Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .284 | 150gr | Barnes X BT bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Hodgdon Superformance.
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 2495 | <<locked>> | 82% | 56,768 psi | 87% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,841 psi | 89% | 2812 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,956 psi | 86% | 2867 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 58,436 psi | 90% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,204 psi | 90% | 2917 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,550 psi | 87% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,769 psi | 89% | 2943 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,419 psi | 85% | 2933 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,390 psi | 85% | 2949 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,826 psi | 87% | 2930 fps | 98.1% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,826 psi | 87% | 2930 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,624 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,001 psi | 89% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,464 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,114 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,058 psi | 88% | 2933 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,447 psi | 84% | 2936 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,764 psi | 80% | 2877 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,643 psi | 70% | 2808 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,158 psi | 85% | 3015 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,183 psi | 77% | 2861 fps | 97% |
| Bofors RP3 | <<locked>> | 84% | 55,680 psi | 86% | 2828 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,447 psi | 84% | 2936 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 57,812 psi | 89% | 2854 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,506 psi | 85% | 2838 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 57,014 psi | 88% | 2923 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 92% | 56,217 psi | 87% | 2874 fps | 98.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 58,059 psi | 89% | 2917 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 58,175 psi | 90% | 2881 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,448 psi | 85% | 2864 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,376 psi | 85% | 2933 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 57% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,465 psi | 90% | 2858 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,782 psi | 86% | 2792 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,535 psi | 85% | 2802 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,508 psi | 89% | 2828 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 58,131 psi | 89% | 2881 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,146 psi | 89% | 2871 fps | 99.2% |
| IMR 4831 | <<locked>> | 96% | 55,361 psi | 85% | 2864 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,912 psi | 86% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,289 psi | 87% | 2858 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2972 fps | 97% |
| Lovex S060 | <<locked>> | 82% | 57,479 psi | 88% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,811 psi | 87% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,217 psi | 87% | 2828 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 57,653 psi | 89% | 2874 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,297 psi | 73% | 2730 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 58,233 psi | 90% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,566 psi | 90% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,305 psi | 88% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,376 psi | 85% | 2881 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3022 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 56,086 psi | 86% | 2894 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,682 psi | 89% | 2887 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,985 psi | 88% | 2979 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 57,856 psi | 89% | 2940 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2900 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 58% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 58,711 psi | 90% | 2871 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 58,276 psi | 90% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,435 psi | 88% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,784 psi | 90% | 3005 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,483 psi | 68% | 2822 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 55,869 psi | 86% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,782 psi | 86% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,014 psi | 86% | 2858 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 98% | 56,695 psi | 87% | 2923 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 57,812 psi | 89% | 2854 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,217 psi | 87% | 2828 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 56,811 psi | 87% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,536 psi | 87% | 2861 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,347 psi | 87% | 2874 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,435 psi | 88% | 2848 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,566 psi | 90% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,854 psi | 86% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,985 psi | 86% | 2782 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2956 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 58,334 psi | 90% | 2743 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,740 psi | 90% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,972 psi | 89% | 2851 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 58,711 psi | 90% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,522 psi | 89% | 2900 fps | 98.9% |
| Unknown powder | <<locked>> | 90% | 56,492 psi | 87% | 2894 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 84% | 58,465 psi | 90% | 2720 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 58,073 psi | 89% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 58,247 psi | 90% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,695 psi | 87% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,985 psi | 88% | 2864 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,227 psi | 79% | 2789 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 84% | 58,001 psi | 89% | 2812 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,435 psi | 88% | 2913 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 2956 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 2956 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,348 psi | 88% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,014 psi | 88% | 2923 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,239 psi | 73% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,376 psi | 85% | 2861 fps | 97.8% |
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 2495 | <<locked>> | 80% | 53,635 psi | 83% | 2707 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,237 psi | 70% | 2602 fps | 96.5% |
