Load Specifications
Bullet Manufacturer:Winchester
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Case Length (l3):2.003"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:13.0
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 180gr | Winchester FailSafe bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 56,550 psi | 87% | 2644 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,479 psi | 90% | 2717 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,332 psi | 85% | 2671 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,087 psi | 88% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,957 psi | 89% | 2730 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,235 psi | 65% | 2579 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 55,419 psi | 85% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,100 psi | 85% | 2805 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,666 psi | 86% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,782 psi | 87% | 2753 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,131 psi | 89% | 2749 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,796 psi | 86% | 2674 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,347 psi | 85% | 2871 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,884 psi | 88% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,435 psi | 88% | 2795 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,333 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 57,653 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,321 psi | 62% | 2608 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,136 psi | 69% | 2769 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,477 psi | 85% | 2766 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 57,638 psi | 89% | 2789 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,421 psi | 88% | 2762 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,130 psi | 86% | 2680 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,624 psi | 89% | 2779 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,985 psi | 86% | 2828 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 58,697 psi | 90% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 58,624 psi | 90% | 2805 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 58,189 psi | 90% | 2858 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 96% | 58,711 psi | 90% | 2818 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 56,289 psi | 87% | 2759 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,605 psi | 81% | 2736 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,680 psi | 86% | 2792 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,955 psi | 85% | 2841 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 55% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,406 psi | 88% | 2759 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,521 psi | 87% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,159 psi | 86% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,043 psi | 86% | 2717 fps | 98.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 2785 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,854 psi | 86% | 2743 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2795 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 55,317 psi | 85% | 2772 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 58,131 psi | 89% | 2749 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 58,697 psi | 90% | 2736 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,390 psi | 85% | 2723 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,320 psi | 90% | 2723 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,985 psi | 86% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 58,726 psi | 90% | 2782 fps | 99.5% |
| Lovex S070 | <<locked>> | 98% | 56,144 psi | 86% | 2769 fps | 98.6% |
| Norma 201 | <<locked>> | 88% | 57,740 psi | 89% | 2743 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,378 psi | 90% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,608 psi | 87% | 2782 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2841 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 45,049 psi | 69% | 2726 fps | 96.3% |
| Norma URPᴾ | <<locked>> | 100% | 57,841 psi | 89% | 2844 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 57,290 psi | 88% | 2808 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,594 psi | 87% | 2844 fps | 99.2% |
| Ramshot TAC | <<locked>> | 86% | 58,479 psi | 90% | 2772 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 58,218 psi | 90% | 2789 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,390 psi | 85% | 2703 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 56% | 1699 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,638 psi | 89% | 2726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 58,798 psi | 90% | 2789 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 58,146 psi | 89% | 2861 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,537 psi | 89% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,752 psi | 84% | 2828 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 58,160 psi | 89% | 2913 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 86% | 58,711 psi | 90% | 2720 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 58,218 psi | 90% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,217 psi | 88% | 2776 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,421 psi | 88% | 2762 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 58,726 psi | 90% | 2782 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,390 psi | 85% | 2723 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,985 psi | 86% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,144 psi | 86% | 2769 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,303 psi | 85% | 2789 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,956 psi | 88% | 2753 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,638 psi | 89% | 2772 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,840 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,144 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,579 psi | 86% | 2694 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 55,753 psi | 86% | 2730 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,494 psi | 90% | 2674 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,608 psi | 87% | 2743 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,421 psi | 88% | 2772 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,098 psi | 80% | 2795 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2684 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 82% | 55,434 psi | 85% | 2592 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,115 psi | 86% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,378 psi | 90% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,448 psi | 85% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,347 psi | 85% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,608 psi | 87% | 2785 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 58,624 psi | 90% | 2746 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,985 psi | 88% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,695 psi | 86% | 2795 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,541 psi | 69% | 2684 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,014 psi | 88% | 2766 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,998 psi | 85% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 58,189 psi | 90% | 2858 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,172 psi | 56% | 2625 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,508 psi | 88% | 2779 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,966 psi | 77% | 2556 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,868 psi | 84% | 2671 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,844 psi | 66% | 2493 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,922 psi | 77% | 2638 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,614 psi | 69% | 2516 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 36,796 psi | 57% | 2474 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 40,538 psi | 62% | 2490 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,865 psi | 49% | 2375 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,122 psi | 71% | 2598 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 39,233 psi | 60% | 2454 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,196 psi | 74% | 2602 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,689 psi | 75% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | 50.8 gr | 80% | 41,974 psi | 65% | 2635 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,928 psi | 60% | 2477 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,800 psi | 64% | 2539 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,213 psi | 50% | 2388 fps | 95.4% |
