Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 175gr | Prvi Partizan FMJ BT bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 58,465 psi | 90% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,085 psi | 85% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,319 psi | 88% | 2979 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 56,014 psi | 86% | 2913 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 58,117 psi | 89% | 2979 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2940 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2907 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,347 psi | 87% | 2913 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,057 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,709 psi | 86% | 2904 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,378 psi | 90% | 2972 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,260 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,999 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,913 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,041 psi | 83% | 2959 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,564 psi | 86% | 2881 fps | 97.2% |
| Bofors RP15 | <<locked>> | 94% | 57,522 psi | 89% | 2959 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 55,985 psi | 86% | 2956 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 58,378 psi | 90% | 2972 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,594 psi | 87% | 2858 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 58,233 psi | 90% | 2969 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,594 psi | 87% | 2907 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,711 psi | 90% | 2920 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,580 psi | 89% | 2913 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,565 psi | 87% | 2900 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,318 psi | 87% | 2831 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,926 psi | 85% | 3025 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,580 psi | 89% | 2943 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 57% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,726 psi | 90% | 2894 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,928 psi | 89% | 2877 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,564 psi | 86% | 2851 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,117 psi | 89% | 2894 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 56,275 psi | 87% | 2959 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,369 psi | 71% | 2812 fps | 98.2% |
| Lovex S065 | <<locked>> | 82% | 55,477 psi | 85% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,261 psi | 88% | 2874 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,144 psi | 86% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,275 psi | 87% | 2897 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 46,963 psi | 72% | 2838 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 58,668 psi | 90% | 2995 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,014 psi | 88% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,406 psi | 88% | 2979 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 56,086 psi | 86% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,956 psi | 86% | 2907 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,174 psi | 59% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,419 psi | 85% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,943 psi | 89% | 2959 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,985 psi | 86% | 3015 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,463 psi | 85% | 2972 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 56,840 psi | 87% | 2881 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 88% | 55,390 psi | 85% | 2894 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 56,594 psi | 87% | 2858 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,477 psi | 85% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,261 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,015 psi | 89% | 2828 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,682 psi | 90% | 2943 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 58,653 psi | 90% | 2871 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 58,247 psi | 90% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,883 psi | 86% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,998 psi | 85% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,593 psi | 86% | 2848 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 58,595 psi | 90% | 2907 fps | 96% |
| Vihtavuori N550 | <<locked>> | 84% | 58,088 psi | 89% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,160 psi | 90% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,189 psi | 90% | 2992 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 54,723 psi | 84% | 2917 fps | 99% |
| Vihtavuori N568 | <<locked>> | 98% | 55,956 psi | 86% | 2976 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,130 psi | 88% | 3031 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,523 psi | 90% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,768 psi | 87% | 2910 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,303 psi | 85% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,840 psi | 86% | 2861 fps | 99.7% |
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 3100 | <<locked>> | 80% | 38,856 psi | 60% | 2562 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 51,547 psi | 79% | 2805 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,975 psi | 66% | 2726 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 42,801 psi | 66% | 2687 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 80% | 38,276 psi | 59% | 2615 fps | 95% |
| ADI AR 2217 | <<locked>> | 88% | 37,304 psi | 57% | 2585 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 31,734 psi | 49% | 2490 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,221 psi | 67% | 2687 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,066 psi | 76% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,830 psi | 66% | 2680 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,754 psi | 60% | 2628 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,318 psi | 57% | 2585 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,387 psi | 50% | 2503 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,843 psi | 64% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,024 psi | 77% | 2890 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,849 psi | 75% | 2762 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 35,926 psi | 55% | 2562 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 36,796 psi | 57% | 2602 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 38,754 psi | 60% | 2628 fps | 96.8% |
| Bofors RP7 | <<locked>> | 80% | 53,142 psi | 82% | 2802 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 84% | 35,433 psi | 55% | 2543 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 52,895 psi | 81% | 2851 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 55,143 psi | 85% | 2867 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 40,857 psi | 63% | 2625 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,118 psi | 62% | 2608 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,195 psi | 71% | 2687 fps | 100% |
| Hodgdon Retumbo | 76.6 gr | 82% | 33,750 psi | 52% | 2582 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 53,330 psi | 82% | 2881 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 43% | 1680 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,544 psi | 75% | 2740 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,462 psi | 84% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,689 psi | 75% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,250 psi | 65% | 2625 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 39,508 psi | 61% | 2654 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,724 psi | 58% | 2638 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 51,953 psi | 80% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,357 psi | 78% | 2766 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,315 psi | 51% | 2438 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 49,081 psi | 76% | 2782 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 33,011 psi | 51% | 2543 fps | 96% |
| Norma MRP | <<locked>> | 80% | 40,915 psi | 63% | 2697 fps | 98.6% |
| Norma URP | <<locked>> | 80% | 49,951 psi | 77% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,465 psi | 61% | 2664 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 49,066 psi | 76% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,822 psi | 51% | 2480 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,576 psi | 79% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,937 psi | 77% | 2844 fps | 100% |
| ReloadSwiss RS 76 | 80 gr | 80% | 30,748 psi | 47% | 2490 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,524 psi | 62% | 2707 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 43,830 psi | 67% | 2664 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 42,221 psi | 65% | 2667 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 53,142 psi | 82% | 2802 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,953 psi | 80% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,357 psi | 78% | 2766 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,952 psi | 78% | 2726 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,872 psi | 64% | 2664 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 44,788 psi | 69% | 2648 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 47,543 psi | 73% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,815 psi | 66% | 2651 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 80% | 51,561 psi | 79% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,231 psi | 57% | 2523 fps | 96.9% |
| Vihtavuori N170 | <<locked>> | 96% | 54,737 psi | 84% | 2848 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 50,952 psi | 78% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,756 psi | 64% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,828 psi | 63% | 2684 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 84% | 38,769 psi | 60% | 2618 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 92% | 45,005 psi | 69% | 2785 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 96% | 49,240 psi | 76% | 2900 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,879 psi | 78% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,098 psi | 82% | 2854 fps | 100% |
| Winchester StaBALL HD | 76.8 gr | 80% | 34,418 psi | 53% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,305 psi | 60% | 2575 fps | 96.9% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 175gr | Prvi Partizan FMJ BT. Vihtavuori N570 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,031 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 175.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 175gr | Prvi Partizan FMJ 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.