Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .311 | 180gr | Sierra Pro-Hunter 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% | 57,276 psi | 88% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,624 psi | 89% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,260 psi | 87% | 2930 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 58,523 psi | 90% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,840 psi | 87% | 2930 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,448 psi | 85% | 2900 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,054 psi | 80% | 2930 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,896 psi | 83% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,595 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,117 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,232 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,129 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,230 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,796 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,464 psi | 88% | 2979 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,667 psi | 89% | 2884 fps | 98% |
| Bofors RP15 | <<locked>> | 92% | 56,405 psi | 87% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,143 psi | 85% | 2910 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,232 psi | 88% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,537 psi | 90% | 2854 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,043 psi | 88% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,115 psi | 86% | 2864 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,129 psi | 85% | 2851 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,740 psi | 90% | 2828 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,175 psi | 90% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,101 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,899 psi | 89% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,608 psi | 87% | 2844 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 55,187 psi | 85% | 2910 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2831 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,392 psi | 88% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,767 psi | 86% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,726 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,697 psi | 90% | 2904 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,038 psi | 77% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,377 psi | 88% | 2940 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,608 psi | 86% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,333 psi | 87% | 2933 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,552 psi | 90% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,781 psi | 84% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,812 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,478 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,143 psi | 85% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,578 psi | 84% | 2927 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 86% | 55,448 psi | 85% | 2835 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 57,696 psi | 89% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,537 psi | 90% | 2854 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,392 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,767 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,492 psi | 87% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,305 psi | 88% | 2894 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 57,101 psi | 88% | 2825 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 56,913 psi | 88% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,276 psi | 90% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,290 psi | 88% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,175 psi | 90% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,305 psi | 88% | 2861 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 82% | 56,594 psi | 87% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,000 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,855 psi | 88% | 2940 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 57,682 psi | 89% | 2927 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,085 psi | 85% | 2930 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 56,188 psi | 86% | 2986 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,855 psi | 88% | 2776 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,708 psi | 84% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,233 psi | 90% | 2864 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% | 40,727 psi | 63% | 2569 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,795 psi | 83% | 2805 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,119 psi | 65% | 2680 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,686 psi | 69% | 2697 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,001 psi | 62% | 2628 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,579 psi | 56% | 2546 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 48,356 psi | 74% | 2854 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 29,138 psi | 45% | 2388 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,285 psi | 79% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,657 psi | 69% | 2687 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,640 psi | 63% | 2638 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,305 psi | 60% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,011 psi | 52% | 2520 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,425 psi | 68% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,255 psi | 76% | 2848 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,601 psi | 73% | 2717 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,855 psi | 58% | 2575 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 36,332 psi | 56% | 2562 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,640 psi | 63% | 2638 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 55,056 psi | 85% | 2805 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,664 psi | 53% | 2500 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,598 psi | 66% | 2635 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,872 psi | 64% | 2618 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,283 psi | 74% | 2687 fps | 100% |
| Hodgdon Retumbo | 76.4 gr | 80% | 33,170 psi | 51% | 2539 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 43% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,415 psi | 78% | 2743 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,734 psi | 78% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,903 psi | 68% | 2631 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,682 psi | 60% | 2608 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,304 psi | 57% | 2598 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,838 psi | 83% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,460 psi | 81% | 2772 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,070 psi | 54% | 2451 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 51,198 psi | 79% | 2789 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,429 psi | 47% | 2444 fps | 95% |
| Norma MRP | <<locked>> | 80% | 43,105 psi | 66% | 2707 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,214 psi | 80% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,522 psi | 59% | 2615 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 51,242 psi | 79% | 2792 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,664 psi | 53% | 2497 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,925 psi | 83% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,359 psi | 81% | 2848 fps | 100% |
| ReloadSwiss RS 76 | 81.8 gr | 80% | 32,474 psi | 50% | 2513 fps | 96.8% |
| ReloadSwiss RS 80 | 90.7 gr | 88% | 40,030 psi | 62% | 2664 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,614 psi | 70% | 2671 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,135 psi | 68% | 2677 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 80% | 55,056 psi | 85% | 2805 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,838 psi | 83% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,460 psi | 81% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,765 psi | 81% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,787 psi | 67% | 2671 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 46,586 psi | 72% | 2654 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 49,821 psi | 77% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,643 psi | 69% | 2654 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,606 psi | 83% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,914 psi | 60% | 2533 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 94% | 53,650 psi | 83% | 2805 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 52,881 psi | 81% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,830 psi | 67% | 2664 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,902 psi | 66% | 2697 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 38,072 psi | 59% | 2575 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,249 psi | 63% | 2680 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 48,617 psi | 75% | 2858 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,127 psi | 82% | 2730 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,927 psi | 57% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,031 psi | 63% | 2582 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 .311 | 180gr | Sierra Pro-Hunter. 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 0.311" calls for a 1:14.5 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 .311 | 180gr | Sierra Pro-Hunter 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.