Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 226gr | Peregrine Glider GRM bullet and 71 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>> | 90% | 54,607 psi | 86% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,564 psi | 87% | 2638 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,334 psi | 90% | 2779 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 88% | 56,608 psi | 89% | 2707 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 54,592 psi | 86% | 2720 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 2749 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,675 psi | 76% | 2723 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2713 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,739 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,956 psi | 89% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,101 psi | 88% | 2697 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 54,868 psi | 86% | 2713 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,507 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,318 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,898 psi | 89% | 2762 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2779 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,608 psi | 87% | 2690 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 54,085 psi | 85% | 2703 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 55,825 psi | 87% | 2759 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 54,868 psi | 86% | 2713 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,130 psi | 90% | 2638 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,244 psi | 85% | 2717 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,232 psi | 90% | 2694 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,157 psi | 85% | 2661 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,782 psi | 89% | 2697 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,043 psi | 89% | 2615 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,303 psi | 87% | 2828 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,738 psi | 87% | 2631 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,956 psi | 88% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 54,897 psi | 86% | 2638 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 56,666 psi | 89% | 2756 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,108 psi | 72% | 2628 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 55,869 psi | 88% | 2605 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,740 psi | 90% | 2654 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,927 psi | 88% | 2638 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,869 psi | 89% | 2690 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2654 fps | 100% |
| Norma MRP | <<locked>> | 88% | 54,781 psi | 86% | 2730 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,667 psi | 90% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,696 psi | 90% | 2779 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 56,637 psi | 89% | 2684 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,869 psi | 88% | 2713 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,811 psi | 87% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,389 psi | 85% | 2690 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,637 psi | 87% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,926 psi | 86% | 2785 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 88% | 57,479 psi | 90% | 2677 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 88% | 55,869 psi | 88% | 2690 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,130 psi | 90% | 2638 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,869 psi | 88% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,740 psi | 90% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,723 psi | 86% | 2562 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,463 psi | 87% | 2684 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 54,984 psi | 86% | 2621 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,056 psi | 86% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,999 psi | 88% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,637 psi | 87% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,898 psi | 88% | 2648 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 54,375 psi | 85% | 2664 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 54,795 psi | 86% | 2618 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,882 psi | 86% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,462 psi | 85% | 2733 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 54,679 psi | 86% | 2720 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 55,695 psi | 87% | 2785 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2844 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 54,911 psi | 86% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,464 psi | 90% | 2697 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,622 psi | 87% | 2762 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,883 psi | 88% | 2657 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% | 38,870 psi | 61% | 2369 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 51,851 psi | 81% | 2585 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,176 psi | 63% | 2480 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,207 psi | 68% | 2490 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 38,566 psi | 60% | 2431 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 32,706 psi | 51% | 2300 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 45,237 psi | 71% | 2654 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 27,760 psi | 44% | 2211 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,642 psi | 68% | 2490 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,067 psi | 78% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,236 psi | 68% | 2487 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,015 psi | 61% | 2438 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,927 psi | 59% | 2392 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,489 psi | 51% | 2323 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,119 psi | 66% | 2536 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 45,730 psi | 72% | 2644 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,236 psi | 68% | 2470 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,376 psi | 57% | 2379 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 32,169 psi | 50% | 2313 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 39,015 psi | 61% | 2438 fps | 98.3% |
| Bofors RP7 | <<locked>> | 80% | 53,737 psi | 84% | 2589 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,330 psi | 52% | 2316 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 53,577 psi | 84% | 2641 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,234 psi | 65% | 2438 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,393 psi | 63% | 2421 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,862 psi | 73% | 2477 fps | 100% |
| Hodgdon Retumbo | 67.4 gr | 80% | 31,821 psi | 50% | 2352 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 44% | 1476 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,965 psi | 77% | 2533 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,182 psi | 77% | 2536 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,511 psi | 67% | 2431 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 37,289 psi | 58% | 2415 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,895 psi | 52% | 2352 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 52,605 psi | 82% | 2559 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,937 psi | 80% | 2559 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,475 psi | 52% | 2254 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 49,588 psi | 78% | 2579 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 28,616 psi | 45% | 2257 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,191 psi | 65% | 2503 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 50,647 psi | 79% | 2572 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,927 psi | 58% | 2421 fps | 97% |
| Ramshot Hunter | <<locked>> | 80% | 49,516 psi | 78% | 2579 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,866 psi | 52% | 2306 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1512 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,011 psi | 82% | 2612 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,575 psi | 79% | 2635 fps | 100% |
| ReloadSwiss RS 76 | 72.1 gr | 80% | 30,690 psi | 48% | 2326 fps | 97.4% |
| ReloadSwiss RS 80 | 80 gr | 88% | 37,362 psi | 59% | 2470 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,440 psi | 70% | 2470 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 42,699 psi | 67% | 2474 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 80% | 53,737 psi | 84% | 2589 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,605 psi | 82% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,937 psi | 80% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,430 psi | 81% | 2516 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,366 psi | 66% | 2470 fps | 99% |
| Somchem S361 | <<locked>> | 80% | 45,078 psi | 71% | 2461 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 47,979 psi | 75% | 2526 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,989 psi | 67% | 2451 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,069 psi | 82% | 2562 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,463 psi | 59% | 2339 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 50,908 psi | 80% | 2608 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 51,343 psi | 80% | 2572 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,148 psi | 66% | 2457 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,147 psi | 64% | 2500 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 82% | 36,274 psi | 57% | 2385 fps | 96% |
| Vihtavuori N568 | <<locked>> | 88% | 38,798 psi | 61% | 2484 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 94% | 45,687 psi | 72% | 2654 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,256 psi | 80% | 2523 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,577 psi | 84% | 2641 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,954 psi | 55% | 2434 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,465 psi | 62% | 2388 fps | 98.3% |
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 71 powders for .300 Norma Mag. loaded with the .308 | 226gr | Peregrine Glider GRM. Vihtavuori N570 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,844 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 226.0 gr projectile in 0.308" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 | 226gr | Peregrine Glider GRM 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.