Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .311 | 180gr | Sellier & Bellot SPRN bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 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>> | 90% | 58,552 psi | 90% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,667 psi | 89% | 2953 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 55,970 psi | 86% | 2884 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 58,334 psi | 90% | 2953 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 56,768 psi | 87% | 2920 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,447 psi | 82% | 2956 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,434 psi | 85% | 2936 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,130 psi | 86% | 2881 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,028 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,521 psi | 85% | 2871 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,711 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,478 psi | 87% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,739 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,392 psi | 88% | 2940 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,911 psi | 85% | 2943 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,303 psi | 85% | 2851 fps | 97.6% |
| Bofors RP15 | <<locked>> | 92% | 57,856 psi | 89% | 2933 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,565 psi | 87% | 2933 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 58,711 psi | 90% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 58,421 psi | 90% | 2943 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,479 psi | 88% | 2887 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,304 psi | 87% | 2871 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,115 psi | 86% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,753 psi | 86% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 58% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,392 psi | 90% | 2861 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,187 psi | 85% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,725 psi | 89% | 2864 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 56,478 psi | 87% | 2933 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,807 psi | 78% | 2858 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 58,320 psi | 90% | 2838 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,884 psi | 88% | 2838 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,333 psi | 87% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,999 psi | 86% | 2864 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,677 psi | 80% | 2881 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,882 psi | 84% | 2904 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,797 psi | 87% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,711 psi | 89% | 2953 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,941 psi | 86% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,405 psi | 87% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,667 psi | 89% | 2920 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,797 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,304 psi | 87% | 2953 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 86% | 56,637 psi | 87% | 2854 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 55,245 psi | 85% | 2864 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,320 psi | 90% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,884 psi | 88% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,348 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,610 psi | 90% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,291 psi | 90% | 2844 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 58,392 psi | 90% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,622 psi | 86% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,465 psi | 90% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,579 psi | 86% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 57,696 psi | 89% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,392 psi | 90% | 2884 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,276 psi | 90% | 2963 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 55,288 psi | 85% | 2894 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 96% | 56,782 psi | 87% | 2956 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 98% | 58,001 psi | 89% | 3015 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,030 psi | 89% | 2792 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,507 psi | 87% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,535 psi | 85% | 2828 fps | 99.9% |
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% | 41,611 psi | 64% | 2589 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 43,163 psi | 66% | 2700 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 45,629 psi | 70% | 2713 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,988 psi | 63% | 2651 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 37,405 psi | 58% | 2566 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 49,705 psi | 76% | 2887 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 82% | 29,892 psi | 46% | 2411 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,992 psi | 71% | 2713 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,388 psi | 81% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,556 psi | 70% | 2707 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,684 psi | 64% | 2657 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,277 psi | 62% | 2605 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,853 psi | 54% | 2539 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,600 psi | 70% | 2762 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,108 psi | 73% | 2808 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,513 psi | 70% | 2677 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,740 psi | 60% | 2595 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 37,347 psi | 57% | 2582 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 41,684 psi | 64% | 2657 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 35,505 psi | 55% | 2523 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,613 psi | 67% | 2654 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,844 psi | 66% | 2638 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,284 psi | 76% | 2703 fps | 100% |
| Hodgdon Retumbo | 77.9 gr | 80% | 33,982 psi | 52% | 2562 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 43% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,285 psi | 79% | 2756 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 51,750 psi | 80% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,672 psi | 69% | 2648 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 39,697 psi | 61% | 2631 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,824 psi | 55% | 2562 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 54,795 psi | 84% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,417 psi | 82% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,824 psi | 55% | 2467 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 52,286 psi | 80% | 2808 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 31,444 psi | 48% | 2470 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 44,193 psi | 68% | 2726 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 53,258 psi | 82% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,566 psi | 61% | 2638 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 52,301 psi | 80% | 2808 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,592 psi | 55% | 2520 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,708 psi | 83% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 80% | 33,301 psi | 51% | 2536 fps | 97.3% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,292 psi | 64% | 2687 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 46,485 psi | 72% | 2687 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 45,092 psi | 69% | 2694 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,795 psi | 84% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,417 psi | 82% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,766 psi | 83% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,744 psi | 69% | 2690 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 47,616 psi | 73% | 2677 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 50,879 psi | 78% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,687 psi | 70% | 2674 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 54,607 psi | 84% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,740 psi | 61% | 2549 fps | 98.1% |
| Vihtavuori N550 | <<locked>> | 80% | 53,983 psi | 83% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,846 psi | 69% | 2684 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,947 psi | 68% | 2720 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 39,030 psi | 60% | 2595 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 42,351 psi | 65% | 2703 fps | 95.6% |
| Vihtavuori N570 | 95.1 gr | 94% | 50,154 psi | 77% | 2884 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,099 psi | 83% | 2743 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,232 psi | 59% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,032 psi | 65% | 2605 fps | 98.1% |
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 64 powders for .300 Rem. Ultra Mag. loaded with the .311 | 180gr | Sellier & Bellot SPRN. Vihtavuori N570 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,015 fps. ADI AR 2218 gives the best case fill at 100 %, and 64 of the 64 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 0.311" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .311 | 180gr | Sellier & Bellot SPRN 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.