Load Specifications
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 170gr | Nosler Partition bullet and 99 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.
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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% | 56,855 psi | 87% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,782 psi | 86% | 2769 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,609 psi | 89% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 58,581 psi | 90% | 2831 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,902 psi | 66% | 2674 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 56,028 psi | 86% | 2822 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,767 psi | 86% | 2907 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,072 psi | 86% | 2851 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,174 psi | 88% | 2854 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,537 psi | 90% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,086 psi | 86% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,695 psi | 86% | 2972 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,217 psi | 88% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,827 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,681 psi | 87% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,363 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,756 psi | 63% | 2703 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,759 psi | 70% | 2867 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,898 psi | 86% | 2867 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 58,131 psi | 89% | 2894 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,696 psi | 89% | 2861 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,507 psi | 87% | 2782 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 58,175 psi | 89% | 2884 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,449 psi | 87% | 2930 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,143 psi | 85% | 2851 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 58,610 psi | 90% | 2959 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 55,347 psi | 85% | 2864 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 56,710 psi | 87% | 2861 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,084 psi | 82% | 2835 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,231 psi | 87% | 2894 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,448 psi | 85% | 2940 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 55% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,943 psi | 89% | 2864 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,927 psi | 88% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,449 psi | 87% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,463 psi | 87% | 2815 fps | 98.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 58,059 psi | 89% | 2887 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,217 psi | 86% | 2841 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,362 psi | 87% | 2900 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 55,535 psi | 85% | 2871 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 58,537 psi | 90% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,912 psi | 86% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,755 psi | 90% | 2825 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,565 psi | 87% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,782 psi | 86% | 2838 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 56,782 psi | 87% | 2874 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 58,175 psi | 89% | 2844 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,784 psi | 90% | 2841 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,985 psi | 88% | 2884 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,216 psi | 85% | 2884 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 45,629 psi | 70% | 2825 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2946 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 57,841 psi | 89% | 2910 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,029 psi | 88% | 2943 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 55,303 psi | 85% | 2825 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 58,668 psi | 90% | 2894 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,622 psi | 86% | 2802 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,201 psi | 56% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,972 psi | 89% | 2828 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,550 psi | 85% | 2835 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 58,465 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 58,117 psi | 89% | 2999 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,579 psi | 86% | 2930 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,781 psi | 84% | 2956 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,796 psi | 86% | 2776 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,143 psi | 85% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 58,001 psi | 89% | 2884 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,696 psi | 89% | 2861 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,782 psi | 86% | 2838 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,912 psi | 86% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,565 psi | 87% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,782 psi | 87% | 2874 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,883 psi | 86% | 2890 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,435 psi | 88% | 2854 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,914 psi | 89% | 2871 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,072 psi | 86% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,463 psi | 87% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,970 psi | 86% | 2789 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 56,231 psi | 87% | 2835 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,564 psi | 85% | 2733 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,029 psi | 88% | 2841 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,957 psi | 89% | 2877 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,663 psi | 81% | 2894 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,095 psi | 76% | 2779 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,970 psi | 86% | 2694 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,347 psi | 87% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,624 psi | 90% | 2802 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,767 psi | 86% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,072 psi | 86% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,246 psi | 88% | 2890 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 55,434 psi | 85% | 2802 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,493 psi | 88% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,391 psi | 87% | 2900 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,860 psi | 69% | 2776 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,537 psi | 89% | 2867 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,579 psi | 86% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,100 psi | 85% | 2907 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,506 psi | 56% | 2710 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,943 psi | 89% | 2881 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% | 50,285 psi | 77% | 2654 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,062 psi | 66% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,198 psi | 77% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,991 psi | 69% | 2612 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 39,929 psi | 61% | 2615 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,756 psi | 63% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,198 psi | 50% | 2461 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 46,427 psi | 71% | 2694 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,421 psi | 61% | 2546 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,486 psi | 75% | 2700 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,255 psi | 76% | 2684 fps | 100% |
