Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .284 | 175gr | Nosler Partition bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Hunter, Alliant Reloder-26 and Norma MRP.
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 2495 | <<locked>> | 82% | 57,740 psi | 89% | 2569 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,581 psi | 90% | 2651 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,130 psi | 88% | 2703 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,059 psi | 89% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,521 psi | 85% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,317 psi | 85% | 2792 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 86% | 57,870 psi | 89% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,043 psi | 86% | 2736 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2792 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,057 psi | 57% | 2480 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,551 psi | 89% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,711 psi | 90% | 2677 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,405 psi | 85% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,014 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,479 psi | 88% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,376 psi | 85% | 2726 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,652 psi | 87% | 2789 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2713 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,383 psi | 71% | 2657 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,943 psi | 89% | 2854 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,851 psi | 80% | 2717 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 56,159 psi | 86% | 2648 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,467 psi | 65% | 2589 fps | 96.3% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,652 psi | 87% | 2789 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 55,506 psi | 85% | 2644 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,992 psi | 71% | 2602 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 84% | 56,318 psi | 87% | 2667 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,363 psi | 88% | 2743 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,130 psi | 88% | 2703 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 57,682 psi | 89% | 2740 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,420 psi | 87% | 2720 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,449 psi | 87% | 2667 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,711 psi | 89% | 2694 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,571 psi | 70% | 2703 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 90% | 57,740 psi | 89% | 2782 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,593 psi | 56% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,291 psi | 90% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,435 psi | 88% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,275 psi | 87% | 2631 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,318 psi | 87% | 2677 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,000 psi | 88% | 2667 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 55,811 psi | 86% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,855 psi | 87% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,376 psi | 85% | 2671 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,853 psi | 84% | 2766 fps | 98.3% |
| Lovex S060 | <<locked>> | 82% | 58,508 psi | 90% | 2618 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,725 psi | 89% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,101 psi | 88% | 2661 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,494 psi | 90% | 2703 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,456 psi | 73% | 2566 fps | 99.6% |
| Norma 203B | <<locked>> | 84% | 58,363 psi | 90% | 2687 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,450 psi | 88% | 2733 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 56,420 psi | 87% | 2815 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 57,435 psi | 88% | 2723 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,463 psi | 85% | 2667 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2789 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,449 psi | 87% | 2733 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,574 psi | 76% | 2671 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 58% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,101 psi | 86% | 2654 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,058 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,361 psi | 85% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,392 psi | 88% | 2795 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,513 psi | 70% | 2700 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,970 psi | 86% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,362 psi | 87% | 2648 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,943 psi | 89% | 2710 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 58,639 psi | 90% | 2769 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 55,506 psi | 85% | 2644 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,101 psi | 88% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,725 psi | 89% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,494 psi | 90% | 2703 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,943 psi | 89% | 2703 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,711 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,898 psi | 88% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,855 psi | 87% | 2621 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,146 psi | 89% | 2766 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 56,275 psi | 87% | 2641 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,753 psi | 86% | 2651 fps | 97.6% |
| Somchem S365 | <<locked>> | 94% | 57,290 psi | 88% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,317 psi | 85% | 2690 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,434 psi | 87% | 2549 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,608 psi | 87% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,595 psi | 89% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,173 psi | 86% | 2671 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 2671 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 84% | 58,175 psi | 89% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,158 psi | 85% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,275 psi | 87% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,579 psi | 87% | 2808 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,225 psi | 74% | 2664 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,405 psi | 85% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,682 psi | 89% | 2746 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,313 psi | 76% | 2785 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,477 psi | 85% | 2687 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% | 54,259 psi | 83% | 2526 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,503 psi | 79% | 2549 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 29,167 psi | 45% | 2198 