Load Specifications
Bullet:.308 | 185gr | Lapua Mega
Bullet Manufacturer:Lapua
Bullet Weight:185 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:1:15.5
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 185gr | Lapua Mega bullet and 106 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.
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>> | 82% | 56,289 psi | 87% | 2618 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,448 psi | 85% | 2648 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,956 psi | 88% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,508 psi | 88% | 2710 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,108 psi | 71% | 2628 fps | 98.2% |
| Accurate 4064 | <<locked>> | 88% | 55,825 psi | 86% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,724 psi | 86% | 2792 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 55,492 psi | 85% | 2726 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,289 psi | 87% | 2726 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,679 psi | 83% | 2776 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,841 psi | 89% | 2723 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,811 psi | 86% | 2644 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,303 psi | 85% | 2848 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,913 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,159 psi | 88% | 2769 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,652 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 57,972 psi | 89% | 2874 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,533 psi | 81% | 2759 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,671 psi | 67% | 2654 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,363 psi | 59% | 2562 fps | 96.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2825 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,129 psi | 85% | 2743 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 57,653 psi | 89% | 2766 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,290 psi | 88% | 2746 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,622 psi | 86% | 2654 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,624 psi | 89% | 2756 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 58,349 psi | 90% | 2782 fps | 100% |
| Hodgdon H414 | <<locked>> | 96% | 58,450 psi | 90% | 2844 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 94% | 58,624 psi | 90% | 2802 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 56,130 psi | 86% | 2736 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,753 psi | 87% | 2769 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,840 psi | 86% | 2769 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,853 psi | 84% | 2825 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 55% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,043 psi | 88% | 2733 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,405 psi | 87% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,869 psi | 86% | 2710 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,477 psi | 85% | 2694 fps | 98.8% |
| IMR 4350 | <<locked>> | 98% | 57,653 psi | 89% | 2772 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,709 psi | 86% | 2726 fps | 98.8% |
| IMR 4831 | <<locked>> | 98% | 56,246 psi | 87% | 2782 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 58,653 psi | 90% | 2799 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,841 psi | 89% | 2723 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,622 psi | 86% | 2703 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,131 psi | 89% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,057 psi | 86% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 58,624 psi | 90% | 2766 fps | 99.8% |
| Lovex S070 | <<locked>> | 96% | 56,376 psi | 87% | 2756 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,247 psi | 59% | 2484 fps | 96.3% |
| Norma 201 | <<locked>> | 86% | 57,493 psi | 88% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 86% | 58,175 psi | 89% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,376 psi | 87% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,984 psi | 85% | 2776 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 48,747 psi | 75% | 2779 fps | 97.9% |
| Norma URP | <<locked>> | 98% | 58,189 psi | 90% | 2828 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 57,217 psi | 88% | 2785 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,101 psi | 88% | 2831 fps | 99.6% |
| Ramshot TAC | <<locked>> | 84% | 57,812 psi | 89% | 2749 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,754 psi | 89% | 2762 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,566 psi | 90% | 2726 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 58,349 psi | 90% | 2766 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 58,088 psi | 89% | 2838 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,696 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,535 psi | 85% | 2815 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 58,233 psi | 90% | 2897 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 58,334 psi | 90% | 2690 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 58,218 psi | 90% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,522 psi | 88% | 2759 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,317 psi | 85% | 2746 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,430 psi | 79% | 2743 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 94% | 57,290 psi | 88% | 2746 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 58,624 psi | 90% | 2766 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,622 psi | 86% | 2703 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,057 psi | 86% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,376 psi | 87% | 2756 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,550 psi | 85% | 2769 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,768 psi | 87% | 2733 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,217 psi | 88% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,332 psi | 85% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,680 psi | 86% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,259 psi | 85% | 2674 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,937 psi | 78% | 2740 fps | 97% |
| Somchem S335 | <<locked>> | 86% | 58,160 psi | 89% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,188 psi | 86% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,653 psi | 89% | 2756 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 57,508 psi | 88% | 2743 fps | 95.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,826 psi | 87% | 2828 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,286 psi | 80% | 2726 fps | 97.9% |
| Vihtavuori N130 | <<locked>> | 82% | 58,276 psi | 90% | 2605 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 55,724 psi | 86% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 58,320 psi | 90% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,245 psi | 85% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,477 psi | 85% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,971 psi | 88% | 2772 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,991 psi | 69% | 2592 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 84% | 58,218 psi | 90% | 2720 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,811 psi | 87% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,956 psi | 86% | 2779 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,486 psi | 75% | 2726 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,058 psi | 88% | 2749 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,711 psi | 90% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 58,450 psi | 90% | 2844 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,001 psi | 60% | 2684 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,406 psi | 88% | 2756 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 48,907 psi | 75% | 2661 fps | 96.1% |
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% | 52,910 psi | 81% | 2572 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,832 psi | 71% | 2513 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,301 psi | 82% | 2664 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,309 psi | 68% | 2500 fps | 96% |
