Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 205gr | Sierra GameKing bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2495 | <<locked>> | 84% | 48,283 psi | 88% | 2444 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,456 psi | 86% | 2454 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,901 psi | 76% | 2480 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 48,747 psi | 88% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 47,732 psi | 87% | 2582 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 48,965 psi | 89% | 2523 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 49,806 psi | 90% | 2526 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,705 psi | 90% | 2615 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 47,790 psi | 87% | 2631 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,763 psi | 90% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 47,224 psi | 86% | 2520 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 49,284 psi | 89% | 2635 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,748 psi | 90% | 2661 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,704 psi | 88% | 2608 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 42,351 psi | 77% | 2552 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,856 psi | 72% | 2507 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 35,346 psi | 64% | 2431 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,396 psi | 81% | 2667 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 48,254 psi | 88% | 2539 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 46,862 psi | 85% | 2513 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 42,351 psi | 77% | 2552 fps | 96.7% |
| Bofors RP7 | <<locked>> | 90% | 47,253 psi | 86% | 2493 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 86% | 47,761 psi | 87% | 2530 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 47,311 psi | 86% | 2585 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 48,109 psi | 87% | 2546 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 49,487 psi | 90% | 2533 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,863 psi | 89% | 2559 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 48,341 psi | 88% | 2562 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 47,065 psi | 85% | 2612 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 65% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 47,253 psi | 86% | 2487 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 49,240 psi | 89% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 49,327 psi | 90% | 2507 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 49,153 psi | 89% | 2490 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 47,485 psi | 86% | 2523 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,979 psi | 89% | 2520 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 48,501 psi | 88% | 2575 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 48,399 psi | 88% | 2546 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 49,617 psi | 90% | 2552 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 48,182 psi | 87% | 2493 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 48,631 psi | 88% | 2454 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 49,240 psi | 89% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 48,573 psi | 88% | 2520 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 49,110 psi | 89% | 2552 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 34,592 psi | 63% | 2349 fps | 97.2% |
| Norma 201 | <<locked>> | 82% | 47,776 psi | 87% | 2470 fps | 100% |
| Norma 202 | <<locked>> | 82% | 48,370 psi | 88% | 2470 fps | 100% |
| Norma 203B | <<locked>> | 86% | 49,429 psi | 90% | 2552 fps | 100% |
| Norma 204 | <<locked>> | 94% | 47,326 psi | 86% | 2562 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 44,469 psi | 81% | 2628 fps | 98.5% |
| Norma URP | <<locked>> | 94% | 47,094 psi | 85% | 2572 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 49,516 psi | 90% | 2575 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 49,008 psi | 89% | 2621 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 66% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,993 psi | 87% | 2513 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 46,920 psi | 85% | 2572 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,806 psi | 90% | 2657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 47,268 psi | 86% | 2605 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 46,818 psi | 85% | 2628 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 48,327 psi | 88% | 2467 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 47,065 psi | 85% | 2510 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 48,153 psi | 87% | 2539 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,326 psi | 86% | 2592 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 47,253 psi | 86% | 2493 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 48,573 psi | 88% | 2520 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 48,182 psi | 87% | 2493 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 49,240 psi | 89% | 2503 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 49,110 psi | 89% | 2552 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 48,138 psi | 87% | 2562 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 49,298 psi | 89% | 2520 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 47,181 psi | 86% | 2497 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 49,385 psi | 90% | 2408 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 49,414 psi | 90% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 48,298 psi | 88% | 2470 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 46,891 psi | 85% | 2585 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 48,660 psi | 88% | 2408 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 49,139 psi | 89% | 2513 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 47,572 psi | 86% | 2510 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 49,545 psi | 90% | 2533 fps | 95.8% |
| Somchem S365 | <<locked>> | 98% | 48,080 psi | 87% | 2615 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,819 psi | 87% | 2569 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 49,690 psi | 90% | 2395 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 48,008 psi | 87% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 48,617 psi | 88% | 2448 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 48,530 psi | 88% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 49,487 psi | 90% | 2566 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 41,495 psi | 75% | 2448 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 84% | 46,833 psi | 85% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 48,443 psi | 88% | 2575 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,729 psi | 79% | 2572 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,385 psi | 90% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 47,311 psi | 86% | 2585 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,607 psi | 65% | 2539 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 46,978 psi | 85% | 2507 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 44,889 psi | 81% | 2510 fps | 96.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 42,496 psi | 77% | 2365 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,611 psi | 76% | 2356 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 29,805 psi | 54% | 2244 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,190 psi | 73% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,472 psi | 53% | 2244 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,818 psi | 83% | 2477 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 39,030 psi | 71% | 2349 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 38,638 psi | 70% | 2421 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,684 psi | 76% | 2530 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,914 psi | 71% | 2372 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,539 psi | 75% | 2428 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,095 psi | 55% | 2257 fps | 97.5% |
