Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 220gr | Berger Long Range Hybrid Target bullet and 61 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 80 and Vihtavuori N570.
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% | 54,505 psi | 85% | 2657 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,014 psi | 89% | 2812 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 55,840 psi | 88% | 2736 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 53,954 psi | 85% | 2749 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 56,086 psi | 88% | 2782 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2828 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2805 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,231 psi | 88% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,434 psi | 87% | 2726 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,418 psi | 85% | 2746 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,159 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,260 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,710 psi | 89% | 2795 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2877 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 48,863 psi | 77% | 2733 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,737 psi | 86% | 2717 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 57,508 psi | 90% | 2789 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,927 psi | 88% | 2795 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 54,418 psi | 85% | 2746 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,711 psi | 90% | 2805 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,217 psi | 90% | 2743 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,956 psi | 88% | 2726 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,275 psi | 88% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,230 psi | 87% | 2864 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1699 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,839 psi | 86% | 2661 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,361 psi | 87% | 2661 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,638 psi | 90% | 2723 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,173 psi | 88% | 2789 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,951 psi | 78% | 2726 fps | 99.6% |
| Lovex S070 | <<locked>> | 82% | 56,971 psi | 89% | 2687 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,144 psi | 88% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,956 psi | 88% | 2717 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2749 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,404 psi | 85% | 2759 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,942 psi | 89% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,290 psi | 90% | 2812 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,912 psi | 88% | 2713 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,448 psi | 87% | 2743 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 1742 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,537 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,637 psi | 87% | 2854 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,013 psi | 86% | 2822 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 56,637 psi | 89% | 2710 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,303 psi | 87% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,971 psi | 89% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,595 psi | 90% | 2644 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,911 psi | 86% | 2717 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 54,215 psi | 85% | 2651 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 54,636 psi | 86% | 2657 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,637 psi | 87% | 2690 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,390 psi | 87% | 2680 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 54,056 psi | 85% | 2697 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 57,696 psi | 90% | 2697 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 54,636 psi | 86% | 2687 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 53,969 psi | 85% | 2762 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 54,563 psi | 86% | 2756 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 55,680 psi | 87% | 2822 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 56,768 psi | 89% | 2881 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,825 psi | 87% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,317 psi | 87% | 2690 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% | 41,771 psi | 65% | 2454 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 43,163 psi | 68% | 2572 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 45,759 psi | 72% | 2572 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 41,118 psi | 64% | 2520 fps | 97.7% |
| ADI AR 2217 | <<locked>> | 82% | 32,793 psi | 51% | 2333 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 45,237 psi | 71% | 2690 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 28,050 psi | 44% | 2247 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,779 psi | 83% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,730 psi | 72% | 2566 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,800 psi | 66% | 2526 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,625 psi | 64% | 2470 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,969 psi | 55% | 2411 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,513 psi | 71% | 2628 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 42,772 psi | 67% | 2621 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 45,368 psi | 71% | 2667 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,598 psi | 67% | 2497 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,986 psi | 61% | 2467 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 32,532 psi | 51% | 2346 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,800 psi | 66% | 2526 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 80% | 33,257 psi | 52% | 2346 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 43,758 psi | 69% | 2520 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,917 psi | 67% | 2503 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,574 psi | 78% | 2552 fps | 100% |
| Hodgdon Retumbo | 71.1 gr | 80% | 34,229 psi | 54% | 2448 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1516 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,401 psi | 81% | 2608 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,040 psi | 82% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,773 psi | 70% | 2510 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 39,798 psi | 62% | 2503 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,388 psi | 52% | 2392 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 53,635 psi | 84% | 2638 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,187 psi | 57% | 2343 fps | 99.3% |
| Norma 204 | <<locked>> | 80% | 52,199 psi | 82% | 2661 fps | 99.9% |
| Norma 217 | <<locked>> | 84% | 29,327 psi | 46% | 2303 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 44,208 psi | 69% | 2592 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,490 psi | 84% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,755 psi | 62% | 2516 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 80% | 52,214 psi | 82% | 2657 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,708 psi | 56% | 2402 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1555 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,548 psi | 84% | 2717 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,286 psi | 52% | 2425 fps | 98.4% |
| ReloadSwiss RS 80 | 82.5 gr | 86% | 37,811 psi | 59% | 2507 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 46,702 psi | 73% | 2549 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 45,382 psi | 71% | 2559 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,635 psi | 84% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,940 psi | 85% | 2592 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,049 psi | 71% | 2556 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 47,485 psi | 74% | 2539 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 51,068 psi | 80% | 2608 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,774 psi | 72% | 2536 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 39,929 psi | 63% | 2421 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 50,691 psi | 79% | 2641 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 54,128 psi | 85% | 2648 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,063 psi | 71% | 2539 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,990 psi | 69% | 2589 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 36,579 psi | 57% | 2418 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 39,218 psi | 61% | 2523 fps | 95.5% |
| Vihtavuori N570 | 84.9 gr | 92% | 45,934 psi | 72% | 2694 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,218 psi | 60% | 2523 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,003 psi | 66% | 2470 fps | 98.8% |
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 68 powders for .300 Norma Mag. loaded with the .308 | 220gr | Berger Long Range Hybrid Target. Vihtavuori N570 delivers the highest muzzle velocity at 2,881 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,881 fps. Accurate 8700 gives the best case fill at 100 %, and 68 of the 68 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 1:10.5 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 80, Vihtavuori N570 rank at the top here: for .300 Norma Mag. with the .308 | 220gr | Berger Long Range Hybrid Target 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.