Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 199gr | TWENTY-NINE ERTP bullet and 72 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 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 56,492 psi | 87% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,072 psi | 88% | 2726 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 58,262 psi | 90% | 2854 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 55,274 psi | 85% | 2799 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,870 psi | 89% | 2785 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,985 psi | 86% | 2799 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,349 psi | 90% | 2822 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,879 psi | 78% | 2799 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,707 psi | 81% | 2789 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,030 psi | 89% | 2782 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,059 psi | 89% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,363 psi | 88% | 2776 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,376 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,160 psi | 90% | 2756 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,146 psi | 89% | 2822 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,752 psi | 84% | 2789 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 2851 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,840 psi | 87% | 2756 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 55,796 psi | 86% | 2785 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,885 psi | 89% | 2835 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,376 psi | 87% | 2792 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,117 psi | 89% | 2720 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,043 psi | 86% | 2792 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,262 psi | 90% | 2772 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,521 psi | 85% | 2736 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,117 psi | 89% | 2772 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,160 psi | 90% | 2697 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,014 psi | 88% | 2904 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 58% | 1749 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,681 psi | 87% | 2713 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,159 psi | 88% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,057 psi | 86% | 2717 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 58,247 psi | 90% | 2838 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,356 psi | 74% | 2710 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 56,927 psi | 88% | 2690 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,390 psi | 85% | 2690 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,001 psi | 89% | 2720 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,957 psi | 89% | 2769 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,950 psi | 75% | 2730 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,565 psi | 87% | 2812 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,230 psi | 85% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,230 psi | 85% | 2799 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 57,812 psi | 89% | 2762 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,102 psi | 89% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,435 psi | 59% | 1791 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,159 psi | 88% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,767 psi | 86% | 2772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,247 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,522 psi | 89% | 2861 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 88% | 58,494 psi | 90% | 2756 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 57,029 psi | 88% | 2766 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,117 psi | 89% | 2720 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,927 psi | 88% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,390 psi | 85% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,883 psi | 86% | 2648 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,623 psi | 87% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,449 psi | 87% | 2697 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 56,362 psi | 87% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,595 psi | 89% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,797 psi | 87% | 2697 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,276 psi | 88% | 2720 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,391 psi | 87% | 2736 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 82% | 55,927 psi | 86% | 2700 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,347 psi | 87% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,057 psi | 86% | 2812 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 56,594 psi | 87% | 2799 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,986 psi | 89% | 2861 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 55,158 psi | 85% | 2861 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,144 psi | 86% | 2648 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,479 psi | 90% | 2776 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,754 psi | 89% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,508 psi | 89% | 2736 fps | 100% |
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% | 40,263 psi | 62% | 2454 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 53,229 psi | 82% | 2674 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,048 psi | 68% | 2625 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 41,495 psi | 64% | 2562 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,193 psi | 68% | 2572 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,668 psi | 61% | 2516 fps | 96.8% |
| ADI AR 2217 | <<locked>> | 86% | 36,071 psi | 56% | 2434 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 47,253 psi | 73% | 2730 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 28,747 psi | 44% | 2290 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,628 psi | 69% | 2572 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,894 psi | 78% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,208 psi | 68% | 2566 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,263 psi | 62% | 2523 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,972 psi | 60% | 2474 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,591 psi | 52% | 2408 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,772 psi | 67% | 2625 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,657 psi | 69% | 2664 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,193 psi | 68% | 2543 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,362 psi | 57% | 2461 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 33,402 psi | 51% | 2398 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 40,263 psi | 62% | 2523 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 54,621 psi | 84% | 2674 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,374 psi | 53% | 2395 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 54,534 psi | 84% | 2723 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,163 psi | 65% | 2516 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,510 psi | 64% | 2503 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,877 psi | 74% | 2562 fps | 100% |
| Hodgdon Retumbo | 70.7 gr | 80% | 32,851 psi | 51% | 2438 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 43% | 1568 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,922 psi | 77% | 2615 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 50,183 psi | 77% | 2618 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,468 psi | 67% | 2510 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 38,305 psi | 59% | 2497 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,287 psi | 53% | 2434 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 53,563 psi | 82% | 2644 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,895 psi | 80% | 2641 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,693 psi | 53% | 2343 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 50,618 psi | 78% | 2661 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,979 psi | 46% | 2346 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 42,612 psi | 66% | 2589 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 51,619 psi | 79% | 2657 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,029 psi | 59% | 2500 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 50,647 psi | 78% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,185 psi | 53% | 2388 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 44% | 1604 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,476 psi | 82% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,793 psi | 80% | 2717 fps | 100% |
| ReloadSwiss RS 76 | 75.6 gr | 80% | 31,937 psi | 49% | 2408 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,189 psi | 60% | 2552 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 45,237 psi | 70% | 2549 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,787 psi | 67% | 2559 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 54,621 psi | 84% | 2674 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,563 psi | 82% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,895 psi | 80% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,330 psi | 81% | 2598 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,453 psi | 67% | 2552 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 46,209 psi | 71% | 2536 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 49,211 psi | 76% | 2615 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,295 psi | 68% | 2536 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 53,098 psi | 82% | 2648 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,537 psi | 59% | 2421 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 52,736 psi | 81% | 2680 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 52,402 psi | 81% | 2654 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,337 psi | 67% | 2543 fps | 100% |
| Vihtavuori N560 | 73.4 gr | 80% | 42,453 psi | 65% | 2582 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 37,550 psi | 58% | 2467 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 40,451 psi | 62% | 2566 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 94% | 47,616 psi | 73% | 2736 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,402 psi | 81% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,708 psi | 84% | 2726 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,303 psi | 56% | 2520 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,625 psi | 63% | 2470 fps | 98.2% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 199gr | TWENTY-NINE ERTP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,904 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 199.0 gr projectile in 0.308" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 199gr | TWENTY-NINE ERTP 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.