Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 160gr | Peregrine VRG-3 Lever 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, Winchester StaBALL HD and ReloadSwiss RS 76.
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% | 55,013 psi | 85% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,521 psi | 85% | 2972 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,131 psi | 89% | 3094 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 57,072 psi | 88% | 3038 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 55,027 psi | 85% | 3035 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 2995 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,761 psi | 74% | 2946 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,884 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,276 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,637 psi | 87% | 3025 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,172 psi | 85% | 3028 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,565 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,579 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,537 psi | 89% | 3087 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,782 psi | 87% | 2992 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 58,189 psi | 90% | 3074 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,289 psi | 87% | 3064 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 55,172 psi | 85% | 3028 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 57,696 psi | 89% | 2982 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 54,940 psi | 85% | 3022 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 57,479 psi | 88% | 3031 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,173 psi | 86% | 2989 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 58,711 psi | 90% | 3035 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,435 psi | 88% | 3015 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,072 psi | 88% | 2953 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,376 psi | 85% | 3136 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,389 psi | 84% | 3002 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 57% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,072 psi | 86% | 2963 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,521 psi | 85% | 2953 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 56,115 psi | 86% | 2966 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,550 psi | 85% | 2959 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 57,072 psi | 88% | 3077 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,018 psi | 66% | 2844 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 56,217 psi | 87% | 2946 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,233 psi | 90% | 2995 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,260 psi | 87% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,363 psi | 88% | 3018 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 43,497 psi | 67% | 2871 fps | 98.7% |
| Norma MRP | <<locked>> | 90% | 55,230 psi | 85% | 3051 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 57,986 psi | 89% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,204 psi | 90% | 3097 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,971 psi | 88% | 3018 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,884 psi | 88% | 3025 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 58% | 2001 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,101 psi | 86% | 2995 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,708 psi | 84% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,695 psi | 87% | 3130 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 3081 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 90% | 58,044 psi | 89% | 3005 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 56,014 psi | 86% | 3012 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 57,696 psi | 89% | 2982 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,217 psi | 87% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,233 psi | 90% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,479 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,405 psi | 85% | 2897 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,593 psi | 86% | 3005 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 58,494 psi | 90% | 2969 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,883 psi | 86% | 2933 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 54,940 psi | 85% | 2959 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,492 psi | 87% | 2982 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,304 psi | 87% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,782 psi | 86% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,405 psi | 87% | 2959 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,172 psi | 85% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,639 psi | 90% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,911 psi | 85% | 3045 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 55,259 psi | 85% | 3025 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 3084 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,651 psi | 86% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,667 psi | 89% | 3035 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,477 psi | 85% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,768 psi | 87% | 2976 fps | 99.6% |
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% | 35,868 psi | 55% | 2592 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 48,196 psi | 74% | 2861 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,557 psi | 72% | 2894 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 40,234 psi | 62% | 2733 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 84% | 41,350 psi | 64% | 2779 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 40,132 psi | 62% | 2740 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 33,692 psi | 52% | 2628 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,267 psi | 71% | 2871 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,172 psi | 83% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,234 psi | 62% | 2726 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,812 psi | 60% | 2723 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,722 psi | 53% | 2625 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,994 psi | 46% | 2523 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,609 psi | 59% | 2762 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,258 psi | 82% | 2936 fps | 95.9% |
| Bofors RP15 | <<locked>> | 84% | 38,595 psi | 59% | 2713 fps | 95.7% |
| Bofors RP30 | <<locked>> | 90% | 39,392 psi | 61% | 2753 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 38,812 psi | 60% | 2723 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 50,546 psi | 78% | 2867 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 88% | 38,276 psi | 59% | 2703 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 50,067 psi | 77% | 2913 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,402 psi | 81% | 2930 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 44,179 psi | 68% | 2785 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,395 psi | 67% | 2772 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,482 psi | 67% | 2749 fps | 100% |
| Hodgdon Retumbo | 82.6 gr | 86% | 36,129 psi | 56% | 2736 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 50,386 psi | 78% | 2936 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 42% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,035 psi | 71% | 2795 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,040 psi | 80% | 2897 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,774 psi | 70% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,714 psi | 66% | 2730 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 86% | 42,728 psi | 66% | 2818 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,176 psi | 62% | 2782 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 49,501 psi | 76% | 2841 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,819 psi | 74% | 2831 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,661 psi | 47% | 2461 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 46,427 psi | 71% | 2838 fps | 97.8% |
| Norma 217 | <<locked>> | 94% | 34,853 psi | 54% | 2677 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 37,942 psi | 58% | 2730 fps | 97.1% |
| Norma URP | <<locked>> | 80% | 47,268 psi | 73% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,552 psi | 61% | 2759 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 46,282 psi | 71% | 2844 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 35,389 psi | 54% | 2628 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1798 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,602 psi | 75% | 2881 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,963 psi | 72% | 2900 fps | 100% |
| ReloadSwiss RS 76 | 86.3 gr | 84% | 32,967 psi | 51% | 2635 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 43,990 psi | 68% | 2867 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 41,423 psi | 64% | 2713 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 39,494 psi | 61% | 2707 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 80% | 50,546 psi | 78% | 2867 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,501 psi | 76% | 2841 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,819 psi | 74% | 2831 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,897 psi | 84% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,457 psi | 75% | 2789 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,175 psi | 60% | 2703 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 54,926 psi | 85% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,380 psi | 65% | 2697 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 44,411 psi | 68% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,016 psi | 62% | 2690 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 52,649 psi | 81% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,704 psi | 75% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,693 psi | 53% | 2556 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 48,153 psi | 74% | 2844 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,725 psi | 60% | 2700 fps | 99.6% |
| Vihtavuori N560 | <<locked>> | 84% | 44,135 psi | 68% | 2848 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 41,408 psi | 64% | 2769 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 45,150 psi | 69% | 2881 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,225 psi | 74% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,227 psi | 77% | 2917 fps | 99.6% |
| Winchester StaBALL HD | 78.9 gr | 80% | 31,111 psi | 48% | 2635 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,782 psi | 57% | 2612 fps | 95.2% |
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 | 160gr | Peregrine VRG-3 Lever. Hodgdon Retumbo delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,136 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 160.0 gr projectile in 0.308" calls for a 1:13.5 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 160gr | Peregrine VRG-3 Lever they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, IMR 7977 Enduron, Vihtavuori N170 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.