Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Prvi Partizan SP bullet and 68 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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>> | 90% | 57,130 psi | 88% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,450 psi | 88% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,115 psi | 86% | 2930 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 58,581 psi | 90% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,927 psi | 88% | 2933 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,332 psi | 85% | 2897 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,967 psi | 80% | 2927 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,639 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,001 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,319 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,201 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,100 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,825 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,508 psi | 89% | 2982 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,711 psi | 89% | 2887 fps | 98% |
| Bofors RP15 | <<locked>> | 92% | 56,492 psi | 87% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,027 psi | 85% | 2910 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,319 psi | 88% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,610 psi | 90% | 2854 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,913 psi | 88% | 2920 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,173 psi | 86% | 2864 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,984 psi | 85% | 2848 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,969 psi | 85% | 2782 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,015 psi | 89% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,203 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,754 psi | 89% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,695 psi | 87% | 2848 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 55,027 psi | 85% | 2910 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,313 psi | 76% | 2835 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,276 psi | 88% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,840 psi | 86% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,769 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,537 psi | 90% | 2900 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,067 psi | 77% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,406 psi | 88% | 2943 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,666 psi | 86% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,173 psi | 86% | 2930 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,392 psi | 90% | 2894 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,824 psi | 84% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,885 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,318 psi | 87% | 2900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,998 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,621 psi | 84% | 2927 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 55,521 psi | 85% | 2835 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 57,754 psi | 89% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,610 psi | 90% | 2854 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,276 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,840 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,347 psi | 87% | 2776 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,363 psi | 88% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,159 psi | 88% | 2825 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 56,985 psi | 88% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,117 psi | 89% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,130 psi | 88% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,059 psi | 89% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,363 psi | 88% | 2864 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 82% | 56,449 psi | 87% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,058 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,898 psi | 88% | 2943 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 57,711 psi | 89% | 2927 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,143 psi | 85% | 2930 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 56,275 psi | 87% | 2989 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,913 psi | 88% | 2776 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,563 psi | 84% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,262 psi | 90% | 2867 fps | 100% |
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% | 40,625 psi | 63% | 2569 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,650 psi | 83% | 2802 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,018 psi | 65% | 2677 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,599 psi | 69% | 2694 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,045 psi | 62% | 2628 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,463 psi | 56% | 2543 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 48,240 psi | 74% | 2854 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 29,153 psi | 45% | 2392 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,329 psi | 79% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,556 psi | 69% | 2687 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,669 psi | 63% | 2638 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,349 psi | 61% | 2592 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,924 psi | 52% | 2516 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,295 psi | 68% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,327 psi | 76% | 2851 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,645 psi | 73% | 2717 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,768 psi | 58% | 2572 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 36,245 psi | 56% | 2559 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,669 psi | 63% | 2638 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 54,955 psi | 85% | 2802 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,679 psi | 53% | 2500 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,656 psi | 66% | 2635 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,887 psi | 64% | 2618 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,327 psi | 74% | 2690 fps | 100% |
| Hodgdon Retumbo | 76.4 gr | 80% | 33,214 psi | 51% | 2539 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 43% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,285 psi | 77% | 2740 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,604 psi | 78% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,787 psi | 67% | 2628 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,725 psi | 60% | 2612 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,231 psi | 57% | 2595 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 53,882 psi | 83% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,359 psi | 81% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,969 psi | 54% | 2448 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 51,068 psi | 79% | 2789 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,443 psi | 47% | 2444 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,975 psi | 66% | 2707 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,083 psi | 80% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,551 psi | 59% | 2615 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 51,097 psi | 79% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,577 psi | 53% | 2497 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,998 psi | 83% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,417 psi | 81% | 2848 fps | 100% |
| ReloadSwiss RS 76 | 81.7 gr | 80% | 32,401 psi | 50% | 2513 fps | 96.8% |
| ReloadSwiss RS 80 | 90.6 gr | 88% | 39,929 psi | 61% | 2664 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,643 psi | 70% | 2671 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,193 psi | 68% | 2677 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 80% | 54,955 psi | 85% | 2802 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,882 psi | 83% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,359 psi | 81% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,808 psi | 81% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,845 psi | 67% | 2671 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 46,630 psi | 72% | 2657 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 49,661 psi | 76% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,701 psi | 69% | 2654 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,476 psi | 82% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,827 psi | 60% | 2533 fps | 97.7% |
| Vihtavuori N170 | <<locked>> | 94% | 53,505 psi | 82% | 2805 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 52,953 psi | 81% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,859 psi | 68% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,786 psi | 66% | 2697 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 38,087 psi | 59% | 2575 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,118 psi | 63% | 2680 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 48,501 psi | 75% | 2858 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,997 psi | 82% | 2726 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,796 psi | 57% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,075 psi | 63% | 2585 fps | 97.8% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,038 fps. Accurate 8700 gives the best case fill at 100 %, and 74 of the 74 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.