 91.8 1.255
-05.0 95 47.03 2655 2019 46442 11462 92.4 1.236
-04.0 96 47.52 2685 2065 48011 11605 92.9 1.216 ! Near Maximum !
-03.0 97 48.02 2715 2112 49638 11745 93.5 1.198 ! Near Maximum !
-02.0 98 48.51 2746 2160 51327 11882 94.0 1.179 ! Near Maximum !
-01.0 99 49.01 2776 2208 53078 12015 94.5 1.161 ! Near Maximum !
+00.0 100 49.50 2807 2257 54899 12145 94.9 1.143 !DANGEROUS LOAD-DO NOT USE!
+01.0 101 50.00 2838 2307 56787 12271 95.4 1.125 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 50.49 2869 2357 58748 12392 95.8 1.108 !DANGEROUS LOAD-DO NOT USE!
+03.0 103 50.99 2899 2408 60784 12510 96.2 1.091 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 51.48 2930 2459 62903 12624 96.6 1.074 !DANGEROUS LOAD-DO NOT USE!
+05.0 105 51.98 2961 2511 65106 12733 97.0 1.057 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 100 49.50 2889 2390 60355 12303 97.5 1.097 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 49.50 2715 2112 49754 11842 91.4 1.195 ! Near Maximum !

 

[DrMike]

Cartridge : 6.5 x 55 Swedish
Bullet : .264, 129, Hornady SST InterLock 26202
Useable Case Capaci: 52.904 grain H2O = 3.435 cm³
Cartridge O.A.L. L6: 3.150 inch = 80.01 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4831 SC *T

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 88 43.20 2423 1682 36020 10270 87.7 1.392
-09.0 89 43.68 2452 1722 37179 10426 88.3 1.374
-08.0 90 44.16 2481 1763 38378 10581 88.9 1.353
-07.0 91 44.64 2510 1804 39617 10734 89.6 1.333
-06.0 92 45.12 2539 1846 40898 10886 90.2 1.313
-05.0 92 45.60 2568 1889 42225 11035 90.7 1.293
-04.0 93 46.08 2597 1932 43597 11181 91.3 1.273
-03.0 94 46.56 2626 1976 45017 11325 91.9 1.254
-02.0 95 47.04 2656 2020 46488 11467 92.4 1.235
-01.0 96 47.52 2685 2065 48011 11605 92.9 1.216 ! Near Maximum !
+00.0 97 48.00 2715 2111 49589 11741 93.5 1.198 ! Near Maximum !
+01.0 98 48.48 2744 2157 51223 11874 93.9 1.180 ! Near Maximum !
+02.0 99 48.96 2774 2204 52917 12003 94.4 1.163 ! Near Maximum !
+03.0 100 49.44 2803 2251 54674 12129 94.9 1.145 !DANGEROUS LOAD-DO NOT USE!
+04.0 101 49.92 2833 2299 56495 12252 95.3 1.128 !DANGEROUS LOAD-DO NOT USE!
+05.0 102 50.40 2863 2348 58385 12371 95.8 1.111 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba 97 48.00 2797 2241 54474 11959 96.4 1.150 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba 97 48.00 2623 1970 44995 11388 89.6 1.253

 

[Aussie Wanderer]

Thanks Dr Mike. Looks like that 48 grain load will be the one. No apparent bolt lift issues or primer issues as the loads went up. in fact the primers looked the same as he worked up from 45 grains in half grain increments. The confidence he now has in this rifle will be something he carries into the field. It feels a little nostalgic, my first centrefire as a young man was a sporterised m96 Swede. Was a good old gun that took a lot of game.

 

[DrMike]

The Swede is a great cartridge that'll get 'er done.

 

[Aussie Wanderer]

An update on this load as well through the chronograph was 48 grains of H4813sc behind a 129sst was running at an average of 2,705fps. More than adequate for the distances we shoot.

 

[wbm43]

FWIW: Hodgdon lists 45000 CUP with a 129gr Hornady SP at their recommended "Max" load of 48.5gr H4831....they used a 24" barrel with Winchester primers and brass.