Load Specifications
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 165gr | Barnes X FN bullet and 98 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% | 58,262 psi | 90% | 2776 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 58,508 psi | 90% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,347 psi | 85% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,709 psi | 86% | 2799 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,469 psi | 68% | 2710 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 58,131 psi | 89% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,145 psi | 88% | 2940 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 57,000 psi | 88% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,783 psi | 89% | 2877 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,883 psi | 86% | 2828 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,058 psi | 88% | 2805 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,362 psi | 87% | 2999 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 58,175 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 58,784 psi | 90% | 2927 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,217 psi | 88% | 2986 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,187 psi | 85% | 2972 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,047 psi | 65% | 2740 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,992 psi | 72% | 2900 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,463 psi | 87% | 2890 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 55,854 psi | 86% | 2874 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,506 psi | 85% | 2838 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,377 psi | 88% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,680 psi | 86% | 2864 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,087 psi | 88% | 2956 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 56,420 psi | 87% | 2884 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 55,564 psi | 85% | 2927 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 94% | 56,188 psi | 86% | 2890 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 57,551 psi | 89% | 2890 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2861 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,014 psi | 88% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,130 psi | 86% | 2963 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 55% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 58,508 psi | 90% | 2890 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,624 psi | 89% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,450 psi | 88% | 2861 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,174 psi | 88% | 2841 fps | 97.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 58,682 psi | 90% | 2910 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,927 psi | 88% | 2864 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,101 psi | 88% | 2927 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 56,855 psi | 87% | 2907 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,883 psi | 86% | 2828 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,348 psi | 88% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,246 psi | 87% | 2805 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,725 psi | 89% | 2861 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,826 psi | 87% | 2864 fps | 98.9% |
| Lovex S070 | <<locked>> | 98% | 57,943 psi | 89% | 2904 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 56,362 psi | 87% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,536 psi | 87% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 90% | 58,015 psi | 89% | 2913 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,970 psi | 86% | 2907 fps | 95.9% |
| Norma URP | <<locked>> | 98% | 55,622 psi | 86% | 2923 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 58,378 psi | 90% | 2936 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,508 psi | 88% | 2966 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 55,927 psi | 86% | 2844 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,680 psi | 86% | 2864 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,724 psi | 87% | 2831 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 56% | 1788 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 58,566 psi | 90% | 2854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,347 psi | 87% | 2861 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,477 psi | 85% | 2936 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 58,639 psi | 90% | 3025 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,318 psi | 87% | 2959 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,448 psi | 85% | 2979 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 57,653 psi | 89% | 2815 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,797 psi | 87% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,753 psi | 86% | 2867 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,506 psi | 85% | 2838 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,826 psi | 87% | 2864 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,348 psi | 88% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,725 psi | 89% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,943 psi | 89% | 2904 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,753 psi | 87% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 58,682 psi | 90% | 2884 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 58,740 psi | 90% | 2900 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,058 psi | 88% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,159 psi | 88% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,043 psi | 88% | 2815 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 57,319 psi | 88% | 2864 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,884 psi | 88% | 2762 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,624 psi | 89% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,796 psi | 86% | 2861 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 2927 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,096 psi | 77% | 2805 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 56,811 psi | 87% | 2723 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,159 psi | 88% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,362 psi | 87% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,942 psi | 88% | 2805 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,913 psi | 88% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,928 psi | 89% | 2913 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 56,521 psi | 87% | 2831 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 58,523 psi | 90% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,058 psi | 88% | 2923 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2815 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 58,015 psi | 89% | 2890 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,347 psi | 87% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,825 psi | 86% | 2933 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,014 psi | 58% | 2753 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,259 psi | 85% | 2861 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% | 51,982 psi | 80% | 2690 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,050 psi | 71% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,866 psi | 80% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,124 psi | 76% | 2690 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 39,349 psi | 61% | 2612 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 43,497 psi | 67% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,316 psi | 53% | 2516 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 47,659 psi | 73% | 2726 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,727 psi | 63% | 2579 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,487 psi | 76% | 2730 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 50,285 psi | 77% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | 52.4 gr | 80% | 43,323 psi | 67% | 2762 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,756 psi | 63% | 2608 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,468 psi | 67% | 2667 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,810 psi | 55% | 2566 fps | 95.8% |
