Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 220gr | Nosler Partition bullet and 52 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 ReloadSwiss RS 80.
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>> | 88% | 56,768 psi | 89% | 2690 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,521 psi | 87% | 2792 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 54,346 psi | 85% | 2720 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,405 psi | 88% | 2792 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 54,911 psi | 86% | 2772 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2881 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,421 psi | 90% | 2759 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,840 psi | 89% | 2785 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 54,926 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,056 psi | 86% | 2766 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,419 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,492 psi | 89% | 2864 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,895 psi | 81% | 2785 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,695 psi | 89% | 2756 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 56,043 psi | 88% | 2772 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 54,810 psi | 86% | 2782 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 56,840 psi | 89% | 2785 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,289 psi | 88% | 2789 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,419 psi | 87% | 2726 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,462 psi | 85% | 2710 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,766 psi | 86% | 2631 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,114 psi | 85% | 2848 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 1713 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,666 psi | 89% | 2694 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,392 psi | 90% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,883 psi | 88% | 2703 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 54,723 psi | 86% | 2772 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,591 psi | 82% | 2769 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 54,926 psi | 86% | 2667 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 2792 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,956 psi | 89% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,927 psi | 88% | 2795 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,157 psi | 85% | 2730 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 1755 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,578 psi | 86% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,795 psi | 84% | 2805 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 54,882 psi | 86% | 2690 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 57,232 psi | 90% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,840 psi | 89% | 2749 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,043 psi | 88% | 2684 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 56,840 psi | 89% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,595 psi | 90% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,421 psi | 90% | 2713 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,318 psi | 88% | 2740 fps | 97% |
| Vihtavuori N555 | <<locked>> | 86% | 56,913 psi | 89% | 2720 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,376 psi | 88% | 2802 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 57,014 psi | 89% | 2795 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 54,563 psi | 86% | 2805 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 96% | 55,840 psi | 88% | 2867 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 54,679 psi | 86% | 2779 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,348 psi | 90% | 2723 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% | 43,497 psi | 68% | 2487 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,136 psi | 71% | 2615 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 47,514 psi | 74% | 2608 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,743 psi | 67% | 2556 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 34,214 psi | 54% | 2375 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 94% | 44,135 psi | 69% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 29,254 psi | 46% | 2287 fps | 96.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,398 psi | 74% | 2602 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,482 psi | 68% | 2562 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,279 psi | 66% | 2500 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,579 psi | 57% | 2448 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,732 psi | 75% | 2664 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,208 psi | 71% | 2667 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 44,730 psi | 70% | 2654 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,077 psi | 69% | 2536 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 40,509 psi | 63% | 2500 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 34,142 psi | 54% | 2385 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 43,482 psi | 68% | 2562 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 34,751 psi | 54% | 2388 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 80% | 45,353 psi | 71% | 2556 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,512 psi | 70% | 2539 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,343 psi | 80% | 2582 fps | 100% |
| Hodgdon Retumbo | 73.8 gr | 80% | 35,737 psi | 56% | 2490 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1529 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,098 psi | 83% | 2641 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,911 psi | 84% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,282 psi | 73% | 2546 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 41,640 psi | 65% | 2543 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 32,822 psi | 51% | 2375 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,579 psi | 59% | 2372 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 28,848 psi | 45% | 2287 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 46,166 psi | 72% | 2628 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,640 psi | 65% | 2556 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 37,405 psi | 59% | 2438 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1565 fps | 100% |
| ReloadSwiss RS 76 | 79 gr | 80% | 34,896 psi | 55% | 2467 fps | 99% |
| ReloadSwiss RS 80 | 83.6 gr | 84% | 36,927 psi | 58% | 2484 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 48,356 psi | 76% | 2585 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,166 psi | 74% | 2595 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,833 psi | 73% | 2592 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,182 psi | 77% | 2575 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 53,069 psi | 83% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,442 psi | 74% | 2569 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,481 psi | 65% | 2457 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 49,342 psi | 77% | 2625 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 46,992 psi | 74% | 2575 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,847 psi | 72% | 2628 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 80% | 38,116 psi | 60% | 2454 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 38,377 psi | 60% | 2503 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 90% | 45,049 psi | 71% | 2674 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,509 psi | 63% | 2562 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,714 psi | 69% | 2507 fps | 99.2% |
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 59 powders for .300 Norma Mag. loaded with the .308 | 220gr | Nosler Partition. ADI AR 2218 delivers the highest muzzle velocity at 2,881 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,881 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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, ReloadSwiss RS 80 rank at the top here: for .300 Norma Mag. with the .308 | 220gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.