Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 135gr | Alaska Bullet Works Kodiak SP SPBC bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,840 psi | 86% | 3130 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 56,492 psi | 87% | 3182 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,726 psi | 90% | 3281 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,000 psi | 88% | 3153 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,638 psi | 89% | 3228 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 94% | 55,651 psi | 86% | 3225 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 3100 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,889 psi | 69% | 3051 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,378 psi | 90% | 3176 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,217 psi | 88% | 3241 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,665 psi | 84% | 3196 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,130 psi | 88% | 3215 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,724 psi | 86% | 3219 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,898 psi | 88% | 3202 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,507 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,957 psi | 89% | 3287 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 58,639 psi | 90% | 3264 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,663 psi | 81% | 3179 fps | 97.7% |
| Bofors RP5 | <<locked>> | 94% | 55,724 psi | 86% | 3219 fps | 98.8% |
| Bofors RP7 | <<locked>> | 86% | 58,595 psi | 90% | 3182 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,376 psi | 85% | 3199 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 86% | 58,276 psi | 90% | 3232 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 56,913 psi | 88% | 3189 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 92% | 55,463 psi | 85% | 3159 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,262 psi | 90% | 3205 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,551 psi | 89% | 3153 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3317 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 84% | 55,216 psi | 85% | 3199 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 2113 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,855 psi | 88% | 3159 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,376 psi | 87% | 3150 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 56,869 psi | 88% | 3169 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,304 psi | 87% | 3146 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 96% | 57,217 psi | 88% | 3258 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 57,087 psi | 88% | 3150 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 55,448 psi | 85% | 3140 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,884 psi | 88% | 3146 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 58,262 psi | 90% | 3215 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 40,364 psi | 62% | 2963 fps | 96.4% |
| Norma MRP | <<locked>> | 92% | 55,579 psi | 86% | 3238 fps | 99.5% |
| Norma URP | <<locked>> | 88% | 58,523 psi | 90% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,392 psi | 90% | 3278 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 57,740 psi | 89% | 3215 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 57,406 psi | 88% | 3209 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 58% | 2162 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,204 psi | 90% | 3245 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,695 psi | 87% | 3196 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,143 psi | 85% | 3222 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,188 psi | 88% | 3317 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,909 psi | 80% | 3179 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 56,275 psi | 87% | 3136 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,668 psi | 90% | 3192 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 56,550 psi | 87% | 3202 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 58,595 psi | 90% | 3182 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,087 psi | 88% | 3150 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 55,448 psi | 85% | 3140 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,986 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,753 psi | 86% | 3009 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,652 psi | 87% | 3097 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,115 psi | 86% | 3196 fps | 98.8% |
| Somchem S355 | <<locked>> | 82% | 55,854 psi | 86% | 3133 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,971 psi | 88% | 3117 fps | 97.3% |
| Somchem S365 | <<locked>> | 88% | 55,405 psi | 85% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,276 psi | 88% | 3173 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 57,246 psi | 88% | 3097 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,608 psi | 87% | 3153 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,913 psi | 88% | 3143 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 86% | 55,941 psi | 86% | 3153 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,114 psi | 85% | 3176 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,303 psi | 85% | 3228 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 98% | 55,637 psi | 86% | 3202 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,579 psi | 87% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,465 psi | 90% | 3235 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,100 psi | 85% | 3274 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,551 psi | 89% | 3166 fps | 98.9% |
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% | 34,069 psi | 52% | 2703 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 45,701 psi | 70% | 2999 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 50,647 psi | 78% | 3140 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 53,330 psi | 82% | 3097 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,729 psi | 67% | 2976 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 90% | 48,283 psi | 74% | 3087 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 46,775 psi | 72% | 3035 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 36,622 psi | 56% | 2848 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,781 psi | 84% | 3120 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,468 psi | 67% | 3005 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,705 psi | 78% | 3136 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 43,642 psi | 67% | 2966 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,018 psi | 65% | 2959 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,503 psi | 50% | 2736 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,648 psi | 50% | 2749 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,013 psi | 55% | 2871 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 41,611 psi | 64% | 2946 fps | 95.1% |
| Bofors RP30 | <<locked>> | 96% | 45,556 psi | 70% | 3045 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 42,018 psi | 65% | 2959 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 48,240 psi | 74% | 3005 fps | 98% |
| Hodgdon H1000 | <<locked>> | 94% | 44,759 psi | 69% | 2999 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,311 psi | 73% | 3041 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,748 psi | 77% | 3064 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 88% | 48,196 psi | 74% | 3031 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 50,647 psi | 78% | 3077 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,031 psi | 63% | 2884 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,887 psi | 64% | 3035 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,311 psi | 73% | 3058 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 42% | 1903 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,685 psi | 67% | 2923 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,588 psi | 76% | 3035 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 43,294 psi | 67% | 2936 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 49,516 psi | 76% | 3028 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 46,325 psi | 71% | 3061 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,108 psi | 73% | 2979 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 45,527 psi | 70% | 2963 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 35,708 psi | 55% | 2743 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 43,859 psi | 68% | 2956 fps | 95.7% |
| Norma 217 | <<locked>> | 98% | 37,521 psi | 58% | 2894 fps | 95.2% |
| Norma MRP | 84.4 gr | 82% | 38,435 psi | 59% | 2904 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 44,686 psi | 69% | 2986 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 46,470 psi | 72% | 3064 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 43,671 psi | 67% | 2969 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 88% | 38,812 psi | 60% | 2864 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 43% | 1949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,882 psi | 83% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,730 psi | 70% | 3009 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,048 psi | 68% | 3025 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,230 psi | 56% | 2867 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,993 psi | 74% | 3107 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 52,547 psi | 81% | 3081 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 48,167 psi | 74% | 3012 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 84% | 42,960 psi | 66% | 2949 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 48,240 psi | 74% | 3005 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,108 psi | 73% | 2979 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 45,527 psi | 70% | 2963 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,070 psi | 83% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,446 psi | 81% | 2966 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,253 psi | 71% | 2920 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,598 psi | 66% | 2946 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 52,228 psi | 80% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,661 psi | 76% | 2995 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 41,597 psi | 64% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 40,712 psi | 63% | 2867 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 50,169 psi | 77% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,209 psi | 71% | 2982 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 40,495 psi | 62% | 2848 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 45,745 psi | 70% | 2982 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 36,477 psi | 56% | 2818 fps | 98.2% |
| Vihtavuori N560 | 90.5 gr | 88% | 47,892 psi | 74% | 3094 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 48,341 psi | 74% | 3074 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,716 psi | 70% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,456 psi | 73% | 3048 fps | 98.3% |
| Winchester StaBALL HD | 81.4 gr | 80% | 29,022 psi | 45% | 2720 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,149 psi | 66% | 2910 fps | 95.8% |
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 81 powders for .300 Rem. Ultra Mag. loaded with the .308 | 135gr | Alaska Bullet Works Kodiak SP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 2,113 fps to 3,317 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 135.0 gr projectile in 0.308" calls for a 1:16.0 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. Winchester StaBALL HD, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 135gr | Alaska Bullet Works Kodiak SP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 8133 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.