Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | NorthFork Bonded Core bullet and 71 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 Accurate MAGPRO.
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% | 57,261 psi | 88% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,769 psi | 89% | 2963 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,130 psi | 86% | 3025 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 58,726 psi | 90% | 3022 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,826 psi | 87% | 3025 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 2986 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,806 psi | 77% | 2949 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,711 psi | 90% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,276 psi | 90% | 3009 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,130 psi | 88% | 3022 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,566 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,755 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,622 psi | 86% | 3025 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,117 psi | 89% | 2982 fps | 97.2% |
| Bofors RP15 | <<locked>> | 94% | 56,304 psi | 87% | 3009 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3061 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 57,130 psi | 88% | 3022 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 55,637 psi | 86% | 2910 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 56,927 psi | 88% | 3015 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 55,347 psi | 85% | 2959 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,769 psi | 89% | 2976 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 56,507 psi | 87% | 2963 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,303 psi | 85% | 2946 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,274 psi | 85% | 2890 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,551 psi | 89% | 3133 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,391 psi | 87% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 57% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,740 psi | 89% | 2949 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,971 psi | 88% | 2933 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,117 psi | 89% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,029 psi | 88% | 2946 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 92% | 54,998 psi | 85% | 3005 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,179 psi | 70% | 2851 fps | 97.5% |
| Lovex S065 | <<locked>> | 84% | 57,914 psi | 89% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,347 psi | 87% | 2927 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,494 psi | 90% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,172 psi | 85% | 2946 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 45,585 psi | 70% | 2877 fps | 99.3% |
| Norma MRP | <<locked>> | 90% | 57,290 psi | 88% | 3041 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,043 psi | 86% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,883 psi | 86% | 3025 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 84% | 54,955 psi | 85% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,621 psi | 84% | 2956 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 59% | 1972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,044 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,565 psi | 87% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,636 psi | 84% | 3061 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,508 psi | 90% | 3081 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,796 psi | 86% | 2933 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 57,798 psi | 89% | 2999 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,637 psi | 86% | 2910 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,914 psi | 89% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,347 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,130 psi | 88% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,392 psi | 88% | 2995 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 57,595 psi | 89% | 2920 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 57,058 psi | 88% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,363 psi | 90% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,001 psi | 89% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,566 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,291 psi | 90% | 2949 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,840 psi | 87% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,826 psi | 87% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,869 psi | 88% | 3038 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 57,319 psi | 88% | 3018 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 98% | 54,665 psi | 84% | 3015 fps | 97.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 3071 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,479 psi | 88% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,535 psi | 85% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,073 psi | 89% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,624 psi | 90% | 2966 fps | 99.8% |
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% | 37,797 psi | 58% | 2598 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 50,270 psi | 77% | 2854 fps | 100% |
| Accurate MAGPRO | 84.5 gr | 84% | 45,063 psi | 69% | 2828 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 41,742 psi | 64% | 2730 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 40,132 psi | 62% | 2717 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 90% | 39,073 psi | 60% | 2680 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 33,127 psi | 51% | 2582 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,051 psi | 74% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,800 psi | 64% | 2723 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,826 psi | 58% | 2664 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,448 psi | 56% | 2628 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,517 psi | 49% | 2536 fps | 97% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,712 psi | 63% | 2772 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,155 psi | 79% | 2864 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 37,637 psi | 58% | 2657 fps | 95.6% |
| Bofors RP30 | <<locked>> | 88% | 38,464 psi | 59% | 2697 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 37,826 psi | 58% | 2664 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 52,127 psi | 80% | 2854 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 37,188 psi | 57% | 2641 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 51,793 psi | 80% | 2904 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 54,128 psi | 83% | 2920 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,815 psi | 66% | 2723 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,047 psi | 65% | 2707 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,281 psi | 70% | 2740 fps | 100% |
| Hodgdon Retumbo | 79.9 gr | 84% | 35,215 psi | 54% | 2677 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 52,301 psi | 80% | 2933 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 43% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,529 psi | 73% | 2785 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,432 psi | 82% | 2877 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 47,558 psi | 73% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,350 psi | 64% | 2664 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 41,481 psi | 64% | 2759 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,305 psi | 60% | 2730 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,082 psi | 79% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,472 psi | 76% | 2818 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 32,489 psi | 50% | 2474 fps | 96.6% |
| Norma 204 | <<locked>> | 80% | 48,051 psi | 74% | 2828 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 34,418 psi | 53% | 2635 fps | 96% |
| Norma MRP | <<locked>> | 80% | 39,827 psi | 61% | 2733 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 48,979 psi | 75% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,392 psi | 59% | 2697 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 47,979 psi | 74% | 2835 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 34,447 psi | 53% | 2575 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,514 psi | 44% | 1772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,575 psi | 78% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,805 psi | 75% | 2894 fps | 100% |
| ReloadSwiss RS 76 | 83.5 gr | 82% | 32,227 psi | 50% | 2585 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,685 psi | 66% | 2805 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 43,004 psi | 66% | 2707 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,307 psi | 64% | 2710 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 80% | 52,127 psi | 80% | 2854 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,082 psi | 79% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,472 psi | 76% | 2818 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,053 psi | 77% | 2776 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,973 psi | 63% | 2707 fps | 97% |
| Somchem S361 | <<locked>> | 80% | 44,005 psi | 68% | 2694 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 46,296 psi | 71% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,901 psi | 64% | 2694 fps | 98% |
| Vihtavuori N150 | <<locked>> | 80% | 54,331 psi | 84% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,386 psi | 78% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,274 psi | 56% | 2562 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 49,922 psi | 77% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,654 psi | 63% | 2703 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,786 psi | 66% | 2785 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 40,495 psi | 62% | 2713 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 47,123 psi | 73% | 2887 fps | 96% |
| Vihtavuori N570 | <<locked>> | 98% | 51,634 psi | 79% | 3002 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,922 psi | 77% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,982 psi | 80% | 2907 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,170 psi | 51% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,406 psi | 59% | 2615 fps | 96.1% |
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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | NorthFork Bonded Core. Hodgdon Retumbo delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,133 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 165.0 gr projectile in 0.308" calls for a 1:13.0 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, Accurate MAGPRO rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 165gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.