Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 155.8gr | Peregrine Glider (Glider GRM) bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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>> | 94% | 55,492 psi | 85% | 2972 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,318 psi | 87% | 3015 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,508 psi | 90% | 3127 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 57,174 psi | 88% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,827 psi | 89% | 3074 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 55,593 psi | 86% | 3071 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,966 psi | 77% | 2959 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,570 psi | 69% | 2910 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,595 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,464 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,795 psi | 84% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,116 psi | 88% | 3058 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,622 psi | 86% | 3068 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,826 psi | 87% | 3038 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,579 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,812 psi | 89% | 3130 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,566 psi | 89% | 3025 fps | 96.3% |
| Bofors RP15 | <<locked>> | 98% | 58,523 psi | 90% | 3107 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,373 psi | 81% | 3028 fps | 98.5% |
| Bofors RP5 | <<locked>> | 94% | 55,622 psi | 86% | 3068 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 58,639 psi | 90% | 3018 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,376 psi | 85% | 3051 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 86% | 58,233 psi | 90% | 3071 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,145 psi | 88% | 3031 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 55,463 psi | 85% | 3009 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,204 psi | 90% | 3051 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,798 psi | 89% | 2992 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,347 psi | 85% | 3166 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 55,390 psi | 85% | 3048 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 57% | 1962 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,971 psi | 88% | 3002 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,550 psi | 87% | 2992 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,797 psi | 87% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,420 psi | 87% | 2995 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 57,392 psi | 88% | 3107 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 57,188 psi | 88% | 2989 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,274 psi | 85% | 2979 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,334 psi | 90% | 3058 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 39,958 psi | 61% | 2828 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 55,506 psi | 85% | 3087 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 58,523 psi | 90% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,537 psi | 90% | 3127 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 57,798 psi | 89% | 3058 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,203 psi | 88% | 3058 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 58% | 2008 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,465 psi | 90% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,753 psi | 87% | 3035 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,361 psi | 85% | 3064 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 3163 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,532 psi | 79% | 3035 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 82% | 56,202 psi | 86% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,726 psi | 90% | 3038 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 56,637 psi | 87% | 3048 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 58,639 psi | 90% | 3018 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,188 psi | 88% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,274 psi | 85% | 2979 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 58,175 psi | 90% | 3028 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,043 psi | 86% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,608 psi | 87% | 2936 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,188 psi | 86% | 3041 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 55,709 psi | 86% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,898 psi | 88% | 2969 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 55,419 psi | 85% | 2999 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,000 psi | 88% | 3015 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,261 psi | 88% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,710 psi | 87% | 2992 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,884 psi | 88% | 2992 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,898 psi | 86% | 2995 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,085 psi | 85% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,317 psi | 85% | 3081 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 55,347 psi | 85% | 3054 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,417 psi | 81% | 3045 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,623 psi | 87% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,436 psi | 90% | 3071 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,085 psi | 85% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,334 psi | 88% | 3012 fps | 99.4% |
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% | 33,547 psi | 52% | 2562 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 45,368 psi | 70% | 2838 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 46,833 psi | 72% | 2927 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 53,635 psi | 83% | 2933 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,770 psi | 63% | 2769 fps | 96% |
| ADI AR 2213 | <<locked>> | 88% | 44,904 psi | 69% | 2881 fps | 96% |
| ADI AR 2217 | <<locked>> | 96% | 43,308 psi | 67% | 2831 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 33,852 psi | 52% | 2654 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,752 psi | 84% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,613 psi | 67% | 2851 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,981 psi | 78% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,942 psi | 58% | 2700 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,059 psi | 60% | 2756 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,314 psi | 50% | 2598 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,182 psi | 46% | 2552 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,810 psi | 55% | 2733 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,056 psi | 83% | 2966 fps | 95.5% |
| Bofors RP15 | <<locked>> | 86% | 38,711 psi | 60% | 2746 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 42,250 psi | 65% | 2841 fps | 96% |
| Bofors RP5 | <<locked>> | 84% | 39,059 psi | 60% | 2756 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,269 psi | 74% | 2851 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 41,365 psi | 64% | 2792 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,442 psi | 73% | 2894 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 49,850 psi | 77% | 2910 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 44,875 psi | 69% | 2825 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,166 psi | 73% | 2867 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,988 psi | 63% | 2733 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,303 psi | 56% | 2759 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,413 psi | 73% | 2913 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 42% | 1765 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,700 psi | 67% | 2776 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,821 psi | 77% | 2881 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 43,323 psi | 67% | 2789 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,337 psi | 67% | 2766 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 43,134 psi | 66% | 2851 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,036 psi | 72% | 2825 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 45,353 psi | 70% | 2812 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 30,748 psi | 47% | 2490 fps | 95% |
| Norma 204 | <<locked>> | 80% | 43,830 psi | 67% | 2812 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 34,664 psi | 53% | 2700 fps | 95.3% |
| Norma MRP | 77.1 gr | 80% | 35,491 psi | 55% | 2700 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 44,628 psi | 69% | 2831 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 43,134 psi | 66% | 2861 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 43,627 psi | 67% | 2818 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 35,650 psi | 55% | 2661 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,302 psi | 84% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,701 psi | 70% | 2861 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,121 psi | 68% | 2877 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,781 psi | 55% | 2740 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,485 psi | 73% | 2963 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 52,373 psi | 81% | 2913 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,047 psi | 65% | 2746 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 39,929 psi | 61% | 2743 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 48,269 psi | 74% | 2851 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,036 psi | 72% | 2825 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 45,353 psi | 70% | 2812 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,128 psi | 83% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,475 psi | 81% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,166 psi | 71% | 2769 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,581 psi | 61% | 2740 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 52,199 psi | 80% | 2910 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,238 psi | 71% | 2792 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 41,582 psi | 64% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,710 psi | 58% | 2664 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 80% | 50,053 psi | 77% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,093 psi | 71% | 2828 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 37,521 psi | 58% | 2648 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 45,513 psi | 70% | 2825 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 36,274 psi | 56% | 2677 fps | 99% |
| Vihtavuori N560 | 82.8 gr | 86% | 44,454 psi | 68% | 2881 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 44,628 psi | 69% | 2864 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 48,631 psi | 75% | 2976 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,716 psi | 70% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,442 psi | 73% | 2894 fps | 99% |
| Winchester StaBALL HD | 76.2 gr | 80% | 28,674 psi | 44% | 2595 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,972 psi | 62% | 2710 fps | 95.9% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 155.8gr | Peregrine Glider (Glider GRM). Hodgdon Retumbo delivers the highest muzzle velocity at 3,166 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,166 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 156.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 155.8gr | Peregrine Glider (Glider GRM) 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.