Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC 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% | 56,231 psi | 87% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,608 psi | 87% | 2844 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,042 psi | 85% | 2913 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 57,667 psi | 89% | 2907 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,811 psi | 86% | 2913 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,175 psi | 90% | 2940 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,010 psi | 79% | 2907 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,794 psi | 81% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,595 psi | 89% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,130 psi | 88% | 2894 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,217 psi | 87% | 2910 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,885 psi | 89% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,928 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,665 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,188 psi | 86% | 2963 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,739 psi | 87% | 2871 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 55,405 psi | 85% | 2897 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 57,827 psi | 89% | 2953 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 56,217 psi | 87% | 2910 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,885 psi | 89% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,869 psi | 86% | 2904 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,030 psi | 89% | 2897 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,347 psi | 85% | 2851 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,986 psi | 89% | 2890 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,798 psi | 89% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,855 psi | 88% | 3022 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,391 psi | 58% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,521 psi | 87% | 2835 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,985 psi | 88% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,912 psi | 86% | 2831 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 57,928 psi | 89% | 2953 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2815 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 56,550 psi | 87% | 2808 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,595 psi | 90% | 2858 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,696 psi | 89% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,653 psi | 89% | 2884 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,849 psi | 75% | 2838 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,304 psi | 87% | 2927 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,465 psi | 90% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,013 psi | 85% | 2913 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 57,493 psi | 88% | 2881 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,928 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,927 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,390 psi | 85% | 2890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,073 psi | 89% | 3009 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,682 psi | 89% | 2972 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 58,392 psi | 90% | 2874 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,855 psi | 88% | 2887 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,885 psi | 89% | 2844 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,550 psi | 87% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,595 psi | 90% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,709 psi | 86% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,478 psi | 87% | 2881 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,275 psi | 87% | 2808 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 56,130 psi | 86% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,261 psi | 88% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,376 psi | 87% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,246 psi | 88% | 2838 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,304 psi | 87% | 2844 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 82% | 55,738 psi | 86% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,057 psi | 86% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,854 psi | 86% | 2927 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 56,507 psi | 87% | 2913 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 58,073 psi | 89% | 2976 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 55,056 psi | 85% | 2969 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,086 psi | 86% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,233 psi | 90% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,537 psi | 89% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,232 psi | 88% | 2851 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% | 39,929 psi | 61% | 2556 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 52,794 psi | 81% | 2792 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,350 psi | 64% | 2664 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,874 psi | 68% | 2680 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 39,407 psi | 61% | 2615 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 38,406 psi | 59% | 2585 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 47,369 psi | 73% | 2831 fps | 95% |
| ADI AR 2225 | <<locked>> | 84% | 30,560 psi | 47% | 2431 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,488 psi | 78% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,859 psi | 68% | 2671 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,987 psi | 62% | 2625 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,595 psi | 59% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,301 psi | 51% | 2500 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,526 psi | 67% | 2730 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,066 psi | 74% | 2828 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,920 psi | 72% | 2703 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 37,072 psi | 57% | 2559 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 35,563 psi | 55% | 2543 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,987 psi | 62% | 2625 fps | 97.5% |
| Bofors RP7 | <<locked>> | 80% | 54,389 psi | 84% | 2792 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 36,622 psi | 56% | 2549 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 54,288 psi | 84% | 2841 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,843 psi | 64% | 2615 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,249 psi | 63% | 2605 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,529 psi | 73% | 2677 fps | 100% |
| Hodgdon Retumbo | 75.2 gr | 80% | 32,503 psi | 50% | 2520 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 43% | 1660 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,574 psi | 76% | 2726 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,024 psi | 77% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,163 psi | 66% | 2615 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,058 psi | 59% | 2595 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,477 psi | 56% | 2582 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 53,171 psi | 82% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,605 psi | 79% | 2759 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,389 psi | 53% | 2438 fps | 98% |
| Norma 204 | <<locked>> | 80% | 50,357 psi | 78% | 2772 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 31,981 psi | 49% | 2487 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 42,250 psi | 65% | 2694 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 51,300 psi | 79% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,739 psi | 58% | 2598 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,372 psi | 78% | 2776 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,968 psi | 52% | 2480 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 44% | 1699 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,011 psi | 82% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,430 psi | 79% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 80.5 gr | 80% | 31,734 psi | 49% | 2493 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,134 psi | 65% | 2710 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 44,991 psi | 69% | 2657 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 43,453 psi | 67% | 2664 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 54,389 psi | 84% | 2792 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,171 psi | 82% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,605 psi | 79% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,127 psi | 80% | 2713 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,105 psi | 66% | 2657 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 45,934 psi | 71% | 2641 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 48,805 psi | 75% | 2730 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,034 psi | 68% | 2641 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 52,707 psi | 81% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,189 psi | 59% | 2516 fps | 97.5% |
| Vihtavuori N170 | <<locked>> | 94% | 52,678 psi | 81% | 2789 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 52,199 psi | 80% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,091 psi | 66% | 2654 fps | 100% |
| Vihtavuori N560 | 78.1 gr | 80% | 42,090 psi | 65% | 2680 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 84% | 40,001 psi | 62% | 2618 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 43,337 psi | 67% | 2726 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 96% | 51,053 psi | 79% | 2900 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,199 psi | 80% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,476 psi | 84% | 2844 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,955 psi | 55% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,451 psi | 62% | 2572 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 70 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,022 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 0.308" 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Alaska Bullet Works Kodiak SP SPBC 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.