| Alliant Reloder-17 | 51.6 gr | 80% | 35,317 psi | 54% | 2579 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,720 psi | 49% | 2484 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,289 psi | 56% | 2657 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,818 psi | 72% | 2733 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 41,002 psi | 63% | 2621 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 46,615 psi | 72% | 2684 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,169 psi | 79% | 2717 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,820 psi | 75% | 2759 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,519 psi | 82% | 2904 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 41,408 psi | 64% | 2618 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 43,366 psi | 67% | 2713 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 90% | 49,734 psi | 77% | 2782 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 48,066 psi | 74% | 2740 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,660 psi | 46% | 2369 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,092 psi | 68% | 2713 fps | 99.6% |
| Hodgdon Superformance | 61.4 gr | 90% | 45,818 psi | 70% | 2779 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 42% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,050 psi | 71% | 2690 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 48,080 psi | 74% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,786 psi | 66% | 2615 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,005 psi | 69% | 2628 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 46,282 psi | 71% | 2703 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,078 psi | 69% | 2661 fps | 95.3% |
| IMR 4831 | <<locked>> | 84% | 35,201 psi | 54% | 2523 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 44,541 psi | 69% | 2700 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,487 psi | 76% | 2730 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 47,485 psi | 73% | 2713 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,326 psi | 73% | 2657 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 43,178 psi | 66% | 2625 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 40,335 psi | 62% | 2569 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 43,163 psi | 66% | 2644 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,355 psi | 73% | 2687 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,166 psi | 73% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,873 psi | 66% | 2657 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 52,417 psi | 81% | 2851 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 36,158 psi | 56% | 2559 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 42,206 psi | 65% | 2667 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 42,366 psi | 65% | 2700 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 49,501 psi | 76% | 2740 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,110 psi | 76% | 2759 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,142 psi | 82% | 2776 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 42% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 55,245 psi | 85% | 2805 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,481 psi | 64% | 2595 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,629 psi | 70% | 2772 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,376 psi | 58% | 2644 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,882 psi | 55% | 2579 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,927 psi | 58% | 2631 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 51,706 psi | 80% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,208 psi | 70% | 2641 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 38,725 psi | 60% | 2566 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 46,615 psi | 72% | 2684 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,335 psi | 62% | 2569 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,485 psi | 73% | 2713 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,178 psi | 66% | 2625 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 43,163 psi | 66% | 2644 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,899 psi | 60% | 2605 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,254 psi | 74% | 2720 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,977 psi | 71% | 2694 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,109 psi | 74% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,422 psi | 62% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,744 psi | 69% | 2612 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 53,780 psi | 83% | 2812 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,950 psi | 74% | 2631 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,674 psi | 73% | 2713 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 39,334 psi | 61% | 2569 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 29,196 psi | 45% | 2415 fps | 96.6% |
| Somchem S385 | <<locked>> | 98% | 47,239 psi | 73% | 2756 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 53,853 psi | 83% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,254 psi | 74% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,643 psi | 69% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,759 psi | 69% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,333 psi | 57% | 2503 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 35,520 psi | 55% | 2507 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 49,908 psi | 77% | 2730 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,236 psi | 67% | 2615 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,143 psi | 54% | 2513 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 32,256 psi | 50% | 2510 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,040 psi | 51% | 2428 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 49,516 psi | 76% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,366 psi | 67% | 2713 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,124 psi | 46% | 2510 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,672 psi | 70% | 2703 fps | 99.5% |
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 98 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 165gr | Barnes X FN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,025 fps; across all powders the maximum-charge window runs from 1,745 fps to 3,025 fps. Accurate 3100 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 (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:14.0 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 | 165gr | Barnes X FN 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.