| Accurate 3100 | <<locked>> | 84% | 34,345 psi | 53% | 2464 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 52,127 psi | 80% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,958 psi | 61% | 2605 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,427 psi | 73% | 2680 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,324 psi | 70% | 2723 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 98% | 52,040 psi | 80% | 2874 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,996 psi | 80% | 2894 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,512 psi | 68% | 2713 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,512 psi | 68% | 2713 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,559 psi | 75% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,430 psi | 79% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,087 psi | 59% | 2598 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,699 psi | 66% | 2717 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,976 psi | 69% | 2720 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,815 psi | 66% | 2723 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,109 psi | 45% | 2382 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,243 psi | 53% | 2539 fps | 95.5% |
| Alliant Reloder-26 | 51.8 gr | 82% | 32,808 psi | 50% | 2546 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 44,715 psi | 69% | 2759 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 49,226 psi | 76% | 2730 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,815 psi | 66% | 2723 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,236 psi | 67% | 2598 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 80% | 49,139 psi | 76% | 2733 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 44,164 psi | 68% | 2697 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 82% | 41,785 psi | 64% | 2612 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,462 psi | 84% | 2861 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,984 psi | 55% | 2500 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,892 psi | 75% | 2762 fps | 100% |
| Hodgdon Superformance | 52.1 gr | 80% | 39,784 psi | 61% | 2638 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,081 psi | 76% | 2713 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,924 psi | 81% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,862 psi | 72% | 2661 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,890 psi | 71% | 2628 fps | 97.4% |
| IMR 4350 | <<locked>> | 82% | 40,973 psi | 63% | 2575 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,410 psi | 67% | 2612 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 34,969 psi | 54% | 2477 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 52,678 psi | 81% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,026 psi | 82% | 2805 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 50,299 psi | 77% | 2858 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 54,172 psi | 83% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,604 psi | 78% | 2717 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,467 psi | 65% | 2589 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 40,770 psi | 63% | 2569 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 35,447 psi | 55% | 2490 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 55,100 psi | 85% | 2776 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,463 psi | 85% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,821 psi | 78% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,934 psi | 71% | 2717 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 39,581 psi | 61% | 2680 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 39,073 psi | 60% | 2589 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 50,836 psi | 78% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 49,458 psi | 76% | 2851 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,884 psi | 58% | 2572 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 92% | 40,828 psi | 63% | 2657 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,921 psi | 75% | 2713 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,150 psi | 69% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,204 psi | 60% | 2615 fps | 98.1% |
| ReloadSwiss RS 70 | 50.1 gr | 80% | 37,840 psi | 58% | 2615 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,262 psi | 60% | 2697 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,634 psi | 81% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,615 psi | 72% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,748 psi | 77% | 2753 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 44,266 psi | 68% | 2707 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 43,236 psi | 67% | 2598 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,467 psi | 65% | 2589 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 50,604 psi | 78% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,711 psi | 61% | 2552 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,934 psi | 72% | 2723 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,099 psi | 83% | 2799 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,390 psi | 85% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,137 psi | 73% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,524 psi | 64% | 2530 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,757 psi | 66% | 2684 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 55,288 psi | 85% | 2700 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,659 psi | 72% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,317 psi | 84% | 2795 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,810 psi | 55% | 2556 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 40,248 psi | 62% | 2592 fps | 95.3% |
| Unknown powder | <<locked>> | 80% | 41,669 psi | 64% | 2635 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 80% | 52,214 psi | 80% | 2638 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,721 psi | 80% | 2684 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,822 psi | 80% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,422 psi | 62% | 2533 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,887 psi | 64% | 2612 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 94% | 42,772 psi | 66% | 2635 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,503 psi | 79% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,511 psi | 65% | 2654 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,097 psi | 49% | 2464 fps | 97% |
| Vihtavuori N560 | <<locked>> | 98% | 51,300 psi | 79% | 2897 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,276 psi | 60% | 2549 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 44,164 psi | 68% | 2697 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,281 psi | 40% | 2372 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 90% | 45,426 psi | 70% | 2694 fps | 95.6% |
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 97 powders for 7 mm Rem. SA Ultra Mag. loaded with the .284 | 150gr | Barnes X BT. Norma MRP delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,759 fps to 3,022 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 Reloder-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .284 | 150gr | Barnes X BT 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.