Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Sellier & Bellot HPBT 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 Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
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% | 57,957 psi | 89% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,392 psi | 90% | 2953 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,840 psi | 87% | 3018 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 55,666 psi | 86% | 2959 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 57,537 psi | 89% | 3018 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,840 psi | 86% | 2979 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,502 psi | 78% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,622 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,187 psi | 85% | 2943 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,812 psi | 89% | 3012 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,579 psi | 86% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,521 psi | 85% | 2989 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,405 psi | 87% | 3015 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 2992 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,668 psi | 90% | 2972 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 56,971 psi | 88% | 2999 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 55,405 psi | 85% | 2992 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 57,812 psi | 89% | 3012 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 56,115 psi | 86% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 57,667 psi | 89% | 3009 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 56,144 psi | 86% | 2953 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,349 psi | 90% | 2966 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,116 psi | 88% | 2956 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,898 psi | 86% | 2936 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,912 psi | 86% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,363 psi | 90% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,058 psi | 88% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1913 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,276 psi | 90% | 2936 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,435 psi | 88% | 2920 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,711 psi | 90% | 2940 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,580 psi | 89% | 2936 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 55,709 psi | 86% | 2999 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,876 psi | 71% | 2844 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 58,465 psi | 90% | 2920 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,913 psi | 88% | 2917 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,463 psi | 85% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,753 psi | 86% | 2940 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 46,369 psi | 71% | 2874 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 58,015 psi | 89% | 3031 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,608 psi | 87% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,681 psi | 87% | 3018 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 55,564 psi | 86% | 2936 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,405 psi | 85% | 2946 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,174 psi | 59% | 1959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,682 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,246 psi | 88% | 2999 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,463 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,839 psi | 84% | 3009 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 56,347 psi | 87% | 2923 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 58,697 psi | 90% | 2992 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 56,115 psi | 86% | 2897 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,465 psi | 90% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,913 psi | 88% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,667 psi | 89% | 2871 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,262 psi | 90% | 2986 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 58,175 psi | 90% | 2910 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 57,711 psi | 89% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,259 psi | 85% | 2904 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 58,523 psi | 90% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,175 psi | 90% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,114 psi | 85% | 2884 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 57,609 psi | 89% | 2930 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,522 psi | 89% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,566 psi | 89% | 3031 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 58,059 psi | 89% | 3012 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 98% | 55,463 psi | 85% | 3012 fps | 98.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,521 psi | 87% | 3068 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,073 psi | 89% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,144 psi | 86% | 2953 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,476 psi | 84% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,158 psi | 85% | 2897 fps | 99.6% |
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% | 38,290 psi | 59% | 2592 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 50,807 psi | 78% | 2841 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,482 psi | 65% | 2759 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 42,221 psi | 65% | 2720 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 40,582 psi | 62% | 2713 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 90% | 39,581 psi | 61% | 2677 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 31,386 psi | 48% | 2516 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,617 psi | 75% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,235 psi | 65% | 2713 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,290 psi | 59% | 2657 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,912 psi | 57% | 2618 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,894 psi | 49% | 2530 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,336 psi | 64% | 2766 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,429 psi | 76% | 2923 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,472 psi | 75% | 2799 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 35,520 psi | 55% | 2592 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 39,015 psi | 60% | 2690 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 38,290 psi | 59% | 2657 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 52,765 psi | 81% | 2848 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 37,623 psi | 58% | 2638 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 52,373 psi | 81% | 2894 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,621 psi | 84% | 2907 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 43,279 psi | 67% | 2717 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,511 psi | 65% | 2700 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,788 psi | 70% | 2730 fps | 100% |
| Hodgdon Retumbo | 79.9 gr | 84% | 35,810 psi | 55% | 2677 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 52,953 psi | 81% | 2923 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 43% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,964 psi | 74% | 2776 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,896 psi | 83% | 2864 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,225 psi | 74% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,742 psi | 64% | 2657 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 39,160 psi | 60% | 2690 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,885 psi | 61% | 2726 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 51,576 psi | 79% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,951 psi | 77% | 2808 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,909 psi | 51% | 2467 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 48,544 psi | 75% | 2818 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 32,532 psi | 50% | 2569 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 40,350 psi | 62% | 2730 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 49,501 psi | 76% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,885 psi | 60% | 2694 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 48,515 psi | 75% | 2825 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 34,896 psi | 54% | 2572 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,140 psi | 79% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,458 psi | 76% | 2884 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 82% | 32,648 psi | 50% | 2582 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,366 psi | 67% | 2805 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 43,468 psi | 67% | 2700 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 41,771 psi | 64% | 2703 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 52,765 psi | 81% | 2848 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,576 psi | 79% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,951 psi | 77% | 2808 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,517 psi | 78% | 2766 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,452 psi | 64% | 2700 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 44,440 psi | 68% | 2684 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 46,847 psi | 72% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,366 psi | 65% | 2684 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 80% | 54,810 psi | 84% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,894 psi | 78% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,680 psi | 56% | 2552 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,415 psi | 78% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,336 psi | 64% | 2697 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 43,308 psi | 67% | 2779 fps | 96% |
| Vihtavuori N565 | <<locked>> | 86% | 41,017 psi | 63% | 2710 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 44,527 psi | 69% | 2818 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 98% | 52,417 psi | 81% | 2999 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,430 psi | 78% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,504 psi | 81% | 2897 fps | 99.9% |
| Winchester StaBALL HD | 78.1 gr | 80% | 33,794 psi | 52% | 2648 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,841 psi | 60% | 2608 fps | 96.5% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Sellier & Bellot HPBT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,127 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 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, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Sellier & Bellot HPBT 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.