Load Specifications
Bullet:.308 | 180gr | Hornady GMX
Bullet Manufacturer:Hornady
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:7.5 x 55 Swiss load data
Case Length (l3):2.188"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:65 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:31"
Max. allowed Pressure:55,114 psi
Recommended Twist Rate:1:10.5
Load data in caliber 7.5 x 55 Swiss with .308 | 180gr | Hornady GMX bullet and 98 powders. The key underlying parameters are shown in the table above.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 47,369 psi | 86% | 2543 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 48,472 psi | 88% | 2608 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 47,065 psi | 85% | 2598 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 49,806 psi | 90% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 48,428 psi | 88% | 2592 fps | 96.2% |
| Accurate 4064 | <<locked>> | 92% | 47,253 psi | 86% | 2644 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,064 psi | 84% | 2710 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 88% | 49,400 psi | 90% | 2680 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 47,326 psi | 86% | 2631 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 48,791 psi | 89% | 2635 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 48,225 psi | 88% | 2608 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 48,341 psi | 88% | 2782 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 49,588 psi | 90% | 2697 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 47,297 psi | 86% | 2671 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,079 psi | 84% | 2720 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 49,676 psi | 90% | 2808 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,184 psi | 58% | 2467 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 35,172 psi | 64% | 2595 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 48,950 psi | 89% | 2694 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 49,327 psi | 90% | 2707 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 47,398 psi | 86% | 2625 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 47,921 psi | 87% | 2575 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 47,311 psi | 86% | 2667 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 48,588 psi | 88% | 2749 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 49,269 psi | 89% | 2628 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 47,659 psi | 86% | 2671 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,719 psi | 90% | 2759 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 96% | 48,167 psi | 87% | 2677 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 88% | 49,806 psi | 90% | 2690 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,177 psi | 77% | 2605 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 48,211 psi | 87% | 2717 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 47,616 psi | 86% | 2740 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,708 psi | 63% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 48,225 psi | 88% | 2648 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 48,892 psi | 89% | 2667 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 49,792 psi | 90% | 2657 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,398 psi | 86% | 2592 fps | 96.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 47,355 psi | 86% | 2651 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,588 psi | 90% | 2661 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,888 psi | 80% | 2654 fps | 99% |
| IMR 4895 | <<locked>> | 90% | 48,457 psi | 88% | 2700 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 48,791 psi | 89% | 2635 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 48,269 psi | 88% | 2618 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 48,022 psi | 87% | 2654 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 49,777 psi | 90% | 2612 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 49,124 psi | 89% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 48,182 psi | 87% | 2651 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,588 psi | 88% | 2680 fps | 97.6% |
| Norma 201 | <<locked>> | 88% | 48,254 psi | 88% | 2628 fps | 100% |
| Norma 202 | <<locked>> | 88% | 48,588 psi | 88% | 2631 fps | 100% |
| Norma 203B | <<locked>> | 92% | 49,313 psi | 89% | 2703 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 46,035 psi | 84% | 2703 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 92% | 49,690 psi | 90% | 2730 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,353 psi | 82% | 2697 fps | 97.7% |
| Ramshot TAC | <<locked>> | 86% | 49,023 psi | 89% | 2651 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 48,153 psi | 87% | 2671 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 49,806 psi | 90% | 2638 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,940 psi | 63% | 1650 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 48,240 psi | 88% | 2615 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,631 psi | 88% | 2657 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 46,557 psi | 84% | 2726 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 49,719 psi | 90% | 2812 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,876 psi | 83% | 2733 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,934 psi | 85% | 2756 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 86% | 49,139 psi | 89% | 2608 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 48,530 psi | 88% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 49,211 psi | 89% | 2697 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 47,398 psi | 86% | 2625 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,182 psi | 87% | 2651 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 48,022 psi | 87% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 49,124 psi | 89% | 2654 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,588 psi | 88% | 2680 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 47,892 psi | 87% | 2713 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,905 psi | 85% | 2625 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 47,834 psi | 87% | 2654 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 47,195 psi | 86% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 49,864 psi | 90% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,515 psi | 88% | 2605 fps | 97.2% |
| Somchem S321 | <<locked>> | 84% | 49,617 psi | 90% | 2671 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 49,530 psi | 90% | 2572 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 46,528 psi | 84% | 2618 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 46,949 psi | 85% | 2651 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,973 psi | 74% | 2657 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 47,384 psi | 86% | 2500 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 47,311 psi | 86% | 2516 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 47,805 psi | 87% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 49,023 psi | 89% | 2612 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 48,298 psi | 88% | 2635 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,849 psi | 89% | 2703 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 49,153 psi | 89% | 2635 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 47,123 psi | 86% | 2612 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,572 psi | 86% | 2707 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 33,939 psi | 62% | 2536 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 46,514 psi | 84% | 2638 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 48,283 psi | 88% | 2680 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 46,804 psi | 85% | 2713 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 28,427 psi | 52% | 2434 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 47,108 psi | 85% | 2657 fps | 99.9% |
