Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | Berger Juggernaut Target bullet and 68 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% | 57,058 psi | 88% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,508 psi | 89% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,956 psi | 86% | 2897 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 58,436 psi | 90% | 2887 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,681 psi | 87% | 2897 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,216 psi | 85% | 2867 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,779 psi | 80% | 2897 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,523 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,059 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,072 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,740 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,114 psi | 85% | 2871 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,637 psi | 86% | 2887 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2949 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,508 psi | 89% | 2854 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 56,449 psi | 87% | 2881 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 54,868 psi | 84% | 2877 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,072 psi | 88% | 2890 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,639 psi | 90% | 2822 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,811 psi | 87% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,072 psi | 86% | 2835 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,769 psi | 90% | 2871 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,711 psi | 90% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,899 psi | 89% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 58% | 1831 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,116 psi | 88% | 2808 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,667 psi | 89% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,521 psi | 87% | 2815 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 54,969 psi | 85% | 2877 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,066 psi | 76% | 2802 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 57,305 psi | 88% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,666 psi | 86% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,726 psi | 90% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,581 psi | 90% | 2867 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,864 psi | 77% | 2825 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,188 psi | 88% | 2907 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,506 psi | 85% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,985 psi | 86% | 2897 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 58,421 psi | 90% | 2864 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,549 psi | 84% | 2828 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,696 psi | 89% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,376 psi | 87% | 2871 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,824 psi | 84% | 2936 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,653 psi | 90% | 2959 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 55,492 psi | 85% | 2802 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 57,609 psi | 89% | 2867 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,639 psi | 90% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,305 psi | 88% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,666 psi | 86% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,246 psi | 87% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,188 psi | 88% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,942 psi | 88% | 2792 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 56,898 psi | 88% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,204 psi | 90% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,232 psi | 88% | 2795 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,015 psi | 89% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,174 psi | 88% | 2831 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 56,420 psi | 87% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,072 psi | 88% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,681 psi | 87% | 2907 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 57,421 psi | 88% | 2894 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 54,969 psi | 85% | 2900 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 55,956 psi | 86% | 2956 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,811 psi | 87% | 2743 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,798 psi | 90% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,059 psi | 89% | 2831 fps | 100% |
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% | 40,625 psi | 63% | 2539 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 53,635 psi | 83% | 2769 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,003 psi | 65% | 2651 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,585 psi | 69% | 2664 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 39,914 psi | 61% | 2602 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 36,448 psi | 56% | 2516 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 98% | 48,037 psi | 74% | 2825 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 29,095 psi | 45% | 2365 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,314 psi | 79% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,585 psi | 69% | 2657 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,567 psi | 62% | 2608 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,320 psi | 61% | 2562 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,924 psi | 52% | 2490 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,295 psi | 68% | 2713 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,484 psi | 70% | 2753 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,616 psi | 73% | 2690 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 37,753 psi | 58% | 2549 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 36,187 psi | 56% | 2533 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 40,567 psi | 62% | 2608 fps | 97.9% |
| Bofors RP7 | <<locked>> | 80% | 54,911 psi | 85% | 2769 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,621 psi | 53% | 2474 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 42,569 psi | 66% | 2605 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,785 psi | 64% | 2589 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,254 psi | 74% | 2657 fps | 100% |
| Hodgdon Retumbo | 74.9 gr | 80% | 33,098 psi | 51% | 2516 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 43% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,299 psi | 77% | 2710 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,618 psi | 78% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,801 psi | 67% | 2602 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 38,595 psi | 59% | 2579 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,159 psi | 57% | 2572 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 53,867 psi | 83% | 2743 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,330 psi | 81% | 2740 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,012 psi | 54% | 2425 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 50,981 psi | 78% | 2756 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,429 psi | 47% | 2425 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 43,076 psi | 66% | 2680 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 52,083 psi | 80% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,508 psi | 59% | 2589 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 50,981 psi | 78% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,505 psi | 53% | 2470 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 44% | 1680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,925 psi | 83% | 2792 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,359 psi | 81% | 2815 fps | 100% |
| ReloadSwiss RS 76 | 80.2 gr | 80% | 32,401 psi | 50% | 2487 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,813 psi | 61% | 2635 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,629 psi | 70% | 2641 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 44,019 psi | 68% | 2644 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 54,911 psi | 85% | 2769 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,867 psi | 83% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,330 psi | 81% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,823 psi | 81% | 2694 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,671 psi | 67% | 2641 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 46,630 psi | 72% | 2628 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 49,676 psi | 76% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,585 psi | 69% | 2625 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 53,519 psi | 82% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,841 psi | 60% | 2503 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 94% | 53,490 psi | 82% | 2776 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 52,823 psi | 81% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,830 psi | 67% | 2638 fps | 100% |
| Vihtavuori N560 | 77.8 gr | 80% | 42,888 psi | 66% | 2671 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 38,043 psi | 59% | 2552 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 41,118 psi | 63% | 2651 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 48,443 psi | 75% | 2828 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,997 psi | 82% | 2697 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,753 psi | 57% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,973 psi | 63% | 2556 fps | 97.9% |
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 68 powders for .300 Rem. Ultra Mag. loaded with the .308 | 185gr | Berger Juggernaut Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,002 fps. ADI AR 2218 gives the best case fill at 100 %, and 68 of the 68 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 185.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 185gr | Berger Juggernaut Target 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.