Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .284 | 174gr | Prvi Partizan PSP BT bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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% | 57,914 psi | 89% | 2579 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,697 psi | 90% | 2661 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,116 psi | 88% | 2713 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,218 psi | 90% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,622 psi | 86% | 2703 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,288 psi | 85% | 2802 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 86% | 57,972 psi | 89% | 2671 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,376 psi | 87% | 2753 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,508 psi | 88% | 2802 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,028 psi | 57% | 2487 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,624 psi | 89% | 2789 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,492 psi | 85% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,564 psi | 85% | 2664 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,115 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,551 psi | 89% | 2772 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,724 psi | 86% | 2740 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 2799 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2723 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,659 psi | 72% | 2671 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,899 psi | 89% | 2864 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,098 psi | 80% | 2730 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 56,260 psi | 87% | 2657 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,482 psi | 65% | 2598 fps | 96.2% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 2799 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 55,332 psi | 85% | 2651 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2615 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 84% | 56,434 psi | 87% | 2677 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,435 psi | 88% | 2753 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,232 psi | 88% | 2717 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 57,725 psi | 89% | 2746 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,391 psi | 87% | 2730 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,536 psi | 87% | 2677 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,798 psi | 89% | 2707 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,585 psi | 70% | 2710 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 90% | 58,044 psi | 89% | 2795 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 56% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,146 psi | 89% | 2664 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,290 psi | 88% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,391 psi | 87% | 2641 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,391 psi | 87% | 2684 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,087 psi | 88% | 2677 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 55,883 psi | 86% | 2694 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,985 psi | 88% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,651 psi | 86% | 2684 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,839 psi | 84% | 2776 fps | 98.3% |
| Lovex S060 | <<locked>> | 82% | 58,682 psi | 90% | 2631 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,566 psi | 89% | 2641 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,188 psi | 88% | 2671 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,581 psi | 90% | 2713 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,500 psi | 73% | 2575 fps | 99.6% |
| Norma 203B | <<locked>> | 84% | 58,508 psi | 90% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,479 psi | 88% | 2743 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 56,362 psi | 87% | 2822 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 57,522 psi | 88% | 2733 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,521 psi | 85% | 2677 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,463 psi | 85% | 2799 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,478 psi | 87% | 2743 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,516 psi | 76% | 2677 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 57% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,217 psi | 86% | 2664 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,087 psi | 88% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,390 psi | 85% | 2726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,392 psi | 88% | 2805 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,469 psi | 70% | 2707 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 56,188 psi | 86% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,463 psi | 87% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,972 psi | 89% | 2723 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 58,711 psi | 90% | 2779 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 55,332 psi | 85% | 2651 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,188 psi | 88% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,566 psi | 89% | 2641 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,581 psi | 90% | 2713 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,059 psi | 89% | 2717 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,813 psi | 90% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,029 psi | 88% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,927 psi | 88% | 2631 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,218 psi | 90% | 2776 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 56,144 psi | 86% | 2648 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,043 psi | 86% | 2664 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 57,334 psi | 88% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,637 psi | 86% | 2703 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,608 psi | 87% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,782 psi | 87% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,406 psi | 88% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,260 psi | 87% | 2680 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,868 psi | 84% | 2680 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 84% | 58,262 psi | 90% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,230 psi | 85% | 2687 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,289 psi | 87% | 2746 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,550 psi | 87% | 2815 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2677 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,405 psi | 85% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,754 psi | 89% | 2756 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2792 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,477 psi | 85% | 2697 fps | 99.1% |
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 2495 | <<locked>> | 80% | 54,172 psi | 83% | 2533 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,634 psi | 79% | 2562 fps | 99.1% |
