Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .285 | 173gr | Prvi Partizan FMJ 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 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.
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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% | 58,508 psi | 90% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,072 psi | 88% | 2648 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,189 psi | 90% | 2740 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,434 psi | 85% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,608 psi | 87% | 2730 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,377 psi | 88% | 2838 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 86% | 58,697 psi | 90% | 2694 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,130 psi | 88% | 2776 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,711 psi | 90% | 2835 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,695 psi | 58% | 2516 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,740 psi | 90% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,246 psi | 87% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,333 psi | 87% | 2687 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,101 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,552 psi | 90% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,449 psi | 87% | 2766 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 2828 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,752 psi | 84% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,485 psi | 73% | 2697 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,969 psi | 85% | 2838 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,142 psi | 82% | 2759 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,043 psi | 88% | 2684 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,323 psi | 67% | 2628 fps | 96.6% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 2828 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 56,260 psi | 87% | 2680 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,961 psi | 68% | 2585 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 84% | 57,421 psi | 88% | 2703 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,883 psi | 86% | 2746 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,289 psi | 87% | 2717 fps | 99.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,954 psi | 83% | 2707 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,682 psi | 89% | 2762 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,450 psi | 88% | 2703 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,383 psi | 71% | 2740 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 88% | 54,955 psi | 85% | 2766 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,291 psi | 90% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,841 psi | 89% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,421 psi | 88% | 2664 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,159 psi | 86% | 2654 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 57,479 psi | 88% | 2717 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,682 psi | 89% | 2700 fps | 99.9% |
| IMR 4831 | <<locked>> | 96% | 57,711 psi | 89% | 2730 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,783 psi | 89% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,304 psi | 87% | 2707 fps | 98% |
| IMR 7828 SSC | <<locked>> | 98% | 56,391 psi | 87% | 2815 fps | 98.6% |
| Lovex S062 | <<locked>> | 84% | 58,349 psi | 90% | 2664 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,102 psi | 89% | 2700 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,086 psi | 86% | 2694 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,559 psi | 75% | 2605 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,622 psi | 86% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,247 psi | 90% | 2769 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 57,740 psi | 89% | 2854 fps | 100% |
| Norma URP | <<locked>> | 92% | 58,769 psi | 90% | 2762 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,492 psi | 87% | 2703 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,362 psi | 87% | 2825 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 57,276 psi | 88% | 2769 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2799 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,116 psi | 88% | 2690 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,204 psi | 90% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,260 psi | 87% | 2753 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,465 psi | 90% | 2831 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,354 psi | 71% | 2736 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 57,000 psi | 88% | 2631 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,203 psi | 88% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,711 psi | 90% | 2746 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 96% | 55,927 psi | 86% | 2756 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,260 psi | 87% | 2680 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,102 psi | 89% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,349 psi | 90% | 2664 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,086 psi | 86% | 2694 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,071 psi | 85% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,783 psi | 89% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,696 psi | 89% | 2657 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,463 psi | 85% | 2749 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,174 psi | 88% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,855 psi | 88% | 2694 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 58,334 psi | 90% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,666 psi | 87% | 2733 fps | 99.7% |
| Unknown powder | <<locked>> | 88% | 55,579 psi | 86% | 2717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 57,043 psi | 88% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 57,595 psi | 89% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,565 psi | 87% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,187 psi | 85% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,043 psi | 86% | 2687 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,954 psi | 83% | 2680 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 56,246 psi | 87% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 56,275 psi | 87% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,464 psi | 88% | 2776 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 58,088 psi | 89% | 2854 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,400 psi | 76% | 2707 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,420 psi | 87% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,883 psi | 86% | 2746 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,836 psi | 78% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 58,363 psi | 90% | 2749 fps | 99.4% |
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% | 55,100 psi | 85% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,036 psi | 72% | 2497 fps | 98.5% |
