Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .284 | 175gr | Sierra MatchKing 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 Reloder-26, Ramshot Grand and ReloadSwiss RS 70.
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 2700 | <<locked>> | 86% | 55,608 psi | 86% | 2598 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,231 psi | 87% | 2690 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,551 psi | 89% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,436 psi | 90% | 2730 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,143 psi | 85% | 2779 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 86% | 57,130 psi | 88% | 2644 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,448 psi | 85% | 2726 fps | 99.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,681 psi | 87% | 2779 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,492 psi | 56% | 2464 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,101 psi | 88% | 2769 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,291 psi | 90% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,334 psi | 90% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,288 psi | 85% | 2730 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,753 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,595 psi | 90% | 2769 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2772 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,953 psi | 81% | 2703 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,876 psi | 71% | 2648 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,942 psi | 88% | 2841 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,256 psi | 79% | 2703 fps | 98.6% |
| Bofors RP3 | <<locked>> | 84% | 55,724 psi | 86% | 2641 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,756 psi | 64% | 2572 fps | 96% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2772 fps | 99.3% |
| Bofors RP7 | <<locked>> | 90% | 58,262 psi | 90% | 2680 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 42,525 psi | 65% | 2533 fps | 96% |
| Hodgdon H380 | <<locked>> | 84% | 55,927 psi | 86% | 2657 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,957 psi | 89% | 2746 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 92% | 58,349 psi | 90% | 2717 fps | 99.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,431 psi | 81% | 2657 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,854 psi | 86% | 2710 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,753 psi | 86% | 2654 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,276 psi | 88% | 2687 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,889 psi | 69% | 2684 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 90% | 57,101 psi | 88% | 2772 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,942 psi | 88% | 2638 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,362 psi | 87% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,391 psi | 87% | 2625 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 58,334 psi | 90% | 2654 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 55,724 psi | 86% | 2664 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,333 psi | 87% | 2654 fps | 99.8% |
| IMR 4831 | <<locked>> | 96% | 56,101 psi | 86% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,391 psi | 87% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,523 psi | 90% | 2710 fps | 98.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 58,581 psi | 90% | 2818 fps | 98.8% |
| Lovex S060 | <<locked>> | 82% | 58,073 psi | 89% | 2608 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,971 psi | 88% | 2621 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,753 psi | 87% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 57,856 psi | 89% | 2694 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,847 psi | 72% | 2556 fps | 99.5% |
| Norma 201 | <<locked>> | 82% | 58,392 psi | 90% | 2631 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,624 psi | 89% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,536 psi | 87% | 2717 fps | 99.1% |
| Norma MRP | <<locked>> | 98% | 55,448 psi | 85% | 2799 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 56,811 psi | 87% | 2710 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,769 psi | 90% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 58,421 psi | 90% | 2825 fps | 99% |
| Ramshot Hunter | <<locked>> | 92% | 55,535 psi | 85% | 2717 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2746 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,391 psi | 58% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,767 psi | 86% | 2648 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,275 psi | 87% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 58,189 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,753 psi | 87% | 2785 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,889 psi | 69% | 2684 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 55,535 psi | 85% | 2585 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,579 psi | 86% | 2635 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,043 psi | 88% | 2697 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 98% | 57,711 psi | 89% | 2753 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 90% | 58,262 psi | 90% | 2680 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,753 psi | 87% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,971 psi | 88% | 2621 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,856 psi | 89% | 2694 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,261 psi | 88% | 2694 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,986 psi | 89% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,492 psi | 87% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,304 psi | 87% | 2612 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,217 psi | 88% | 2749 fps | 99.4% |
| Somchem S335 | <<locked>> | 82% | 58,755 psi | 90% | 2556 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 55,579 psi | 86% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,274 psi | 85% | 2641 fps | 97.5% |
| Somchem S365 | <<locked>> | 94% | 56,579 psi | 87% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,537 psi | 90% | 2730 fps | 99.8% |
| Unknown powder | <<locked>> | 90% | 57,566 psi | 89% | 2720 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 55,738 psi | 86% | 2493 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 55,912 psi | 86% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,463 psi | 85% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,043 psi | 88% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,812 psi | 89% | 2684 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,199 psi | 80% | 2631 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 58,668 psi | 90% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,349 psi | 90% | 2733 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,579 psi | 86% | 2726 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,231 psi | 87% | 2802 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,732 psi | 73% | 2654 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 58,624 psi | 90% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,957 psi | 89% | 2746 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,167 psi | 74% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,608 psi | 87% | 2700 fps | 99.2% |
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 2700 | <<locked>> | 80% | 45,774 psi | 70% | 2448 fps | 98.2% |