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 41,640 psi | 76% | 2457 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,063 psi | 82% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,591 psi | 61% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,393 psi | 73% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 45,368 psi | 82% | 2546 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 31,792 psi | 58% | 2372 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 29,979 psi | 54% | 2395 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 38,305 psi | 70% | 2487 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 32,503 psi | 59% | 2346 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,350 psi | 73% | 2497 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 39,436 psi | 72% | 2484 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 34,360 psi | 62% | 2503 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,430 psi | 57% | 2362 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,142 psi | 62% | 2425 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 31,894 psi | 58% | 2418 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 27,267 psi | 49% | 2326 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 26,760 psi | 49% | 2316 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 32,924 psi | 60% | 2536 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,275 psi | 68% | 2490 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 30,632 psi | 56% | 2362 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 41,858 psi | 76% | 2530 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,409 psi | 77% | 2487 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,261 psi | 69% | 2513 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,221 psi | 77% | 2641 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 45,992 psi | 83% | 2582 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 31,821 psi | 58% | 2362 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 40,814 psi | 74% | 2605 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 45,136 psi | 82% | 2625 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,566 psi | 70% | 2497 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 26,963 psi | 49% | 2264 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,403 psi | 62% | 2467 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 44,266 psi | 80% | 2680 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,715 psi | 47% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,289 psi | 68% | 2457 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 37,652 psi | 68% | 2493 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,055 psi | 62% | 2375 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 41,698 psi | 76% | 2490 fps | 95.6% |
| IMR 4350 | <<locked>> | 96% | 41,611 psi | 76% | 2549 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 41,205 psi | 75% | 2516 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 29,602 psi | 54% | 2359 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 34,940 psi | 63% | 2454 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,350 psi | 73% | 2497 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 44,860 psi | 81% | 2566 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 36,535 psi | 66% | 2464 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 38,972 psi | 71% | 2428 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 33,649 psi | 61% | 2379 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 35,476 psi | 64% | 2418 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 40,161 psi | 73% | 2533 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 37,246 psi | 68% | 2441 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 37,405 psi | 68% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 80% | 33,547 psi | 61% | 2415 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 31,241 psi | 57% | 2405 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 32,909 psi | 60% | 2421 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 37,405 psi | 68% | 2543 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 40,089 psi | 73% | 2497 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,392 psi | 71% | 2520 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,627 psi | 79% | 2539 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,759 psi | 47% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,179 psi | 82% | 2569 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 37,318 psi | 68% | 2454 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,302 psi | 64% | 2513 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,080 psi | 53% | 2392 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 32,634 psi | 59% | 2470 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 35,940 psi | 65% | 2536 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 40,901 psi | 74% | 2477 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 35,520 psi | 64% | 2398 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 28,877 psi | 52% | 2313 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 41,858 psi | 76% | 2530 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 35,476 psi | 64% | 2418 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,535 psi | 66% | 2464 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 33,649 psi | 61% | 2379 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 94% | 40,161 psi | 73% | 2533 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,313 psi | 55% | 2362 fps | 96.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 37,913 psi | 69% | 2464 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,912 psi | 67% | 2461 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,262 psi | 71% | 2402 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,198 psi | 58% | 2280 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 39,262 psi | 71% | 2454 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 43,323 psi | 79% | 2572 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 38,464 psi | 70% | 2402 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,942 psi | 69% | 2470 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 29,950 psi | 54% | 2320 fps | 97.1% |
| Somchem S365 | <<locked>> | 84% | 24,453 psi | 44% | 2254 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 44,628 psi | 81% | 2461 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,479 psi | 72% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,621 psi | 63% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,578 psi | 65% | 2395 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,529 psi | 52% | 2267 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 30,806 psi | 56% | 2356 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 40,176 psi | 73% | 2490 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 33,939 psi | 62% | 2382 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 31,995 psi | 58% | 2408 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 27,949 psi | 51% | 2382 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 27,383 psi | 50% | 2238 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 39,175 psi | 71% | 2533 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 38,464 psi | 70% | 2559 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 26,687 psi | 48% | 2375 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,926 psi | 65% | 2461 fps | 98.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for 7.5 x 55 Swiss loaded with the .308 | 180gr | Hornady GMX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,812 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,812 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.