Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 230gr | Sierra MatchKing bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Alliant Reloder-33 and Hodgdon Retumbo.
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>> | 86% | 55,042 psi | 86% | 2618 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 45,324 psi | 71% | 2582 fps | 96% |
| Accurate MAGPRO | <<locked>> | 86% | 54,578 psi | 86% | 2730 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 56,072 psi | 88% | 2694 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,491 psi | 85% | 2713 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 57,087 psi | 89% | 2753 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 2877 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 98% | 55,999 psi | 88% | 2772 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,637 psi | 87% | 2687 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,042 psi | 86% | 2710 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,869 psi | 89% | 2667 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,232 psi | 90% | 2743 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,667 psi | 90% | 2753 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,882 psi | 86% | 2792 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2782 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,911 psi | 86% | 2680 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 54,476 psi | 85% | 2700 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,985 psi | 89% | 2766 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,042 psi | 86% | 2710 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,694 psi | 86% | 2717 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,203 psi | 90% | 2703 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,202 psi | 88% | 2687 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,463 psi | 88% | 2598 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,507 psi | 89% | 2828 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 1683 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,869 psi | 88% | 2644 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 56,739 psi | 89% | 2753 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,897 psi | 86% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,840 psi | 89% | 2641 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2776 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,129 psi | 86% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,143 psi | 85% | 2720 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 56,376 psi | 88% | 2710 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 1722 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,188 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,260 psi | 88% | 2795 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 56,478 psi | 89% | 2667 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 55,448 psi | 87% | 2677 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2595 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,797 psi | 89% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,157 psi | 85% | 2612 fps | 99.7% |
| Somchem S385 | <<locked>> | 84% | 55,840 psi | 88% | 2651 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,695 psi | 87% | 2641 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,578 psi | 86% | 2667 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 55,259 psi | 87% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,592 psi | 86% | 2726 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 55,506 psi | 87% | 2723 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 56,855 psi | 89% | 2795 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 94% | 54,143 psi | 85% | 2795 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,246 psi | 90% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,521 psi | 87% | 2651 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% | 45,179 psi | 71% | 2470 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 42,206 psi | 66% | 2523 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 44,425 psi | 70% | 2552 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 49,240 psi | 77% | 2589 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 44,469 psi | 70% | 2546 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 33,199 psi | 52% | 2310 fps | 96.2% |
| ADI AR 2218 | <<locked>> | 92% | 42,873 psi | 67% | 2608 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 30,516 psi | 48% | 2287 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,066 psi | 77% | 2582 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,223 psi | 71% | 2549 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,034 psi | 69% | 2480 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,232 psi | 60% | 2438 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,937 psi | 78% | 2644 fps | 100% |
| Alliant Reloder-33 | 87.5 gr | 88% | 40,814 psi | 64% | 2539 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 94% | 43,627 psi | 68% | 2592 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,482 psi | 67% | 2461 fps | 96.1% |
| Bofors RP15 | <<locked>> | 80% | 42,148 psi | 66% | 2490 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 35,708 psi | 56% | 2382 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 45,223 psi | 71% | 2549 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 36,056 psi | 56% | 2379 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 80% | 46,818 psi | 73% | 2539 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,151 psi | 72% | 2526 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,127 psi | 83% | 2556 fps | 100% |
| Hodgdon Retumbo | 73.8 gr | 80% | 37,362 psi | 59% | 2487 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1499 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,282 psi | 73% | 2487 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,236 psi | 68% | 2530 fps | 98.8% |
| IMR 8133 Enduron | <<locked>> | 84% | 32,184 psi | 50% | 2320 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 39,044 psi | 61% | 2359 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 28,195 psi | 44% | 2231 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 47,906 psi | 75% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,439 psi | 68% | 2546 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 39,030 psi | 61% | 2428 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 46% | 1539 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,448 psi | 57% | 2461 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,042 psi | 56% | 2425 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 49,792 psi | 78% | 2562 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 48,718 psi | 76% | 2572 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 44,309 psi | 69% | 2539 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,615 psi | 73% | 2530 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 50,633 psi | 79% | 2556 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 49,139 psi | 77% | 2552 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,047 psi | 67% | 2441 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 88% | 47,834 psi | 75% | 2559 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 48,617 psi | 76% | 2549 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,514 psi | 74% | 2612 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,784 psi | 62% | 2448 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 37,333 psi | 59% | 2438 fps | 95.7% |
| Vihtavuori N570 | 84.2 gr | 88% | 43,845 psi | 69% | 2608 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,743 psi | 67% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,208 psi | 71% | 2490 fps | 99.7% |
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 51 powders for .300 Norma Mag. loaded with the .308 | 230gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 2,877 fps; across all powders the maximum-charge window runs from 1,683 fps to 2,877 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 230.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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. Vihtavuori N570, Alliant Reloder-33, Hodgdon Retumbo rank at the top here: for .300 Norma Mag. with the .308 | 230gr | Sierra MatchKing 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.