Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Speer Gold Dot bullet and 72 powders. The key underlying parameters are shown in the table above.
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% | 55,129 psi | 85% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,506 psi | 85% | 2910 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,739 psi | 87% | 3031 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 90% | 57,870 psi | 89% | 3031 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,507 psi | 87% | 2969 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 58,581 psi | 90% | 3035 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,985 psi | 88% | 2999 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,561 psi | 79% | 2959 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,637 psi | 87% | 2966 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,449 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,985 psi | 86% | 2956 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,056 psi | 85% | 2972 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,666 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,608 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,566 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 3012 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,927 psi | 86% | 2930 fps | 97.1% |
| Bofors RP15 | <<locked>> | 94% | 57,986 psi | 89% | 3015 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,434 psi | 87% | 3009 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 55,056 psi | 85% | 2972 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 56,811 psi | 87% | 2910 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 54,607 psi | 84% | 2963 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 56,826 psi | 87% | 2963 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,088 psi | 89% | 2969 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,898 psi | 88% | 2953 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,637 psi | 87% | 2887 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,434 psi | 85% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,928 psi | 89% | 2995 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,275 psi | 57% | 1916 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,492 psi | 85% | 2897 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,131 psi | 89% | 2930 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,840 psi | 86% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,479 psi | 90% | 2949 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 56,782 psi | 87% | 3012 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,978 psi | 72% | 2864 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 55,680 psi | 86% | 2881 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,551 psi | 89% | 2927 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,521 psi | 87% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,594 psi | 87% | 2949 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 47,558 psi | 73% | 2890 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 55,027 psi | 85% | 2989 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,334 psi | 88% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,059 psi | 89% | 3035 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,405 psi | 87% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,565 psi | 87% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,261 psi | 59% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,811 psi | 86% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,392 psi | 90% | 3012 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,623 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,173 psi | 86% | 3028 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 57,363 psi | 88% | 2940 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 88% | 55,724 psi | 86% | 2949 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 56,811 psi | 87% | 2910 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,680 psi | 86% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,551 psi | 89% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,450 psi | 90% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,303 psi | 85% | 2943 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 55,259 psi | 85% | 2867 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 58,711 psi | 90% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,260 psi | 87% | 2920 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 55,347 psi | 85% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,072 psi | 86% | 2900 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 58,465 psi | 90% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,682 psi | 90% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,581 psi | 90% | 3045 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 55,419 psi | 85% | 2969 fps | 99% |
| Vihtavuori N568 | <<locked>> | 98% | 56,608 psi | 87% | 3028 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 3084 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,027 psi | 85% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,029 psi | 88% | 2966 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,999 psi | 86% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,130 psi | 86% | 2910 fps | 99.7% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,073 psi | 60% | 2608 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 51,808 psi | 80% | 2858 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,627 psi | 66% | 2776 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 82% | 43,265 psi | 67% | 2776 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,047 psi | 66% | 2736 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 41,205 psi | 63% | 2723 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 40,219 psi | 62% | 2694 fps | 96% |
| ADI AR 2225 | <<locked>> | 86% | 31,966 psi | 49% | 2533 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,439 psi | 67% | 2736 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,443 psi | 76% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,062 psi | 66% | 2730 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,972 psi | 60% | 2671 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,637 psi | 58% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,590 psi | 50% | 2546 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,235 psi | 65% | 2782 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,662 psi | 78% | 2943 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,168 psi | 76% | 2812 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,187 psi | 56% | 2608 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,130 psi | 57% | 2648 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 38,972 psi | 60% | 2671 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 53,272 psi | 82% | 2858 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,276 psi | 59% | 2651 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,243 psi | 82% | 2907 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,002 psi | 63% | 2671 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,120 psi | 66% | 2713 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,557 psi | 72% | 2740 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 33,997 psi | 52% | 2628 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 53,780 psi | 83% | 2933 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 43% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,791 psi | 75% | 2789 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,563 psi | 84% | 2877 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,950 psi | 75% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,467 psi | 65% | 2674 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 39,798 psi | 61% | 2703 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,985 psi | 58% | 2680 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 52,272 psi | 80% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,647 psi | 78% | 2822 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,533 psi | 52% | 2484 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 49,385 psi | 76% | 2835 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,228 psi | 51% | 2585 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,176 psi | 63% | 2743 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 50,256 psi | 77% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,682 psi | 61% | 2710 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,371 psi | 76% | 2838 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,040 psi | 51% | 2523 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 44% | 1765 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,880 psi | 80% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,328 psi | 77% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 33,388 psi | 51% | 2602 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,440 psi | 68% | 2822 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,106 psi | 68% | 2713 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,482 psi | 65% | 2717 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 53,272 psi | 82% | 2858 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,272 psi | 80% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,647 psi | 78% | 2822 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,155 psi | 79% | 2776 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,134 psi | 65% | 2713 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 45,121 psi | 69% | 2697 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 47,834 psi | 74% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,004 psi | 66% | 2697 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 80% | 51,822 psi | 80% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,434 psi | 58% | 2569 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,097 psi | 79% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,090 psi | 65% | 2710 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,075 psi | 63% | 2730 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 41,945 psi | 65% | 2730 fps | 96% |
| Vihtavuori N568 | <<locked>> | 92% | 45,484 psi | 70% | 2838 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 53,563 psi | 82% | 3018 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,213 psi | 79% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,432 psi | 82% | 2910 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,737 psi | 53% | 2664 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,450 psi | 61% | 2618 fps | 96.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Speer Gold Dot. Vihtavuori N570 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,084 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 168.0 gr projectile in 0.308" calls for a 1:14.5 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.