Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 137gr | Hammer Hunter bullet and 77 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>> | 96% | 58,291 psi | 90% | 3153 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,129 psi | 85% | 3146 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,840 psi | 86% | 3241 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 94% | 57,174 psi | 88% | 3241 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,999 psi | 86% | 3120 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,304 psi | 87% | 3192 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 58,204 psi | 90% | 3251 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,820 psi | 75% | 3061 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,671 psi | 67% | 3012 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,594 psi | 87% | 3189 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,348 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,057 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,537 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,883 psi | 86% | 3179 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,131 psi | 89% | 3245 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,317 psi | 85% | 3166 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,172 psi | 85% | 3219 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,159 psi | 86% | 3251 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,072 psi | 88% | 3225 fps | 98.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,155 psi | 79% | 3136 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 58,131 psi | 89% | 3245 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 57,551 psi | 89% | 3150 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,041 psi | 83% | 3163 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 58,755 psi | 90% | 3179 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 57,058 psi | 88% | 3199 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 55,840 psi | 86% | 3153 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 94% | 58,146 psi | 89% | 3186 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,913 psi | 88% | 3169 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,478 psi | 87% | 3127 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,925 psi | 83% | 3278 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 58,189 psi | 90% | 3232 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 56% | 2090 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,782 psi | 86% | 3127 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,564 psi | 86% | 3120 fps | 99.4% |
| IMR 4831 | <<locked>> | 88% | 55,637 psi | 86% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,187 psi | 85% | 3110 fps | 97% |
| IMR 7828 SSC | <<locked>> | 96% | 55,811 psi | 86% | 3219 fps | 97.8% |
| Lovex S065 | <<locked>> | 86% | 56,231 psi | 87% | 3117 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 57,870 psi | 89% | 3163 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 3114 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 56,971 psi | 88% | 3179 fps | 98.6% |
| Norma MRP | <<locked>> | 94% | 58,189 psi | 90% | 3268 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 57,261 psi | 88% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,971 psi | 88% | 3241 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 88% | 56,449 psi | 87% | 3182 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 55,680 psi | 86% | 3169 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 58% | 2139 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 58,523 psi | 90% | 3159 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,884 psi | 88% | 3215 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,492 psi | 85% | 3163 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,030 psi | 89% | 3251 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,448 psi | 85% | 3274 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 55,245 psi | 85% | 3104 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,595 psi | 89% | 3159 fps | 98% |
| Rottweil R 905 | <<locked>> | 92% | 55,259 psi | 85% | 3163 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 86% | 57,551 psi | 89% | 3150 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,231 psi | 87% | 3117 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 88% | 57,870 psi | 89% | 3163 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,869 psi | 88% | 3159 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,465 psi | 90% | 3028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,535 psi | 85% | 3061 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 58,682 psi | 90% | 3222 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 58,508 psi | 90% | 3153 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,782 psi | 86% | 3084 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 57,914 psi | 89% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,072 psi | 86% | 3140 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 56,318 psi | 87% | 3068 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,376 psi | 85% | 3120 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,579 psi | 86% | 3110 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 58,639 psi | 90% | 3179 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,653 psi | 89% | 3199 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,928 psi | 89% | 3258 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,218 psi | 90% | 3228 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,376 psi | 85% | 3071 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,246 psi | 88% | 3199 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,580 psi | 89% | 3301 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,202 psi | 86% | 3130 fps | 98.7% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 35,650 psi | 55% | 2733 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 44,657 psi | 69% | 2966 fps | 99.4% |
| Accurate High Country | <<locked>> | 86% | 44,918 psi | 69% | 3035 fps | 95% |
| Accurate MAGPRO | <<locked>> | 90% | 49,313 psi | 76% | 3100 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 52,475 psi | 81% | 3064 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 42,786 psi | 66% | 2940 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 47,152 psi | 73% | 3051 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 98% | 45,527 psi | 70% | 2995 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 38,087 psi | 59% | 2877 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 43,120 psi | 66% | 2940 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,722 psi | 83% | 3091 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,612 psi | 66% | 2972 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,516 psi | 76% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,685 psi | 66% | 2930 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,944 psi | 63% | 2923 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,763 psi | 49% | 2703 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 34,084 psi | 52% | 2779 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,940 psi | 54% | 2835 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 43,453 psi | 67% | 2976 fps | 95.8% |
| Bofors RP30 | <<locked>> | 96% | 44,208 psi | 68% | 3005 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 40,944 psi | 63% | 2923 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 47,485 psi | 73% | 2976 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 94% | 43,598 psi | 67% | 2959 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 55,013 psi | 85% | 3123 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,398 psi | 71% | 3012 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 48,834 psi | 75% | 3031 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 50,517 psi | 78% | 3058 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,443 psi | 76% | 3038 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,190 psi | 62% | 2851 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 92% | 40,843 psi | 63% | 2995 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 46,195 psi | 71% | 3025 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 42% | 1883 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,989 psi | 66% | 2894 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,834 psi | 75% | 3002 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 42,496 psi | 65% | 2907 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 48,501 psi | 75% | 2992 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 45,310 psi | 70% | 3022 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 46,340 psi | 71% | 2949 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 44,773 psi | 69% | 2933 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 34,882 psi | 54% | 2713 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 43,033 psi | 66% | 2923 fps | 95.3% |
| Norma MRP | <<locked>> | 82% | 37,347 psi | 57% | 2867 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 43,859 psi | 68% | 2953 fps | 99.3% |
| Ramshot Grand | <<locked>> | 90% | 45,324 psi | 70% | 3031 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 42,815 psi | 66% | 2936 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 40,741 psi | 63% | 2897 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,050 psi | 43% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,723 psi | 84% | 3104 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,591 psi | 81% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,802 psi | 69% | 2979 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,062 psi | 66% | 2992 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 37,971 psi | 58% | 2907 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 51,692 psi | 80% | 3051 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 47,224 psi | 73% | 2979 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 41,930 psi | 65% | 2917 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,485 psi | 73% | 2976 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,340 psi | 71% | 2949 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 44,773 psi | 69% | 2933 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,127 psi | 82% | 3104 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,590 psi | 79% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,556 psi | 70% | 2890 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,611 psi | 64% | 2910 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 51,358 psi | 79% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 48,602 psi | 75% | 2959 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 40,741 psi | 63% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 39,885 psi | 61% | 2835 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 49,327 psi | 76% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,237 psi | 70% | 2949 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 39,450 psi | 61% | 2812 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 44,831 psi | 69% | 2949 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 35,665 psi | 55% | 2789 fps | 98% |
| Vihtavuori N560 | <<locked>> | 90% | 50,169 psi | 77% | 3123 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 94% | 47,050 psi | 72% | 3035 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,614 psi | 69% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,557 psi | 72% | 3015 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,369 psi | 44% | 2687 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 42,119 psi | 65% | 2877 fps | 95.4% |
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 | 137gr | Hammer Hunter. Winchester StaBALL HD delivers the highest muzzle velocity at 3,301 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,301 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 56–90 %, leaving at least 10 % headroom. The 137.0 gr projectile in 0.308" calls for a 1:13.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.