| Alliant Power Pro 2000-MR | 53.6 gr | 80% | 42,380 psi | 65% | 2733 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,291 psi | 60% | 2569 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,090 psi | 65% | 2631 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,445 psi | 50% | 2470 fps | 95% |
| Alliant Reloder-17 | 52.8 gr | 80% | 33,982 psi | 52% | 2543 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,008 psi | 46% | 2434 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,548 psi | 53% | 2612 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,643 psi | 70% | 2700 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 39,088 psi | 60% | 2575 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,121 psi | 69% | 2651 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,038 psi | 77% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,601 psi | 73% | 2726 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,533 psi | 81% | 2871 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,755 psi | 61% | 2579 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 42,163 psi | 65% | 2680 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 48,820 psi | 75% | 2756 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 46,847 psi | 72% | 2707 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,036 psi | 43% | 2323 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,844 psi | 66% | 2677 fps | 99.6% |
| Hodgdon Superformance | 62.7 gr | 90% | 44,701 psi | 69% | 2749 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 41% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,817 psi | 69% | 2657 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,731 psi | 72% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,394 psi | 64% | 2579 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,903 psi | 68% | 2602 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 45,252 psi | 70% | 2677 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,947 psi | 68% | 2631 fps | 95.6% |
| IMR 4831 | <<locked>> | 84% | 33,417 psi | 51% | 2474 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,120 psi | 66% | 2661 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,486 psi | 75% | 2700 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,730 psi | 70% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,122 psi | 71% | 2628 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,379 psi | 64% | 2582 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,624 psi | 59% | 2530 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 41,437 psi | 64% | 2605 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,455 psi | 70% | 2648 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,861 psi | 71% | 2651 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,437 psi | 64% | 2621 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 51,590 psi | 79% | 2825 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 42,627 psi | 66% | 2762 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 34,621 psi | 53% | 2513 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 41,147 psi | 63% | 2635 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 38,493 psi | 59% | 2608 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 48,298 psi | 74% | 2710 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,921 psi | 74% | 2726 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,243 psi | 80% | 2749 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 42% | 1585 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,302 psi | 84% | 2779 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,045 psi | 62% | 2559 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,454 psi | 68% | 2736 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,172 psi | 56% | 2608 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,084 psi | 52% | 2530 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,535 psi | 56% | 2595 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,559 psi | 76% | 2684 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,294 psi | 67% | 2598 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 36,782 psi | 57% | 2520 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 45,121 psi | 69% | 2651 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,624 psi | 59% | 2530 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,730 psi | 70% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,379 psi | 64% | 2582 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,437 psi | 64% | 2605 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,550 psi | 58% | 2566 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,920 psi | 72% | 2687 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,802 psi | 69% | 2664 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,775 psi | 72% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,059 psi | 60% | 2464 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,308 psi | 67% | 2579 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 52,504 psi | 81% | 2779 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,340 psi | 71% | 2595 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,456 psi | 71% | 2680 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,434 psi | 58% | 2523 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,238 psi | 42% | 2356 fps | 96.3% |
| Somchem S385 | <<locked>> | 98% | 45,905 psi | 71% | 2723 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,692 psi | 81% | 2651 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,152 psi | 73% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,018 psi | 66% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,526 psi | 67% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,737 psi | 55% | 2461 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,968 psi | 52% | 2467 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 48,791 psi | 75% | 2700 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,858 psi | 64% | 2579 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,431 psi | 51% | 2467 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,372 psi | 50% | 2510 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,502 psi | 48% | 2385 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 48,631 psi | 75% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,163 psi | 65% | 2680 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,195 psi | 43% | 2448 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,382 psi | 68% | 2667 fps | 99.6% |
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 99 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 170gr | Nosler Partition. Alliant Reloder-17 delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,732 fps to 3,002 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 170.0 gr projectile in 0.308" calls for a 1:6.0 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 | 170gr | Nosler Partition 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.