Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 245gr | Berger Long Range Hybrid Target bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Alliant Reloder-33.
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% | 57,406 psi | 90% | 2552 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,492 psi | 87% | 2651 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,231 psi | 88% | 2661 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 84% | 55,027 psi | 86% | 2582 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,043 psi | 89% | 2651 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 55,463 psi | 87% | 2635 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 2753 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 98% | 54,230 psi | 85% | 2654 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,245 psi | 87% | 2579 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,665 psi | 86% | 2572 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,464 psi | 90% | 2644 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,811 psi | 87% | 2556 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,811 psi | 87% | 2628 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,246 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,058 psi | 89% | 2730 fps | 99.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2664 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,319 psi | 90% | 2618 fps | 99.2% |
| Bofors RP15 | <<locked>> | 90% | 56,855 psi | 89% | 2635 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,463 psi | 87% | 2648 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,464 psi | 90% | 2644 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,087 psi | 89% | 2651 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,202 psi | 88% | 2589 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,158 psi | 86% | 2575 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,521 psi | 87% | 2490 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,824 psi | 86% | 2710 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 1604 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,232 psi | 90% | 2549 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,550 psi | 89% | 2566 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 88% | 55,463 psi | 87% | 2638 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 55,013 psi | 86% | 2526 fps | 96% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,316 psi | 84% | 2641 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 55,492 psi | 87% | 2526 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 2661 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,682 psi | 90% | 2661 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,681 psi | 89% | 2657 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,940 psi | 86% | 2595 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 61% | 1644 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,317 psi | 87% | 2700 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,447 psi | 85% | 2674 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 55,622 psi | 87% | 2552 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 54,360 psi | 85% | 2566 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 46,021 psi | 72% | 2484 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,580 psi | 90% | 2612 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,768 psi | 89% | 2552 fps | 99.9% |
| Somchem S365 | <<locked>> | 82% | 57,580 psi | 90% | 2543 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,766 psi | 86% | 2539 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,549 psi | 85% | 2530 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,942 psi | 89% | 2608 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 84% | 54,186 psi | 85% | 2533 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,072 psi | 89% | 2667 fps | 100% |
| Vihtavuori N565 | <<locked>> | 90% | 54,128 psi | 85% | 2612 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 55,376 psi | 87% | 2677 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 96% | 56,463 psi | 88% | 2736 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,738 psi | 87% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,375 psi | 85% | 2536 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% | 44,237 psi | 69% | 2365 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 48,312 psi | 76% | 2539 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 45,788 psi | 72% | 2493 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 48,254 psi | 76% | 2480 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 43,424 psi | 68% | 2434 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 32,416 psi | 51% | 2211 fps | 96.3% |
| ADI AR 2218 | <<locked>> | 92% | 41,582 psi | 65% | 2497 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 29,733 psi | 47% | 2188 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,602 psi | 76% | 2480 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,138 psi | 75% | 2474 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,179 psi | 69% | 2441 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,062 psi | 67% | 2375 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,289 psi | 58% | 2333 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,617 psi | 76% | 2533 fps | 100% |
| Alliant Reloder-33 | 81.6 gr | 88% | 39,653 psi | 62% | 2434 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 42,192 psi | 66% | 2484 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,829 psi | 66% | 2362 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 41,147 psi | 64% | 2385 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 34,838 psi | 55% | 2283 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 44,179 psi | 69% | 2441 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 35,157 psi | 55% | 2277 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 46,050 psi | 72% | 2434 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,179 psi | 71% | 2418 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,025 psi | 82% | 2444 fps | 100% |
| Hodgdon Retumbo | 68.7 gr | 80% | 36,347 psi | 57% | 2382 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 45% | 1427 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,809 psi | 84% | 2507 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,905 psi | 74% | 2418 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,293 psi | 66% | 2425 fps | 98.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 51,648 psi | 81% | 2474 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 84% | 31,227 psi | 49% | 2221 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,145 psi | 60% | 2257 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 27,485 psi | 43% | 2139 fps | 96.4% |
| Norma MRP | <<locked>> | 80% | 46,833 psi | 73% | 2500 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,293 psi | 66% | 2434 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,130 psi | 60% | 2329 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,269 psi | 46% | 1467 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,549 psi | 56% | 2362 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 34,911 psi | 55% | 2320 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 48,965 psi | 77% | 2454 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 47,688 psi | 75% | 2464 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 43,062 psi | 67% | 2431 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,355 psi | 74% | 2461 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 49,748 psi | 78% | 2448 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 53,925 psi | 85% | 2500 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,095 psi | 75% | 2441 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,192 psi | 66% | 2339 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 88% | 46,818 psi | 73% | 2451 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 47,659 psi | 75% | 2441 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,485 psi | 73% | 2503 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 38,754 psi | 61% | 2346 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 36,303 psi | 57% | 2336 fps | 95.8% |
| Vihtavuori N570 | 78.5 gr | 88% | 42,656 psi | 67% | 2500 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,394 psi | 65% | 2438 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,309 psi | 69% | 2385 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 55 powders for .300 Norma Mag. loaded with the .308 | 245gr | Berger Long Range Hybrid Target. ADI AR 2218 delivers the highest muzzle velocity at 2,753 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,753 fps. ADI AR 2218 gives the best case fill at 100 %, and 55 of the 55 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 245.0 gr projectile in 0.308" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, Hodgdon TrailBoss 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for .300 Norma Mag. with the .308 | 245gr | Berger Long Range Hybrid Target 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.