| Accurate 3100 | <<locked>> | 82% | 31,198 psi | 48% | 2257 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 51,372 psi | 79% | 2546 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,465 psi | 61% | 2444 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 94% | 47,979 psi | 74% | 2680 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 48,283 psi | 74% | 2530 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,130 psi | 59% | 2428 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 44,121 psi | 68% | 2579 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 34,766 psi | 53% | 2431 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,838 psi | 83% | 2736 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,979 psi | 75% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,054 psi | 80% | 2615 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,261 psi | 59% | 2454 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,511 psi | 67% | 2566 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,971 psi | 58% | 2425 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,203 psi | 59% | 2477 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,181 psi | 43% | 2234 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,008 psi | 46% | 2297 fps | 95.8% |
| Alliant Reloder-26 | 50.1 gr | 80% | 30,066 psi | 46% | 2339 fps | 96.8% |
| Bofors RP15 | <<locked>> | 90% | 37,724 psi | 58% | 2464 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,298 psi | 76% | 2562 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,726 psi | 61% | 2539 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 38,203 psi | 59% | 2477 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,366 psi | 67% | 2454 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 40,364 psi | 62% | 2500 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,487 psi | 76% | 2575 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,278 psi | 64% | 2487 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 44,150 psi | 68% | 2503 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 44,237 psi | 68% | 2533 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,282 psi | 71% | 2569 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,897 psi | 55% | 2349 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,157 psi | 83% | 2657 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,681 psi | 58% | 2533 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 40,248 psi | 62% | 2503 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 42% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,810 psi | 84% | 2621 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,792 psi | 78% | 2559 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,910 psi | 81% | 2592 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,943 psi | 60% | 2392 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,701 psi | 69% | 2480 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 37,869 psi | 58% | 2398 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 53,417 psi | 82% | 2638 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,294 psi | 67% | 2477 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 42,264 psi | 65% | 2556 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 55,332 psi | 85% | 2589 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 51,111 psi | 79% | 2552 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,177 psi | 65% | 2434 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 40,408 psi | 62% | 2418 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 30,501 psi | 47% | 2238 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 51,416 psi | 79% | 2602 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,435 psi | 59% | 2418 fps | 95.3% |
| Norma MRP | 49.9 gr | 82% | 32,576 psi | 50% | 2372 fps | 95% |
| Norma URP | <<locked>> | 80% | 39,131 psi | 60% | 2438 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 52,069 psi | 80% | 2628 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,843 psi | 64% | 2559 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 38,072 psi | 59% | 2431 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 34,737 psi | 53% | 2392 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,949 psi | 43% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,487 psi | 76% | 2566 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,180 psi | 71% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,334 psi | 61% | 2464 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,971 psi | 58% | 2474 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,476 psi | 53% | 2454 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 52,939 psi | 81% | 2562 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,499 psi | 72% | 2513 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,163 psi | 65% | 2464 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 37,043 psi | 57% | 2408 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,366 psi | 67% | 2454 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,177 psi | 65% | 2434 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 51,111 psi | 79% | 2552 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,408 psi | 62% | 2418 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,761 psi | 73% | 2569 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 55,230 psi | 85% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,514 psi | 73% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,234 psi | 63% | 2382 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,695 psi | 56% | 2405 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 46,688 psi | 72% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,832 psi | 71% | 2507 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,752 psi | 55% | 2402 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,244 psi | 54% | 2343 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 53,258 psi | 82% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,229 psi | 82% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,556 psi | 69% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,509 psi | 62% | 2434 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 37,028 psi | 57% | 2379 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,329 psi | 79% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,914 psi | 61% | 2434 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,314 psi | 48% | 2303 fps | 98.2% |
| Vihtavuori N560 | 54.7 gr | 90% | 43,047 psi | 66% | 2585 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 42,337 psi | 65% | 2569 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,581 psi | 61% | 2405 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,495 psi | 64% | 2493 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,990 psi | 38% | 2224 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,869 psi | 57% | 2379 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 95 powders for 7 mm Rem. SA Ultra Mag. loaded with the .284 | 174gr | Prvi Partizan PSP BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,864 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 174.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .284 | 174gr | Prvi Partizan PSP 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.