| Accurate 3100 | <<locked>> | 80% | 29,704 psi | 46% | 2228 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 52,257 psi | 80% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,277 psi | 62% | 2470 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 96% | 49,690 psi | 76% | 2717 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 48,791 psi | 75% | 2549 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,696 psi | 60% | 2454 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 41,930 psi | 65% | 2549 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 33,228 psi | 51% | 2402 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,607 psi | 84% | 2762 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,545 psi | 76% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,852 psi | 81% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,972 psi | 60% | 2480 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,222 psi | 68% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,566 psi | 59% | 2451 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,274 psi | 56% | 2444 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,747 psi | 44% | 2260 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,601 psi | 44% | 2267 fps | 95% |
| Alliant Reloder-26 | 51.2 gr | 80% | 30,748 psi | 47% | 2372 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 38,435 psi | 59% | 2490 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,067 psi | 77% | 2585 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,567 psi | 62% | 2569 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,274 psi | 56% | 2444 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 43,816 psi | 67% | 2477 fps | 98% |
| Hodgdon H1000 | <<locked>> | 98% | 41,118 psi | 63% | 2530 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,212 psi | 77% | 2602 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,788 psi | 70% | 2585 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,365 psi | 64% | 2461 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 94% | 44,701 psi | 69% | 2552 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 43,947 psi | 68% | 2539 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,651 psi | 56% | 2375 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,085 psi | 56% | 2507 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,002 psi | 63% | 2533 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 42% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,590 psi | 79% | 2589 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,433 psi | 84% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,109 psi | 74% | 2533 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,978 psi | 72% | 2510 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 39,566 psi | 61% | 2415 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,136 psi | 69% | 2503 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 35,070 psi | 54% | 2352 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 54,201 psi | 83% | 2664 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,048 psi | 68% | 2503 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 42,975 psi | 66% | 2582 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,663 psi | 80% | 2575 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,873 psi | 66% | 2457 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,104 psi | 63% | 2444 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 29,211 psi | 45% | 2215 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,228 psi | 80% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,088 psi | 60% | 2441 fps | 95.6% |
| Norma MRP | 50.9 gr | 82% | 33,098 psi | 51% | 2395 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 39,885 psi | 61% | 2464 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 52,736 psi | 81% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 42,032 psi | 65% | 2575 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 38,696 psi | 60% | 2454 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 88% | 36,245 psi | 56% | 2438 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 43% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,140 psi | 77% | 2589 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,963 psi | 72% | 2631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,030 psi | 62% | 2490 fps | 99.4% |
| ReloadSwiss RS 70 | 50.7 gr | 80% | 38,551 psi | 59% | 2500 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,157 psi | 54% | 2484 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,519 psi | 82% | 2585 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,297 psi | 73% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,960 psi | 66% | 2490 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 37,695 psi | 58% | 2434 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 43,816 psi | 67% | 2477 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,873 psi | 66% | 2457 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,663 psi | 80% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,104 psi | 63% | 2444 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,515 psi | 75% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,080 psi | 74% | 2434 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,829 psi | 64% | 2408 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,347 psi | 57% | 2428 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 47,456 psi | 73% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,642 psi | 67% | 2480 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,521 psi | 56% | 2425 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,562 psi | 52% | 2316 fps | 95% |
| Unknown powder | <<locked>> | 80% | 42,801 psi | 66% | 2513 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 80% | 53,780 psi | 83% | 2497 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 53,911 psi | 83% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,359 psi | 82% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,683 psi | 63% | 2392 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,917 psi | 66% | 2487 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 88% | 36,521 psi | 56% | 2379 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 52,837 psi | 81% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,366 psi | 67% | 2526 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,010 psi | 49% | 2329 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 92% | 44,440 psi | 68% | 2628 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 96% | 43,221 psi | 67% | 2595 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,118 psi | 62% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,788 psi | 70% | 2585 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,425 psi | 39% | 2254 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,232 psi | 59% | 2418 fps | 95.5% |
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 101 powders for 7 mm Rem. SA Ultra Mag. loaded with the .285 | 173gr | Prvi Partizan FMJ BT. Norma MRP delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,854 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.0 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, Norma MRP, ReloadSwiss RS 70 rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .285 | 173gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.