Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Nosler Ballistic Silver Tip bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H1000, Hodgdon Retumbo 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% | 57,377 psi | 88% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,928 psi | 89% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,115 psi | 86% | 3005 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 88% | 55,071 psi | 85% | 2946 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 56,971 psi | 88% | 3009 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 2972 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,864 psi | 77% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,984 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,378 psi | 90% | 2989 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,261 psi | 88% | 3005 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,998 psi | 85% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,726 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,593 psi | 86% | 3005 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,881 psi | 81% | 2982 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,305 psi | 90% | 2966 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 56,420 psi | 87% | 2989 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3041 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 57,261 psi | 88% | 3005 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 55,738 psi | 86% | 2894 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 56,956 psi | 88% | 2995 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,535 psi | 85% | 2943 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,928 psi | 89% | 2956 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 56,594 psi | 87% | 2946 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,390 psi | 85% | 2930 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,259 psi | 85% | 2867 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,551 psi | 89% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,478 psi | 87% | 2976 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,740 psi | 89% | 2927 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,072 psi | 88% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,088 psi | 89% | 2933 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,276 psi | 88% | 2930 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 55,129 psi | 85% | 2989 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,353 psi | 70% | 2838 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 58,059 psi | 89% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,304 psi | 87% | 2907 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,668 psi | 90% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,361 psi | 85% | 2933 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 45,818 psi | 71% | 2864 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 57,450 psi | 88% | 3025 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,028 psi | 86% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,101 psi | 86% | 3009 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 84% | 55,201 psi | 85% | 2930 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,824 psi | 84% | 2940 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,087 psi | 59% | 1952 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,262 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,608 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,723 psi | 84% | 3045 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,726 psi | 90% | 3068 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 55,999 psi | 86% | 2917 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 58,102 psi | 89% | 2982 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,738 psi | 86% | 2894 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,059 psi | 89% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,304 psi | 87% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,290 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,667 psi | 89% | 2979 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,725 psi | 89% | 2904 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 57,072 psi | 88% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,494 psi | 90% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,117 psi | 89% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,754 psi | 89% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,436 psi | 90% | 2933 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 57,058 psi | 88% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,116 psi | 88% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,029 psi | 88% | 3022 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 96% | 57,551 psi | 89% | 3002 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 54,723 psi | 84% | 2999 fps | 98% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 3058 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,537 psi | 89% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,724 psi | 86% | 2946 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,233 psi | 90% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,769 psi | 90% | 2949 fps | 99.8% |
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% | 37,927 psi | 58% | 2582 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 50,372 psi | 78% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 45,339 psi | 70% | 2818 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 41,843 psi | 64% | 2713 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 40,263 psi | 62% | 2703 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 90% | 39,131 psi | 60% | 2667 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 86% | 31,009 psi | 48% | 2507 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,153 psi | 74% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,887 psi | 64% | 2707 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,942 psi | 58% | 2651 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,521 psi | 56% | 2612 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,575 psi | 49% | 2523 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,901 psi | 63% | 2759 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,805 psi | 75% | 2913 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,285 psi | 79% | 2848 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 37,739 psi | 58% | 2644 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 38,537 psi | 59% | 2684 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,942 psi | 58% | 2651 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 52,373 psi | 81% | 2841 fps | 99.7% |
| Hodgdon H1000 | 81.5 gr | 86% | 37,318 psi | 57% | 2631 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 51,938 psi | 80% | 2887 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 54,244 psi | 83% | 2900 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 42,960 psi | 66% | 2710 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,177 psi | 65% | 2694 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,353 psi | 70% | 2723 fps | 100% |
| Hodgdon Retumbo | 79.2 gr | 84% | 35,375 psi | 54% | 2667 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 52,373 psi | 81% | 2913 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,601 psi | 73% | 2769 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,519 psi | 82% | 2861 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,819 psi | 74% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,408 psi | 64% | 2648 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,827 psi | 60% | 2680 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,436 psi | 61% | 2717 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 51,184 psi | 79% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,574 psi | 76% | 2802 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 32,648 psi | 50% | 2464 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 48,196 psi | 74% | 2812 fps | 98.5% |
| Norma 217 | <<locked>> | 90% | 32,111 psi | 49% | 2559 fps | 95% |
| Norma MRP | <<locked>> | 80% | 39,943 psi | 61% | 2720 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 49,081 psi | 76% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,537 psi | 59% | 2684 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 48,124 psi | 74% | 2818 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 34,592 psi | 53% | 2562 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 44% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,575 psi | 78% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,834 psi | 75% | 2874 fps | 100% |
| ReloadSwiss RS 76 | 82.8 gr | 82% | 32,372 psi | 50% | 2575 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,728 psi | 66% | 2792 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 43,105 psi | 66% | 2694 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,394 psi | 64% | 2694 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 52,373 psi | 81% | 2841 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,184 psi | 79% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,574 psi | 76% | 2802 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,154 psi | 77% | 2759 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,060 psi | 63% | 2690 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 43,990 psi | 68% | 2677 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 46,398 psi | 71% | 2776 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,018 psi | 65% | 2677 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 54,404 psi | 84% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,488 psi | 78% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,361 psi | 56% | 2546 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 50,053 psi | 77% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,901 psi | 63% | 2690 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,975 psi | 66% | 2772 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 86% | 40,698 psi | 63% | 2707 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 92% | 43,888 psi | 68% | 2808 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 51,692 psi | 80% | 2989 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,111 psi | 77% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,127 psi | 80% | 2890 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,315 psi | 51% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,522 psi | 59% | 2598 fps | 96.3% |
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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Nosler Ballistic Silver Tip. Hodgdon Retumbo delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,114 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 168.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 H1000, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Nosler Ballistic Silver Tip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.