Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .311 | 182gr | Prvi Partizan FMJ BT bullet and 70 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 Vihtavuori N560.
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% | 56,130 psi | 86% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,608 psi | 87% | 2828 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,969 psi | 85% | 2897 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 57,537 psi | 89% | 2890 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,738 psi | 86% | 2900 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 2923 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,894 psi | 78% | 2894 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,649 psi | 81% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,566 psi | 89% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,188 psi | 88% | 2881 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,144 psi | 86% | 2894 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,754 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,856 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,563 psi | 84% | 2890 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,057 psi | 86% | 2949 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,710 psi | 87% | 2854 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 55,492 psi | 85% | 2884 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 57,841 psi | 89% | 2940 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,144 psi | 86% | 2894 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,856 psi | 89% | 2828 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,869 psi | 86% | 2890 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,030 psi | 89% | 2881 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,230 psi | 85% | 2835 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,899 psi | 89% | 2877 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,812 psi | 89% | 2802 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,826 psi | 87% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 58% | 1841 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,318 psi | 87% | 2815 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,797 psi | 87% | 2818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,753 psi | 86% | 2818 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 58,044 psi | 89% | 2940 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,080 psi | 74% | 2802 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 56,521 psi | 87% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,595 psi | 90% | 2844 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,798 psi | 89% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,711 psi | 89% | 2871 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,805 psi | 75% | 2828 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,217 psi | 87% | 2913 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,479 psi | 90% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,926 psi | 85% | 2897 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 57,537 psi | 89% | 2867 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,914 psi | 89% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 59% | 1883 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,768 psi | 87% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,405 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,102 psi | 89% | 2999 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,551 psi | 89% | 2959 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 58,247 psi | 90% | 2861 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,724 psi | 87% | 2871 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,856 psi | 89% | 2828 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,521 psi | 87% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,595 psi | 90% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,680 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,304 psi | 87% | 2867 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,173 psi | 86% | 2795 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 55,912 psi | 86% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,334 psi | 88% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,362 psi | 87% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,145 psi | 88% | 2825 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,333 psi | 87% | 2835 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,767 psi | 86% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,115 psi | 86% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,738 psi | 86% | 2910 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 56,492 psi | 87% | 2897 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 57,928 psi | 89% | 2959 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 54,868 psi | 84% | 2953 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,985 psi | 86% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,247 psi | 90% | 2884 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,508 psi | 89% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,188 psi | 88% | 2838 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% | 39,900 psi | 61% | 2543 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 52,750 psi | 81% | 2776 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,205 psi | 63% | 2651 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,830 psi | 67% | 2667 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,378 psi | 61% | 2602 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 35,795 psi | 55% | 2513 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 47,239 psi | 73% | 2818 fps | 95% |
| ADI AR 2225 | <<locked>> | 84% | 30,574 psi | 47% | 2421 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,430 psi | 78% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,830 psi | 67% | 2657 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,958 psi | 61% | 2612 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,537 psi | 59% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,257 psi | 51% | 2487 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,366 psi | 67% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,906 psi | 74% | 2815 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,978 psi | 72% | 2690 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,043 psi | 57% | 2546 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 35,563 psi | 55% | 2533 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,958 psi | 61% | 2612 fps | 97.5% |
| Bofors RP7 | <<locked>> | 80% | 54,331 psi | 84% | 2779 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 36,506 psi | 56% | 2533 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 54,288 psi | 84% | 2828 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,843 psi | 64% | 2605 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,220 psi | 63% | 2592 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,456 psi | 73% | 2661 fps | 100% |
| Hodgdon Retumbo | 74.6 gr | 80% | 32,489 psi | 50% | 2510 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 43% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,530 psi | 76% | 2713 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 49,980 psi | 77% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,134 psi | 66% | 2602 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,029 psi | 59% | 2582 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,390 psi | 56% | 2569 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 53,113 psi | 82% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,561 psi | 79% | 2743 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,345 psi | 53% | 2425 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 50,372 psi | 78% | 2762 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 31,865 psi | 49% | 2477 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 42,250 psi | 65% | 2680 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 51,256 psi | 79% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,739 psi | 58% | 2585 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,386 psi | 78% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,953 psi | 52% | 2470 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 44% | 1690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,040 psi | 82% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,474 psi | 79% | 2822 fps | 100% |
| ReloadSwiss RS 76 | 79.9 gr | 80% | 31,763 psi | 49% | 2484 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,105 psi | 65% | 2697 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,947 psi | 69% | 2644 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 43,424 psi | 67% | 2651 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 54,331 psi | 84% | 2779 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,113 psi | 82% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,561 psi | 79% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,098 psi | 80% | 2700 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,091 psi | 66% | 2648 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 45,934 psi | 71% | 2631 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 48,762 psi | 75% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,005 psi | 68% | 2628 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 52,663 psi | 81% | 2749 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,159 psi | 59% | 2503 fps | 97.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,504 psi | 81% | 2776 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 52,199 psi | 80% | 2756 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,018 psi | 66% | 2638 fps | 100% |
| Vihtavuori N560 | 77.5 gr | 80% | 42,090 psi | 65% | 2671 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 37,347 psi | 57% | 2549 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 43,279 psi | 67% | 2710 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 51,068 psi | 79% | 2890 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,214 psi | 80% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,462 psi | 84% | 2831 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,911 psi | 55% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,277 psi | 62% | 2556 fps | 97.6% |
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 75 powders for .300 Rem. Ultra Mag. loaded with the .311 | 182gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,005 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 182.0 gr projectile in 0.311" 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 Retumbo, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .311 | 182gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, 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.