| Accurate 3100 | <<locked>> | 92% | 35,070 psi | 54% | 2418 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 43,352 psi | 67% | 2516 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,314 psi | 50% | 2365 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,994 psi | 75% | 2628 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,553 psi | 64% | 2484 fps | 99% |
| ADI AR 2209 | <<locked>> | 96% | 47,152 psi | 73% | 2664 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,039 psi | 79% | 2628 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,011 psi | 80% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,860 psi | 69% | 2674 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,669 psi | 64% | 2510 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,570 psi | 69% | 2572 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,314 psi | 50% | 2375 fps | 96.2% |
| Alliant Reloder-17 | 52.2 gr | 80% | 36,056 psi | 55% | 2493 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,282 psi | 71% | 2654 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,513 psi | 41% | 2241 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,955 psi | 55% | 2507 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,343 psi | 50% | 2464 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,414 psi | 74% | 2638 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 41,495 psi | 64% | 2516 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 42,032 psi | 65% | 2490 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,417 psi | 81% | 2608 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,299 psi | 77% | 2654 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,221 psi | 65% | 2523 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 39,247 psi | 60% | 2516 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 42,641 psi | 66% | 2536 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 49,472 psi | 76% | 2638 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,660 psi | 46% | 2277 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,672 psi | 70% | 2618 fps | 100% |
| Hodgdon Superformance | 59.3 gr | 86% | 41,278 psi | 64% | 2585 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 41% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,297 psi | 73% | 2589 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,588 psi | 76% | 2621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,671 psi | 67% | 2516 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,137 psi | 71% | 2543 fps | 97.2% |
| IMR 4350 | <<locked>> | 88% | 42,467 psi | 65% | 2523 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,551 psi | 59% | 2421 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 31,212 psi | 48% | 2323 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,701 psi | 70% | 2598 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 51,039 psi | 79% | 2628 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,617 psi | 75% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,370 psi | 74% | 2559 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,729 psi | 67% | 2516 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,042 psi | 55% | 2375 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 38,856 psi | 60% | 2454 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 36,013 psi | 55% | 2438 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,921 psi | 74% | 2579 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,443 psi | 75% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,947 psi | 68% | 2562 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 44,817 psi | 69% | 2605 fps | 95% |
| Norma MRP | <<locked>> | 94% | 39,784 psi | 61% | 2605 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 32,401 psi | 50% | 2362 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 43,656 psi | 67% | 2575 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 36,071 psi | 55% | 2454 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 50,952 psi | 78% | 2644 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,763 psi | 78% | 2661 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,766 psi | 84% | 2674 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 42% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,380 psi | 65% | 2507 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,485 psi | 73% | 2677 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,334 psi | 59% | 2552 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,995 psi | 49% | 2382 fps | 95.6% |
| ReloadSwiss RS 70 | 54.3 gr | 82% | 33,837 psi | 52% | 2434 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 51,996 psi | 80% | 2605 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,658 psi | 70% | 2533 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,015 psi | 60% | 2464 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 51,982 psi | 80% | 2694 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 96% | 45,208 psi | 70% | 2638 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 42,032 psi | 65% | 2490 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,042 psi | 55% | 2375 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,617 psi | 75% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,729 psi | 67% | 2516 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 38,856 psi | 60% | 2454 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,030 psi | 62% | 2513 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,487 psi | 76% | 2625 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,355 psi | 73% | 2598 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,052 psi | 75% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,147 psi | 63% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,176 psi | 62% | 2421 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,773 psi | 69% | 2631 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 48,660 psi | 75% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,255 psi | 76% | 2618 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,726 psi | 61% | 2467 fps | 99.4% |
| Somchem S361 | <<locked>> | 98% | 53,592 psi | 82% | 2687 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 29,138 psi | 45% | 2320 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 40,350 psi | 62% | 2516 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 55,143 psi | 85% | 2566 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 49,516 psi | 76% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,513 psi | 70% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,759 psi | 70% | 2513 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,739 psi | 58% | 2402 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,866 psi | 52% | 2365 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 42,279 psi | 65% | 2543 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 51,184 psi | 79% | 2625 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,280 psi | 68% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,431 psi | 51% | 2369 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 28,601 psi | 44% | 2313 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,431 psi | 51% | 2343 fps | 98.4% |
| Winchester 748 | <<locked>> | 80% | 51,387 psi | 79% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 39,436 psi | 61% | 2520 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,498 psi | 41% | 2313 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,123 psi | 72% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 45,803 psi | 70% | 2608 fps | 95.3% |
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 106 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 185gr | Lapua Mega. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,897 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 185.0 gr projectile in 0.308" calls for a 1:15.5 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 .300 Rem. SA Ultra Mag. with the .308 | 185gr | Lapua Mega 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.