Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Norma Kalahari bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Ramshot Grand.
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% | 57,188 psi | 88% | 3035 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,899 psi | 89% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,970 psi | 86% | 3127 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 58,218 psi | 90% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,998 psi | 85% | 3071 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 56,985 psi | 88% | 3133 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,416 psi | 79% | 3022 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,021 psi | 71% | 2976 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,303 psi | 85% | 3068 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,566 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,028 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,407 psi | 90% | 3120 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,130 psi | 88% | 3130 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,291 psi | 90% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,189 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,143 psi | 85% | 3130 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 58,653 psi | 90% | 3081 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 56,086 psi | 86% | 3110 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,085 psi | 83% | 3094 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 57,130 psi | 88% | 3130 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,217 psi | 87% | 3028 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 3114 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 55,709 psi | 86% | 3074 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 58,160 psi | 90% | 3087 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 56,637 psi | 87% | 3068 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,651 psi | 86% | 3051 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,274 psi | 85% | 3002 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,927 psi | 88% | 3232 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,710 psi | 87% | 3107 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 57% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,117 psi | 89% | 3061 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,624 psi | 89% | 3051 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 58,262 psi | 90% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,406 psi | 88% | 3051 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 54,766 psi | 84% | 3107 fps | 98.2% |
| Lovex S065 | <<locked>> | 86% | 58,450 psi | 90% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,536 psi | 87% | 3038 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,593 psi | 86% | 3058 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 41,539 psi | 64% | 2894 fps | 97.7% |
| Norma MRP | <<locked>> | 92% | 57,130 psi | 88% | 3150 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,028 psi | 86% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,666 psi | 86% | 3123 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 55,230 psi | 85% | 3061 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 58,798 psi | 90% | 3117 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 58% | 2051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,160 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,536 psi | 87% | 3123 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3228 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,432 psi | 82% | 3104 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 57,566 psi | 89% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,130 psi | 86% | 3041 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 57,885 psi | 89% | 3107 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 56,217 psi | 87% | 3028 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,450 psi | 90% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,536 psi | 87% | 3038 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,956 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,783 psi | 89% | 2995 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,435 psi | 88% | 3100 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 56,942 psi | 88% | 3022 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,189 psi | 90% | 3025 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 56,913 psi | 88% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,653 psi | 90% | 3077 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 58,552 psi | 90% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,870 psi | 89% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,320 psi | 90% | 3054 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 57,261 psi | 88% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,623 psi | 87% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,797 psi | 87% | 3143 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 57,072 psi | 88% | 3117 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,114 psi | 83% | 3107 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,841 psi | 89% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,912 psi | 86% | 3077 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,985 psi | 88% | 3182 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,769 psi | 90% | 3071 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% | 35,056 psi | 54% | 2631 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 46,862 psi | 72% | 2904 fps | 99.9% |
| Accurate MAGPRO | 88.6 gr | 88% | 48,414 psi | 75% | 2992 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 54,520 psi | 84% | 2989 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,001 psi | 60% | 2766 fps | 95% |
| ADI AR 2213 | <<locked>> | 86% | 42,975 psi | 66% | 2874 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 44,657 psi | 69% | 2890 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 92% | 35,128 psi | 54% | 2720 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,407 psi | 61% | 2766 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,802 psi | 69% | 2917 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,069 psi | 80% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,044 psi | 60% | 2759 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,321 psi | 62% | 2818 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,605 psi | 52% | 2661 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,314 psi | 48% | 2615 fps | 95.6% |
| Alliant Reloder-26 | 81.4 gr | 80% | 37,188 psi | 57% | 2799 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,013 psi | 85% | 3022 fps | 95.5% |
| Bofors RP15 | <<locked>> | 86% | 39,943 psi | 61% | 2808 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 40,698 psi | 63% | 2841 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 40,321 psi | 62% | 2818 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 49,284 psi | 76% | 2910 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 42,772 psi | 66% | 2858 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 48,515 psi | 75% | 2953 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 51,010 psi | 79% | 2972 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 45,890 psi | 71% | 2881 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,092 psi | 69% | 2864 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,264 psi | 65% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,550 psi | 58% | 2825 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 48,718 psi | 75% | 2972 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,744 psi | 69% | 2835 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,647 psi | 78% | 2940 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 44,469 psi | 68% | 2848 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,411 psi | 68% | 2822 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 44,353 psi | 68% | 2913 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,298 psi | 74% | 2887 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 46,630 psi | 72% | 2871 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 32,140 psi | 49% | 2556 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 45,020 psi | 69% | 2871 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 36,129 psi | 56% | 2766 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,680 psi | 56% | 2759 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 45,861 psi | 71% | 2894 fps | 99.8% |
| Ramshot Grand | 84.3 gr | 86% | 41,263 psi | 64% | 2854 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 44,889 psi | 69% | 2884 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 36,912 psi | 57% | 2723 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 43% | 1847 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,108 psi | 73% | 2923 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,339 psi | 70% | 2940 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,505 psi | 53% | 2730 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,556 psi | 70% | 2959 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 53,809 psi | 83% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,076 psi | 66% | 2805 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,435 psi | 59% | 2743 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 49,284 psi | 76% | 2910 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,298 psi | 74% | 2887 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 46,630 psi | 72% | 2871 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,490 psi | 82% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,340 psi | 73% | 2831 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 40,741 psi | 63% | 2799 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 53,519 psi | 82% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 47,384 psi | 73% | 2851 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 42,917 psi | 66% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,102 psi | 60% | 2730 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 51,300 psi | 79% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,268 psi | 73% | 2884 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 38,740 psi | 60% | 2707 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,862 psi | 72% | 2890 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 37,782 psi | 58% | 2746 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 45,876 psi | 71% | 2946 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 90% | 43,047 psi | 66% | 2864 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 50,183 psi | 77% | 3041 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,775 psi | 72% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,704 psi | 75% | 2956 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,994 psi | 46% | 2664 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,348 psi | 59% | 2707 fps | 95% |
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 75 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Norma Kalahari. Hodgdon Retumbo delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,232 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 150.0 gr projectile in 0.308" calls for a 1:12.5 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. Accurate MAGPRO, Alliant Reloder-26, Ramshot Grand rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Norma Kalahari 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.