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
Quickload - Help request please ... ...
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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Re: Quickload - Help request please ... ...
OAL?
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Re: Quickload - Help request please ... ...
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
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
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