| Alliant Reloder-17 | 43.3 gr | 80% | 33,359 psi | 61% | 2365 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 37,884 psi | 69% | 2415 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 37,275 psi | 68% | 2451 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 23,163 psi | 42% | 2090 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 94% | 29,486 psi | 54% | 2280 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 86% | 27,702 psi | 50% | 2290 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,150 psi | 82% | 2490 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 38,551 psi | 70% | 2379 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 37,275 psi | 68% | 2451 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 34,853 psi | 63% | 2264 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 39,204 psi | 71% | 2385 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 31,879 psi | 58% | 2287 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 37,304 psi | 68% | 2352 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 46,282 psi | 84% | 2484 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,688 psi | 50% | 2165 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,453 psi | 77% | 2470 fps | 100% |
| Hodgdon Superformance | 48.1 gr | 84% | 35,665 psi | 65% | 2395 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 48% | 1378 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,440 psi | 81% | 2444 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 46,151 psi | 84% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,002 psi | 74% | 2375 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,352 psi | 79% | 2398 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 34,940 psi | 63% | 2293 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 36,129 psi | 66% | 2290 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 28,906 psi | 52% | 2211 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 42,569 psi | 77% | 2454 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 46,470 psi | 84% | 2503 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 45,237 psi | 82% | 2451 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,818 psi | 83% | 2411 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 41,017 psi | 74% | 2375 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 33,649 psi | 61% | 2247 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 31,937 psi | 58% | 2231 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 28,674 psi | 52% | 2218 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,918 psi | 82% | 2428 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,469 psi | 83% | 2431 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,915 psi | 74% | 2418 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 38,856 psi | 71% | 2411 fps | 95.2% |
| Norma MRP | <<locked>> | 92% | 34,287 psi | 62% | 2418 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 30,110 psi | 55% | 2247 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,437 psi | 73% | 2434 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 31,256 psi | 57% | 2280 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 49% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,653 psi | 72% | 2369 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,990 psi | 80% | 2526 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,491 psi | 64% | 2418 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 29,341 psi | 53% | 2260 fps | 96.8% |
| ReloadSwiss RS 70 | 44 gr | 80% | 29,472 psi | 53% | 2260 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 42,757 psi | 78% | 2385 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 36,318 psi | 66% | 2333 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 42,583 psi | 77% | 2448 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 36,593 psi | 66% | 2395 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 34,853 psi | 63% | 2264 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,649 psi | 61% | 2247 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,237 psi | 82% | 2451 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,017 psi | 74% | 2375 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 31,937 psi | 58% | 2231 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,188 psi | 67% | 2382 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,108 psi | 84% | 2470 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,425 psi | 81% | 2454 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,325 psi | 84% | 2369 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,682 psi | 70% | 2257 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 32,692 psi | 59% | 2195 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 38,580 psi | 70% | 2438 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 45,832 psi | 83% | 2369 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,006 psi | 83% | 2467 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,970 psi | 67% | 2333 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 46,354 psi | 84% | 2484 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 26,948 psi | 49% | 2208 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 34,635 psi | 63% | 2336 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 46,746 psi | 85% | 2356 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,554 psi | 77% | 2356 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,004 psi | 78% | 2369 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,259 psi | 64% | 2274 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 31,299 psi | 57% | 2241 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 36,477 psi | 66% | 2356 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 41,263 psi | 75% | 2369 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 30,763 psi | 56% | 2247 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 80% | 23,105 psi | 42% | 2110 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,169 psi | 57% | 2224 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 31,879 psi | 58% | 2287 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 23,090 psi | 42% | 2162 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,932 psi | 80% | 2461 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 39,291 psi | 71% | 2411 fps | 95.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 95 powders for 7.5 x 55 Swiss loaded with the .308 | 205gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,667 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,667 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 63–90 %, leaving at least 10 % headroom. The 205.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 7.5 x 55 Swiss with the .308 | 205gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.