| Accurate 3100 | <<locked>> | 82% | 30,734 psi | 47% | 2238 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 50,691 psi | 78% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,885 psi | 60% | 2425 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 96% | 48,008 psi | 74% | 2664 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,703 psi | 73% | 2510 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,695 psi | 58% | 2408 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 92% | 43,584 psi | 67% | 2556 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 98% | 34,360 psi | 53% | 2411 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,953 psi | 81% | 2713 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,356 psi | 74% | 2530 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,416 psi | 79% | 2592 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,724 psi | 58% | 2431 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,960 psi | 66% | 2546 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,362 psi | 57% | 2402 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,594 psi | 58% | 2451 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,746 psi | 43% | 2215 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,530 psi | 45% | 2277 fps | 95.5% |
| Alliant Reloder-26 | 49.3 gr | 80% | 29,675 psi | 46% | 2323 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 37,101 psi | 57% | 2441 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,675 psi | 75% | 2543 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,189 psi | 60% | 2520 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 37,594 psi | 58% | 2451 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,815 psi | 66% | 2434 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 98% | 39,711 psi | 61% | 2474 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 48,936 psi | 75% | 2556 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,353 psi | 68% | 2536 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 40,118 psi | 62% | 2415 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 96% | 46,195 psi | 71% | 2556 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,672 psi | 70% | 2546 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,302 psi | 54% | 2329 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,592 psi | 82% | 2638 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,188 psi | 57% | 2510 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 39,624 psi | 61% | 2480 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 42% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,169 psi | 77% | 2543 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,214 psi | 82% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,920 psi | 72% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,948 psi | 71% | 2464 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 38,435 psi | 59% | 2369 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,208 psi | 68% | 2461 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 33,997 psi | 52% | 2306 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 52,765 psi | 81% | 2618 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,571 psi | 70% | 2507 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 90% | 41,727 psi | 64% | 2533 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 54,737 psi | 84% | 2566 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,502 psi | 78% | 2533 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,626 psi | 64% | 2411 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 39,900 psi | 61% | 2398 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 30,037 psi | 46% | 2221 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 54,694 psi | 84% | 2582 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,807 psi | 78% | 2582 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,768 psi | 58% | 2392 fps | 95% |
| Norma MRP | <<locked>> | 84% | 34,243 psi | 53% | 2405 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,595 psi | 59% | 2415 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 51,242 psi | 79% | 2605 fps | 100% |
| Ramshot Grand | 54.3 gr | 88% | 40,611 psi | 63% | 2523 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,376 psi | 58% | 2408 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 88% | 35,070 psi | 54% | 2388 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,833 psi | 43% | 1483 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,008 psi | 75% | 2546 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,643 psi | 70% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,609 psi | 59% | 2441 fps | 99.2% |
| ReloadSwiss RS 70 | 48.8 gr | 80% | 37,333 psi | 57% | 2451 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 33,924 psi | 52% | 2428 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,272 psi | 80% | 2543 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,861 psi | 71% | 2493 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,742 psi | 64% | 2444 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 36,564 psi | 56% | 2388 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,815 psi | 66% | 2434 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,626 psi | 64% | 2411 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 50,502 psi | 78% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,900 psi | 61% | 2398 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,963 psi | 72% | 2546 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,389 psi | 84% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,181 psi | 73% | 2398 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,712 psi | 63% | 2362 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,624 psi | 59% | 2438 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 55,085 psi | 85% | 2513 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,064 psi | 71% | 2490 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,324 psi | 70% | 2484 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 35,186 psi | 54% | 2379 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,766 psi | 54% | 2323 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 41,481 psi | 64% | 2464 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 80% | 52,721 psi | 81% | 2457 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,823 psi | 81% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,909 psi | 80% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,784 psi | 61% | 2356 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,698 psi | 64% | 2441 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 88% | 35,418 psi | 55% | 2333 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 51,517 psi | 79% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,148 psi | 65% | 2480 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,748 psi | 47% | 2283 fps | 98% |
| Vihtavuori N560 | <<locked>> | 92% | 43,134 psi | 66% | 2579 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 41,568 psi | 64% | 2543 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,972 psi | 60% | 2385 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,353 psi | 68% | 2536 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,526 psi | 38% | 2198 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,144 psi | 57% | 2375 fps | 95% |
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 7 mm Rem. SA Ultra Mag. loaded with the .284 | 175gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,841 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 56–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Ramshot Grand, ReloadSwiss RS 70 rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .284 | 175gr | Sierra MatchKing 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.