| Alliant Reloder-17 | 50 gr | 80% | 33,576 psi | 52% | 2454 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,920 psi | 43% | 2297 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,214 psi | 53% | 2523 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,295 psi | 70% | 2605 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 38,667 psi | 59% | 2484 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 44,817 psi | 69% | 2559 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,893 psi | 77% | 2589 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,181 psi | 73% | 2628 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,170 psi | 80% | 2772 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 55,259 psi | 85% | 2690 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,363 psi | 61% | 2484 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 88% | 41,655 psi | 64% | 2582 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 45,382 psi | 70% | 2605 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 46,543 psi | 72% | 2608 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,688 psi | 43% | 2238 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,554 psi | 65% | 2585 fps | 99.7% |
| Hodgdon Superformance | 59.5 gr | 90% | 44,338 psi | 68% | 2657 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 41% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,527 psi | 69% | 2562 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 46,456 psi | 71% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,205 psi | 63% | 2487 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,671 psi | 67% | 2510 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 42,322 psi | 65% | 2536 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,162 psi | 63% | 2490 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 31,024 psi | 48% | 2339 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,815 psi | 66% | 2569 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 48,196 psi | 74% | 2602 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 54,766 psi | 84% | 2684 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,571 psi | 70% | 2579 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,963 psi | 71% | 2536 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 41,176 psi | 63% | 2490 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,955 psi | 55% | 2388 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 41,176 psi | 63% | 2516 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,281 psi | 70% | 2552 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,484 psi | 70% | 2556 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,162 psi | 63% | 2530 fps | 99% |
| Norma 204 | <<locked>> | 94% | 47,950 psi | 74% | 2674 fps | 95% |
| Norma MRP | <<locked>> | 98% | 42,221 psi | 65% | 2667 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 32,314 psi | 50% | 2379 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,741 psi | 63% | 2543 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 38,261 psi | 59% | 2523 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,979 psi | 74% | 2612 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,790 psi | 74% | 2635 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,822 psi | 80% | 2651 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1519 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,838 psi | 83% | 2677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,769 psi | 61% | 2470 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,295 psi | 68% | 2644 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,737 psi | 55% | 2516 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,881 psi | 52% | 2444 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,172 psi | 56% | 2503 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 49,182 psi | 76% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,062 psi | 66% | 2507 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,463 psi | 56% | 2431 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 44,817 psi | 69% | 2559 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,955 psi | 55% | 2388 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,571 psi | 70% | 2579 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,176 psi | 63% | 2490 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 41,176 psi | 63% | 2516 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,434 psi | 58% | 2480 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,543 psi | 72% | 2592 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,701 psi | 69% | 2572 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,427 psi | 71% | 2500 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,754 psi | 60% | 2375 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,176 psi | 62% | 2438 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 52,112 psi | 80% | 2680 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,166 psi | 71% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,093 psi | 71% | 2585 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 37,289 psi | 57% | 2438 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 27,021 psi | 42% | 2277 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 42,598 psi | 66% | 2579 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 52,330 psi | 81% | 2552 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,818 psi | 72% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,612 psi | 66% | 2484 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,178 psi | 66% | 2497 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,418 psi | 54% | 2375 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 33,663 psi | 52% | 2379 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 48,298 psi | 74% | 2602 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,452 psi | 64% | 2484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,185 psi | 51% | 2382 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 29,921 psi | 46% | 2369 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,256 psi | 48% | 2303 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 48,066 psi | 74% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,887 psi | 64% | 2589 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,934 psi | 43% | 2369 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,135 psi | 68% | 2575 fps | 99.7% |
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 102 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 180gr | Winchester FailSafe. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,913 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,913 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 Rem. SA Ultra Mag. with the .308 | 180gr | Winchester FailSafe 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.