Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 220gr | Nosler Custom Competition bullet and 58 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,376 psi | 87% | 2671 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,012 psi | 85% | 2769 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,550 psi | 89% | 2749 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 54,853 psi | 86% | 2766 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 57,130 psi | 90% | 2799 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2848 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,434 psi | 87% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,072 psi | 89% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,260 psi | 88% | 2743 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,317 psi | 87% | 2759 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,101 psi | 89% | 2720 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,159 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,711 psi | 90% | 2808 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,621 psi | 86% | 2831 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2753 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,332 psi | 87% | 2730 fps | 98.3% |
| Bofors RP15 | <<locked>> | 90% | 54,708 psi | 86% | 2753 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,782 psi | 89% | 2812 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,317 psi | 87% | 2759 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 54,810 psi | 86% | 2766 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,143 psi | 85% | 2700 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,782 psi | 89% | 2743 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,058 psi | 89% | 2657 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,173 psi | 88% | 2877 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,477 psi | 87% | 2674 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,072 psi | 88% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,665 psi | 86% | 2680 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 57,029 psi | 89% | 2805 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,952 psi | 80% | 2743 fps | 99.7% |
| Lovex S070 | <<locked>> | 82% | 57,711 psi | 90% | 2697 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,029 psi | 89% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,623 psi | 89% | 2730 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,721 psi | 81% | 2762 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,317 psi | 87% | 2776 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,682 psi | 90% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,244 psi | 85% | 2769 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 56,608 psi | 89% | 2726 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,492 psi | 89% | 2759 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,695 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,985 psi | 88% | 2838 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 57,319 psi | 90% | 2723 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,028 psi | 88% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,711 psi | 90% | 2697 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,637 psi | 87% | 2730 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 54,955 psi | 86% | 2664 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 55,405 psi | 87% | 2667 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,275 psi | 88% | 2703 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,217 psi | 88% | 2694 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 54,926 psi | 86% | 2713 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 86% | 55,579 psi | 87% | 2700 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,839 psi | 86% | 2779 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 55,550 psi | 87% | 2772 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 56,652 psi | 89% | 2838 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 96% | 53,998 psi | 85% | 2838 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,913 psi | 89% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,086 psi | 88% | 2703 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% | 42,467 psi | 67% | 2467 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 43,845 psi | 69% | 2589 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 46,470 psi | 73% | 2585 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 41,742 psi | 65% | 2536 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 33,286 psi | 52% | 2349 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 96% | 45,948 psi | 72% | 2710 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 28,514 psi | 45% | 2260 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,403 psi | 84% | 2684 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,383 psi | 73% | 2582 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,453 psi | 67% | 2539 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,176 psi | 65% | 2480 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,607 psi | 56% | 2428 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,427 psi | 73% | 2641 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,613 psi | 68% | 2638 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,398 psi | 73% | 2687 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,149 psi | 68% | 2510 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 39,508 psi | 62% | 2480 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 33,156 psi | 52% | 2362 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,453 psi | 67% | 2539 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 33,794 psi | 53% | 2362 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,222 psi | 69% | 2533 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,569 psi | 68% | 2520 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,343 psi | 79% | 2566 fps | 100% |
| Hodgdon Retumbo | 72.1 gr | 80% | 34,824 psi | 55% | 2464 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 45% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,098 psi | 82% | 2621 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,605 psi | 82% | 2625 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,368 psi | 71% | 2523 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,466 psi | 63% | 2516 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,953 psi | 53% | 2405 fps | 95.7% |
| Lovex S070 | <<locked>> | 80% | 54,186 psi | 85% | 2648 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,695 psi | 57% | 2352 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 52,837 psi | 83% | 2674 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 27,992 psi | 44% | 2260 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 44,904 psi | 70% | 2605 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 54,070 psi | 85% | 2661 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,437 psi | 63% | 2530 fps | 98% |
| Ramshot Hunter | <<locked>> | 80% | 52,910 psi | 83% | 2674 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,318 psi | 57% | 2415 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 46% | 1558 fps | 100% |
| ReloadSwiss RS 76 | 77.1 gr | 80% | 33,823 psi | 53% | 2438 fps | 98.6% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 38,537 psi | 60% | 2523 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,384 psi | 74% | 2562 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 45,905 psi | 72% | 2572 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,186 psi | 85% | 2648 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,571 psi | 71% | 2566 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 48,196 psi | 76% | 2556 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 51,851 psi | 81% | 2618 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,441 psi | 73% | 2549 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 40,524 psi | 64% | 2434 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 48,182 psi | 76% | 2602 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 45,818 psi | 72% | 2556 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,643 psi | 70% | 2602 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 37,072 psi | 58% | 2431 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 86% | 39,813 psi | 62% | 2536 fps | 95.8% |
| Vihtavuori N570 | 86 gr | 92% | 46,717 psi | 73% | 2710 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,044 psi | 61% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,641 psi | 67% | 2484 fps | 99% |
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 65 powders for .300 Norma Mag. loaded with the .308 | 220gr | Nosler Custom Competition. Hodgdon Retumbo delivers the highest muzzle velocity at 2,877 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,877 fps. Accurate 8700 gives the best case fill at 100 %, and 65 of the 65 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 1:11.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Norma Mag. with the .308 | 220gr | Nosler Custom Competition 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.