Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 171gr | Peregrine Backup (VRG-2) bullet and 74 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 IMR 7828 SSC.
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% | 57,696 psi | 89% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,073 psi | 89% | 2930 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 55,709 psi | 86% | 2995 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 90% | 56,884 psi | 88% | 3002 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 55,666 psi | 86% | 2940 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 57,754 psi | 89% | 3005 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 2966 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,444 psi | 78% | 2923 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,956 psi | 86% | 2940 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,709 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,317 psi | 85% | 2930 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,899 psi | 89% | 2995 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,651 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,666 psi | 86% | 2972 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,202 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,664 psi | 83% | 2979 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,129 psi | 85% | 2904 fps | 97% |
| Bofors RP15 | <<locked>> | 94% | 57,043 psi | 88% | 2982 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 55,390 psi | 85% | 2976 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 57,899 psi | 89% | 2995 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,028 psi | 86% | 2884 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 57,783 psi | 89% | 2992 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,072 psi | 86% | 2933 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,363 psi | 90% | 2946 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,043 psi | 88% | 2940 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,043 psi | 86% | 2923 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,854 psi | 86% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,566 psi | 90% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,014 psi | 88% | 2966 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,262 psi | 90% | 2920 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,493 psi | 88% | 2904 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,537 psi | 90% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,740 psi | 89% | 2923 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 55,709 psi | 86% | 2979 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,745 psi | 70% | 2828 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 58,305 psi | 90% | 2900 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,710 psi | 87% | 2900 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,230 psi | 85% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,695 psi | 86% | 2920 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 46,224 psi | 71% | 2854 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 58,117 psi | 89% | 3015 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,507 psi | 87% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,913 psi | 88% | 3002 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 55,448 psi | 85% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,419 psi | 85% | 2930 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 58% | 1942 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,697 psi | 90% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,450 psi | 88% | 2982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,521 psi | 85% | 3038 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,955 psi | 85% | 2992 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 56,521 psi | 87% | 2910 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 58,595 psi | 90% | 2976 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 56,028 psi | 86% | 2884 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,305 psi | 90% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,710 psi | 87% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,435 psi | 88% | 2854 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,175 psi | 90% | 2969 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 58,189 psi | 90% | 2897 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 57,595 psi | 89% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,216 psi | 85% | 2887 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 58,407 psi | 90% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,102 psi | 89% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,143 psi | 85% | 2871 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 57,450 psi | 88% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,421 psi | 88% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,667 psi | 89% | 3015 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 58,146 psi | 89% | 2995 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 55,419 psi | 85% | 2995 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,565 psi | 87% | 3051 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,015 psi | 89% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,275 psi | 87% | 2936 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,679 psi | 84% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,187 psi | 85% | 2884 fps | 99.7% |
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% | 37,724 psi | 58% | 2566 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 50,459 psi | 78% | 2822 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,481 psi | 64% | 2740 fps | 96.3% |
| Accurate MAGPRO | <<locked>> | 82% | 42,337 psi | 65% | 2743 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 42,105 psi | 65% | 2703 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 40,408 psi | 62% | 2694 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 39,276 psi | 60% | 2661 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 30,951 psi | 48% | 2490 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,482 psi | 65% | 2703 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,428 psi | 75% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,090 psi | 65% | 2697 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,029 psi | 59% | 2638 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,637 psi | 56% | 2595 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,546 psi | 49% | 2507 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,017 psi | 63% | 2743 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,487 psi | 76% | 2910 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,472 psi | 75% | 2785 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 35,215 psi | 54% | 2572 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 38,827 psi | 60% | 2671 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 38,029 psi | 59% | 2638 fps | 96.4% |
| Bofors RP7 | <<locked>> | 80% | 52,460 psi | 81% | 2828 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,318 psi | 57% | 2618 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 52,272 psi | 80% | 2877 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,650 psi | 84% | 2894 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 40,205 psi | 62% | 2641 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,337 psi | 65% | 2684 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,469 psi | 70% | 2707 fps | 100% |
| Hodgdon Retumbo | 80.5 gr | 84% | 35,491 psi | 55% | 2657 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,852 psi | 81% | 2904 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 43% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,877 psi | 74% | 2759 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,911 psi | 83% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,805 psi | 74% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,582 psi | 64% | 2641 fps | 95.7% |
| IMR 7828 SSC | 78.5 gr | 82% | 38,957 psi | 60% | 2671 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,869 psi | 57% | 2641 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 51,358 psi | 79% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,719 psi | 77% | 2792 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,285 psi | 50% | 2441 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 48,457 psi | 75% | 2802 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 32,169 psi | 50% | 2546 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 40,089 psi | 62% | 2707 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 49,371 psi | 76% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,783 psi | 60% | 2674 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 48,399 psi | 74% | 2805 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 34,650 psi | 53% | 2549 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 44% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,908 psi | 78% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,385 psi | 76% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 84.1 gr | 82% | 32,343 psi | 50% | 2562 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,178 psi | 66% | 2782 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 43,323 psi | 67% | 2684 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 41,394 psi | 64% | 2680 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 52,460 psi | 81% | 2828 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,358 psi | 79% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,719 psi | 77% | 2792 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,328 psi | 77% | 2746 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,060 psi | 63% | 2677 fps | 97.4% |
| Somchem S361 | <<locked>> | 80% | 44,179 psi | 68% | 2667 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 46,659 psi | 72% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,032 psi | 65% | 2664 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 80% | 54,679 psi | 84% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,807 psi | 78% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,376 psi | 56% | 2533 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 50,227 psi | 77% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,785 psi | 63% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,045 psi | 62% | 2697 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 86% | 40,770 psi | 63% | 2690 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 44,440 psi | 68% | 2802 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 52,402 psi | 81% | 2982 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,328 psi | 77% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,446 psi | 81% | 2877 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,518 psi | 52% | 2621 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,580 psi | 59% | 2589 fps | 96.6% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 171gr | Peregrine Backup (VRG-2). Hodgdon Retumbo delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,107 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 171.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 171gr | Peregrine Backup (VRG-2) 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.