The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

I'm about to start hand-loading for the 7.5x55mm Swiss round. Could somebody who has Quickload please do me a look-up for 7.5x55mm Swiss (may be called 7.5mm Schmidt-Rubin please.

Vihtavuori N140 with Hornady 178gr A-Max

TIA

OAL?

2.972"/75.5mm.

75,5mm is shorter than the CIP standard however here is what QL predicts:

Cartridge : 7.5 x 55 GP11 SWISS
Bullet : .308, 178, Hornady A-MAX 30712
Useable Case Capaci: 56.865 grain H2O = 3.692 cm³
Cartridge O.A.L. L6: 2.972 inch = 75.50 mm
Barrel Length : 21.0 inch = 533.4 mm
Powder : Vihtavuori N140

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.435% 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

-04.3 86 44.00 2427 2329 46101 8417 100.0 1.234
-03.9 86 44.20 2437 2346 46663 8439 100.0 1.227
-03.5 86 44.40 2446 2364 47231 8461 100.0 1.220 ! Near Maximum !
-03.0 87 44.60 2455 2382 47806 8483 100.0 1.213 ! Near Maximum !
-02.6 87 44.80 2464 2399 48387 8505 100.0 1.207 ! Near Maximum !
-02.2 88 45.00 2473 2417 48975 8527 100.0 1.200 ! Near Maximum !
-01.7 88 45.20 2482 2434 49569 8548 100.0 1.194 ! Near Maximum !
-01.3 88 45.40 2491 2452 50170 8570 100.0 1.187 ! Near Maximum !
-00.9 89 45.60 2500 2470 50778 8591 100.0 1.181 ! Near Maximum !
-00.4 89 45.80 2509 2488 51393 8613 100.0 1.174 ! Near Maximum !
+00.0 90 46.00 2518 2505 52015 8634 100.0 1.168 ! Near Maximum !
+00.4 90 46.20 2527 2523 52644 8656 100.0 1.162 ! Near Maximum !
+00.9 90 46.40 2536 2541 53280 8677 100.0 1.155 ! Near Maximum !
+01.3 91 46.60 2544 2559 53923 8698 100.0 1.149 ! Near Maximum !
+01.7 91 46.80 2553 2577 54574 8719 100.0 1.143 !DANGEROUS LOAD-DO NOT USE!
+02.2 91 47.00 2562 2594 55232 8740 100.0 1.137 !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 90 46.00 2592 2655 60897 8362 100.0 1.095 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 90 46.00 2406 2287 43141 8913 99.1 1.266

Thanks David, much appreciated.