Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .310 | 175gr | Rhino Penetrator bullet and 73 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% | 58,044 psi | 89% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,595 psi | 90% | 2904 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,898 psi | 88% | 2972 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 55,753 psi | 86% | 2907 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 57,856 psi | 89% | 2976 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,999 psi | 86% | 2936 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,517 psi | 78% | 2897 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,927 psi | 86% | 2907 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,738 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,303 psi | 85% | 2897 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,160 psi | 90% | 2969 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,825 psi | 86% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,738 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,420 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2953 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,798 psi | 90% | 2927 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 57,101 psi | 88% | 2953 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 55,550 psi | 85% | 2949 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 58,160 psi | 90% | 2969 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,347 psi | 87% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,827 psi | 89% | 2963 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,333 psi | 87% | 2904 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,450 psi | 90% | 2913 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,188 psi | 88% | 2910 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,159 psi | 86% | 2894 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,043 psi | 86% | 2828 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,537 psi | 90% | 3077 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,130 psi | 88% | 2936 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 57% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,523 psi | 90% | 2890 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,682 psi | 89% | 2871 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,100 psi | 85% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,740 psi | 89% | 2890 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 55,825 psi | 86% | 2953 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,977 psi | 71% | 2805 fps | 98.1% |
| Lovex S065 | <<locked>> | 84% | 58,740 psi | 90% | 2871 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,014 psi | 88% | 2867 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,709 psi | 86% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,043 psi | 86% | 2894 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 46,528 psi | 72% | 2831 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 58,189 psi | 90% | 2986 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,753 psi | 87% | 2887 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,971 psi | 88% | 2972 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 55,840 psi | 86% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,521 psi | 85% | 2900 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,955 psi | 85% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,450 psi | 88% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,593 psi | 86% | 3012 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,042 psi | 85% | 2966 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 56,652 psi | 87% | 2881 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 88% | 54,940 psi | 85% | 2887 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 56,347 psi | 87% | 2851 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,740 psi | 90% | 2871 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,014 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,812 psi | 89% | 2825 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,465 psi | 90% | 2940 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 58,291 psi | 90% | 2867 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 58,001 psi | 89% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,434 psi | 85% | 2858 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 58,769 psi | 90% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,349 psi | 90% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,216 psi | 85% | 2838 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 57,638 psi | 89% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,914 psi | 89% | 2910 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,740 psi | 89% | 2986 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 58,421 psi | 90% | 2969 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 55,550 psi | 85% | 2969 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,710 psi | 87% | 3025 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,291 psi | 90% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,536 psi | 87% | 2907 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,781 psi | 84% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,419 psi | 85% | 2854 fps | 99.7% |
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% | 38,479 psi | 59% | 2552 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 51,039 psi | 79% | 2799 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,728 psi | 66% | 2720 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 42,395 psi | 65% | 2677 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 40,683 psi | 63% | 2671 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 37,130 psi | 57% | 2579 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 31,459 psi | 48% | 2480 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,815 psi | 66% | 2677 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,762 psi | 75% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,424 psi | 65% | 2671 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,522 psi | 59% | 2621 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,043 psi | 57% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,039 psi | 49% | 2493 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,582 psi | 64% | 2726 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,676 psi | 76% | 2884 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,704 psi | 75% | 2759 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 35,694 psi | 55% | 2556 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 36,550 psi | 56% | 2595 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 38,522 psi | 59% | 2621 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 52,881 psi | 81% | 2799 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,840 psi | 58% | 2602 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 52,649 psi | 81% | 2848 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,882 psi | 84% | 2861 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 40,480 psi | 62% | 2615 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,641 psi | 66% | 2661 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,905 psi | 71% | 2680 fps | 100% |
| Hodgdon Retumbo | 76.2 gr | 82% | 33,547 psi | 52% | 2575 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 53,113 psi | 82% | 2874 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 43% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,138 psi | 74% | 2730 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,215 psi | 83% | 2822 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,414 psi | 75% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,887 psi | 64% | 2615 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 39,291 psi | 60% | 2648 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,391 psi | 58% | 2631 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 51,692 psi | 80% | 2769 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,096 psi | 77% | 2766 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,069 psi | 51% | 2431 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 48,849 psi | 75% | 2779 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 32,692 psi | 50% | 2536 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 40,654 psi | 63% | 2690 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 49,661 psi | 76% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,088 psi | 60% | 2654 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 48,820 psi | 75% | 2782 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 32,532 psi | 50% | 2474 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,300 psi | 79% | 2818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,647 psi | 76% | 2838 fps | 100% |
| ReloadSwiss RS 76 | 79.6 gr | 80% | 30,574 psi | 47% | 2480 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,555 psi | 67% | 2769 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 43,598 psi | 67% | 2657 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,959 psi | 65% | 2661 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 52,881 psi | 81% | 2799 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,692 psi | 80% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,096 psi | 77% | 2766 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,720 psi | 78% | 2720 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,626 psi | 64% | 2657 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 44,614 psi | 69% | 2644 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 47,094 psi | 72% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,598 psi | 66% | 2644 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 54,955 psi | 85% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 51,111 psi | 79% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,854 psi | 57% | 2516 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 50,662 psi | 78% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,481 psi | 64% | 2654 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,582 psi | 62% | 2677 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 84% | 38,508 psi | 59% | 2615 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 44,643 psi | 69% | 2779 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 52,489 psi | 81% | 2956 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,662 psi | 78% | 2726 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,823 psi | 81% | 2851 fps | 99.9% |
| Winchester StaBALL HD | 76.4 gr | 80% | 34,084 psi | 52% | 2612 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,928 psi | 60% | 2566 fps | 96.8% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .310 | 175gr | Rhino Penetrator. Hodgdon Retumbo delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,077 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 175.0 gr projectile in 0.31" calls for a 1:12.0 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 .310 | 175gr | Rhino Penetrator 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.