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 51,474 psi | 79% | 2539 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,595 psi | 61% | 2438 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 44,831 psi | 69% | 2618 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 48,124 psi | 74% | 2516 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,029 psi | 59% | 2418 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 44,077 psi | 68% | 2569 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 34,737 psi | 53% | 2425 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,708 psi | 83% | 2726 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,834 psi | 75% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,170 psi | 80% | 2605 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,348 psi | 59% | 2448 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,381 psi | 67% | 2556 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,898 psi | 58% | 2418 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,145 psi | 59% | 2467 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,239 psi | 43% | 2228 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,936 psi | 46% | 2290 fps | 95.8% |
| Alliant Reloder-26 | 49.8 gr | 80% | 30,008 psi | 46% | 2333 fps | 96.9% |
| Bofors RP15 | <<locked>> | 90% | 37,637 psi | 58% | 2454 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,400 psi | 76% | 2552 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,682 psi | 61% | 2533 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 38,145 psi | 59% | 2467 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,192 psi | 66% | 2444 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 40,364 psi | 62% | 2490 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 49,632 psi | 76% | 2569 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,379 psi | 64% | 2480 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 44,251 psi | 68% | 2497 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 44,179 psi | 68% | 2523 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,238 psi | 71% | 2559 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,969 psi | 55% | 2346 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,041 psi | 83% | 2644 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,608 psi | 58% | 2526 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 40,176 psi | 62% | 2493 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,369 psi | 42% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,650 psi | 84% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,647 psi | 78% | 2546 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,750 psi | 81% | 2579 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,798 psi | 60% | 2379 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,570 psi | 69% | 2470 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 37,956 psi | 58% | 2392 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 53,534 psi | 82% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,221 psi | 66% | 2467 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 42,221 psi | 65% | 2546 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 55,187 psi | 85% | 2575 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,952 psi | 78% | 2543 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,264 psi | 65% | 2428 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 40,495 psi | 62% | 2411 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 30,356 psi | 47% | 2228 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 51,532 psi | 79% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,348 psi | 59% | 2408 fps | 95.3% |
| Norma MRP | 49.6 gr | 82% | 32,503 psi | 50% | 2362 fps | 95% |
| Norma URP | <<locked>> | 80% | 39,233 psi | 60% | 2431 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 51,924 psi | 80% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,829 psi | 64% | 2552 fps | 95.6% |
| Ramshot Hunter | 47.9 gr | 80% | 37,971 psi | 58% | 2421 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 34,664 psi | 53% | 2382 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 43% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,356 psi | 76% | 2552 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,079 psi | 71% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,247 psi | 60% | 2454 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,898 psi | 58% | 2467 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,476 psi | 53% | 2448 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 52,765 psi | 81% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,557 psi | 72% | 2507 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,076 psi | 65% | 2454 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 36,941 psi | 57% | 2398 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,192 psi | 66% | 2444 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,264 psi | 65% | 2428 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 50,952 psi | 78% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,495 psi | 62% | 2411 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,645 psi | 73% | 2559 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 55,071 psi | 85% | 2625 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,645 psi | 73% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,292 psi | 64% | 2375 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,608 psi | 56% | 2395 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,789 psi | 72% | 2507 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,788 psi | 70% | 2497 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,636 psi | 55% | 2392 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,128 psi | 54% | 2333 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 53,359 psi | 82% | 2513 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,345 psi | 82% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,672 psi | 69% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,611 psi | 62% | 2428 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 36,970 psi | 57% | 2369 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,474 psi | 79% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,987 psi | 62% | 2431 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,343 psi | 48% | 2297 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 43,004 psi | 66% | 2575 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 42,322 psi | 65% | 2559 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,494 psi | 61% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,379 psi | 64% | 2480 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,903 psi | 38% | 2215 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,796 psi | 57% | 2369 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 | 175gr | Nosler Partition. Alliant Reloder-26 delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,854 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 175.0 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, 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. Ramshot Hunter, Alliant Reloder-26, Norma MRP rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .284 | 175gr | 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.