Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 220gr | Rhino Solid Shank bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 88% | 55,985 psi | 88% | 2680 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,766 psi | 86% | 2782 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 57,145 psi | 90% | 2759 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,463 psi | 87% | 2776 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 57,653 psi | 90% | 2808 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 2861 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 2828 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,595 psi | 90% | 2740 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,666 psi | 89% | 2749 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,898 psi | 88% | 2769 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,740 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,056 psi | 85% | 2749 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,346 psi | 85% | 2762 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,274 psi | 87% | 2841 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 2766 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,970 psi | 88% | 2740 fps | 98.4% |
| Bofors RP15 | <<locked>> | 90% | 55,303 psi | 87% | 2759 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 57,537 psi | 90% | 2822 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,898 psi | 88% | 2769 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,390 psi | 87% | 2772 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,723 psi | 86% | 2713 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,334 psi | 90% | 2753 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,725 psi | 90% | 2667 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,797 psi | 89% | 2887 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 1709 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,898 psi | 88% | 2680 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,550 psi | 89% | 2680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,216 psi | 87% | 2690 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 57,682 psi | 90% | 2815 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2753 fps | 99.7% |
| Lovex S071 | <<locked>> | 94% | 57,624 psi | 90% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,014 psi | 89% | 2736 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2776 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,927 psi | 88% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,882 psi | 86% | 2779 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,000 psi | 89% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,305 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,754 psi | 61% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,740 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,898 psi | 89% | 2851 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 57,682 psi | 90% | 2726 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,637 psi | 89% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,231 psi | 88% | 2740 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,434 psi | 87% | 2671 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 55,927 psi | 88% | 2674 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,869 psi | 89% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,753 psi | 89% | 2703 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,579 psi | 87% | 2726 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 86% | 56,057 psi | 88% | 2707 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,419 psi | 87% | 2789 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 56,115 psi | 88% | 2782 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 57,377 psi | 90% | 2851 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 96% | 54,737 psi | 86% | 2848 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,653 psi | 90% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,652 psi | 89% | 2713 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% | 42,888 psi | 67% | 2474 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,396 psi | 70% | 2598 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 46,891 psi | 73% | 2595 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,163 psi | 66% | 2543 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 33,620 psi | 53% | 2356 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 96% | 46,673 psi | 73% | 2723 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 28,834 psi | 45% | 2270 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,925 psi | 85% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,818 psi | 73% | 2589 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,888 psi | 67% | 2549 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,626 psi | 65% | 2490 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,013 psi | 56% | 2434 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,891 psi | 73% | 2651 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 44,237 psi | 69% | 2648 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,021 psi | 74% | 2700 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,569 psi | 68% | 2520 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 39,914 psi | 63% | 2487 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 33,576 psi | 53% | 2372 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 42,888 psi | 67% | 2549 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,127 psi | 53% | 2372 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,788 psi | 70% | 2543 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,947 psi | 69% | 2526 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,821 psi | 80% | 2575 fps | 100% |
| Hodgdon Retumbo | 72.8 gr | 80% | 35,201 psi | 55% | 2474 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,369 psi | 44% | 1526 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,518 psi | 82% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,055 psi | 83% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,774 psi | 72% | 2533 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 40,872 psi | 64% | 2526 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,447 psi | 54% | 2415 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 37,086 psi | 58% | 2362 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 53,476 psi | 84% | 2684 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,355 psi | 44% | 2274 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 45,527 psi | 71% | 2618 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 40,872 psi | 64% | 2539 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 53,548 psi | 84% | 2684 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,709 psi | 58% | 2425 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1562 fps | 100% |
| ReloadSwiss RS 76 | 77.9 gr | 80% | 34,272 psi | 54% | 2448 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 36,274 psi | 57% | 2470 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 47,790 psi | 75% | 2572 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,528 psi | 73% | 2582 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,195 psi | 72% | 2579 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 48,544 psi | 76% | 2562 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 52,359 psi | 82% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,847 psi | 73% | 2559 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 40,930 psi | 64% | 2444 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 48,602 psi | 76% | 2608 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 46,311 psi | 73% | 2562 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,237 psi | 71% | 2615 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 37,594 psi | 59% | 2444 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 37,710 psi | 59% | 2490 fps | 95% |
| Vihtavuori N570 | 85 gr | 90% | 44,135 psi | 69% | 2657 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,740 psi | 62% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,178 psi | 68% | 2493 fps | 99.1% |
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 62 powders for .300 Norma Mag. loaded with the .308 | 220gr | Rhino Solid Shank. Hodgdon Retumbo delivers the highest muzzle velocity at 2,887 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,887 fps. Accurate 8700 gives the best case fill at 100 %, and 62 of the 62 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 1:12.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Norma Mag. with the .308 | 220gr | Rhino Solid Shank they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT 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.