Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 170gr | Norma Tipstrike bullet and 73 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 Accurate MAGPRO.
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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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>> | 92% | 57,551 psi | 89% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,073 psi | 89% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,333 psi | 87% | 2995 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 55,259 psi | 85% | 2936 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 57,159 psi | 88% | 2995 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 2959 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,111 psi | 77% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,579 psi | 86% | 2933 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,317 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,552 psi | 90% | 2979 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,464 psi | 88% | 2992 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,172 psi | 85% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,955 psi | 85% | 2969 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,854 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,997 psi | 82% | 2972 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,320 psi | 90% | 2949 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 56,637 psi | 87% | 2979 fps | 99.7% |
| Bofors RP30 | <<locked>> | 98% | 54,940 psi | 85% | 2972 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 57,464 psi | 88% | 2992 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 55,796 psi | 86% | 2877 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 57,203 psi | 88% | 2986 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,825 psi | 86% | 2933 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,044 psi | 89% | 2943 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 56,768 psi | 87% | 2933 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,564 psi | 86% | 2917 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,593 psi | 86% | 2858 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,841 psi | 89% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,652 psi | 87% | 2963 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,030 psi | 89% | 2920 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,159 psi | 88% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,407 psi | 90% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,421 psi | 88% | 2917 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 55,347 psi | 85% | 2979 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,426 psi | 70% | 2828 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 58,160 psi | 90% | 2897 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,623 psi | 87% | 2897 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,303 psi | 85% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,535 psi | 85% | 2917 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 45,905 psi | 71% | 2851 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 57,682 psi | 89% | 3012 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,304 psi | 87% | 2913 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,304 psi | 87% | 2995 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 55,332 psi | 85% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,911 psi | 85% | 2927 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 59% | 1942 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,436 psi | 90% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,782 psi | 87% | 2979 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,839 psi | 84% | 3031 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,462 psi | 84% | 2989 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 56,159 psi | 86% | 2907 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 58,262 psi | 90% | 2969 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,796 psi | 86% | 2877 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,160 psi | 90% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,623 psi | 87% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,392 psi | 88% | 2851 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,841 psi | 89% | 2966 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,856 psi | 89% | 2890 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 57,406 psi | 88% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,668 psi | 90% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,175 psi | 90% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,899 psi | 89% | 2904 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,624 psi | 90% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 57,159 psi | 88% | 2907 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,276 psi | 88% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,203 psi | 88% | 3009 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 57,783 psi | 89% | 2992 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 55,027 psi | 85% | 2992 fps | 98.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,898 psi | 86% | 3045 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,696 psi | 89% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,825 psi | 86% | 2933 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,320 psi | 90% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,810 psi | 84% | 2877 fps | 99.6% |
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% | 38,130 psi | 59% | 2575 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 50,647 psi | 78% | 2825 fps | 100% |
| Accurate MAGPRO | 81.4 gr | 82% | 42,235 psi | 65% | 2743 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 42,090 psi | 65% | 2703 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 40,321 psi | 62% | 2690 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 39,247 psi | 60% | 2657 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 31,125 psi | 48% | 2497 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,496 psi | 65% | 2703 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,211 psi | 74% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,105 psi | 65% | 2697 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,029 psi | 59% | 2641 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,709 psi | 56% | 2602 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,778 psi | 49% | 2516 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,075 psi | 63% | 2746 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,095 psi | 76% | 2904 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,445 psi | 79% | 2838 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 35,375 psi | 54% | 2575 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 38,783 psi | 60% | 2674 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 38,029 psi | 59% | 2641 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 52,402 psi | 81% | 2825 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 37,434 psi | 58% | 2621 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 52,054 psi | 80% | 2871 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,331 psi | 84% | 2887 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 43,033 psi | 66% | 2697 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,250 psi | 65% | 2680 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,585 psi | 70% | 2710 fps | 100% |
| Hodgdon Retumbo | 78.9 gr | 84% | 35,607 psi | 55% | 2661 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 52,518 psi | 81% | 2900 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 43% | 1703 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,834 psi | 74% | 2759 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,751 psi | 83% | 2848 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,877 psi | 74% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,611 psi | 64% | 2641 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 38,914 psi | 60% | 2671 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,581 psi | 61% | 2707 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 51,401 psi | 79% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,821 psi | 77% | 2792 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,692 psi | 50% | 2451 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 48,254 psi | 74% | 2799 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 32,227 psi | 50% | 2549 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,074 psi | 62% | 2707 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 49,298 psi | 76% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,667 psi | 60% | 2674 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 48,225 psi | 74% | 2805 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 34,693 psi | 53% | 2552 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,645 psi | 44% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,850 psi | 78% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,139 psi | 76% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 82.4 gr | 82% | 32,474 psi | 50% | 2566 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,960 psi | 66% | 2782 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 43,149 psi | 66% | 2680 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 41,481 psi | 64% | 2684 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 52,402 psi | 81% | 2825 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,401 psi | 79% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,821 psi | 77% | 2792 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,372 psi | 78% | 2749 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,147 psi | 63% | 2680 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 44,237 psi | 68% | 2667 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 46,688 psi | 72% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,076 psi | 65% | 2664 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 54,636 psi | 84% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,734 psi | 78% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,535 psi | 56% | 2539 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,111 psi | 77% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,002 psi | 63% | 2677 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 43,076 psi | 66% | 2762 fps | 96% |
| Vihtavuori N565 | <<locked>> | 86% | 40,828 psi | 63% | 2694 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 44,106 psi | 68% | 2799 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 52,011 psi | 80% | 2979 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,212 psi | 77% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,243 psi | 80% | 2874 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,446 psi | 51% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,609 psi | 59% | 2589 fps | 96.4% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 170gr | Norma Tipstrike. Hodgdon Retumbo delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,104 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 170.0 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-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, Accurate MAGPRO rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 170gr | Norma Tipstrike 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.