Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 245gr | Peregrine Glider GRM bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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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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 2700 | <<locked>> | 82% | 55,927 psi | 88% | 2615 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 54,607 psi | 86% | 2664 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,376 psi | 87% | 2585 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,797 psi | 89% | 2703 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,334 psi | 90% | 2812 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 55,506 psi | 87% | 2625 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,070 psi | 85% | 2703 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 98% | 55,259 psi | 87% | 2756 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,855 psi | 59% | 2497 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,391 psi | 88% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,579 psi | 89% | 2667 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,740 psi | 90% | 2756 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,201 psi | 87% | 2723 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,058 psi | 89% | 2743 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,621 psi | 86% | 2749 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 2726 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,921 psi | 75% | 2674 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,985 psi | 88% | 2815 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 2733 fps | 99.2% |
| Bofors RP3 | <<locked>> | 84% | 57,174 psi | 90% | 2657 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,613 psi | 68% | 2602 fps | 96.9% |
| Bofors RP5 | <<locked>> | 98% | 54,621 psi | 86% | 2749 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 56,478 psi | 89% | 2657 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2625 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 84% | 57,522 psi | 90% | 2680 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,172 psi | 86% | 2707 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 54,839 psi | 86% | 2667 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 55,608 psi | 87% | 2703 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,288 psi | 85% | 2684 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,360 psi | 85% | 2635 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2723 fps | 99% |
| Hodgdon Superformance | <<locked>> | 88% | 55,535 psi | 87% | 2743 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1644 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,810 psi | 86% | 2605 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,159 psi | 90% | 2644 fps | 99.9% |
| IMR 4350 | <<locked>> | 90% | 54,215 psi | 85% | 2644 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,694 psi | 86% | 2631 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 57,058 psi | 89% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,884 psi | 89% | 2687 fps | 98.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2789 fps | 98.8% |
| Lovex S062 | <<locked>> | 82% | 55,100 psi | 86% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,766 psi | 86% | 2628 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,202 psi | 88% | 2671 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2575 fps | 99.8% |
| Norma 203B | <<locked>> | 82% | 55,883 psi | 88% | 2651 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,984 psi | 86% | 2694 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 54,433 psi | 85% | 2772 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 55,347 psi | 87% | 2687 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,826 psi | 89% | 2677 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,464 psi | 90% | 2808 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 90% | 54,128 psi | 85% | 2694 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,184 psi | 80% | 2687 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,260 psi | 58% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,348 psi | 90% | 2667 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,636 psi | 86% | 2710 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,753 psi | 89% | 2726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,129 psi | 86% | 2756 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2717 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 56,898 psi | 89% | 2605 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,464 psi | 90% | 2654 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,579 psi | 87% | 2674 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 96% | 56,391 psi | 88% | 2733 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 56,478 psi | 89% | 2657 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,766 psi | 86% | 2628 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,100 psi | 86% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,202 psi | 88% | 2671 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,521 psi | 87% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,592 psi | 86% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,230 psi | 85% | 2585 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,927 psi | 88% | 2726 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 57,276 psi | 90% | 2651 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,217 psi | 90% | 2671 fps | 98.2% |
| Somchem S365 | <<locked>> | 92% | 55,100 psi | 86% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,884 psi | 89% | 2707 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 57,551 psi | 90% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,638 psi | 90% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,042 psi | 86% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,566 psi | 90% | 2684 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 2684 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 82% | 55,782 psi | 87% | 2579 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,420 psi | 88% | 2687 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,302 psi | 85% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,534 psi | 85% | 2769 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2680 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,232 psi | 90% | 2648 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,376 psi | 87% | 2710 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,130 psi | 90% | 2703 fps | 99.4% |
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 2700 | <<locked>> | 80% | 52,286 psi | 82% | 2562 fps | 99.3% |
| Accurate 3100 | <<locked>> | 80% | 29,327 psi | 46% | 2201 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 51,851 psi | 81% | 2539 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,132 psi | 63% | 2444 fps | 99.6% |
| Accurate MAGPRO | 83 gr | 92% | 46,209 psi | 72% | 2635 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,994 psi | 77% | 2530 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,798 psi | 61% | 2434 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 90% | 42,221 psi | 66% | 2530 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 96% | 33,272 psi | 52% | 2382 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,719 psi | 78% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,055 psi | 83% | 2615 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,943 psi | 61% | 2457 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,599 psi | 70% | 2569 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,172 psi | 57% | 2375 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,419 psi | 57% | 2425 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,456 psi | 45% | 2231 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,398 psi | 45% | 2244 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,589 psi | 48% | 2343 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 38,435 psi | 60% | 2467 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 50,067 psi | 78% | 2562 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,058 psi | 60% | 2490 fps | 95.1% |
| Bofors RP5 | <<locked>> | 86% | 36,419 psi | 57% | 2425 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,787 psi | 69% | 2454 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 38,537 psi | 60% | 2451 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 50,299 psi | 79% | 2579 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,061 psi | 66% | 2490 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 45,005 psi | 71% | 2510 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 90% | 45,208 psi | 71% | 2536 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,309 psi | 69% | 2520 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,535 psi | 57% | 2352 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,027 psi | 56% | 2484 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 41,017 psi | 64% | 2507 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,532 psi | 81% | 2559 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,650 psi | 84% | 2592 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 39,436 psi | 62% | 2392 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,411 psi | 71% | 2484 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 38,392 psi | 60% | 2398 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,251 psi | 69% | 2484 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 40,379 psi | 63% | 2507 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 51,663 psi | 81% | 2552 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,714 psi | 67% | 2434 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 40,872 psi | 64% | 2421 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 28,732 psi | 45% | 2185 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,417 psi | 82% | 2602 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,030 psi | 61% | 2418 fps | 95.8% |
| Norma MRP | 72.6 gr | 82% | 33,054 psi | 52% | 2372 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 39,755 psi | 62% | 2438 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,084 psi | 83% | 2628 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 39,914 psi | 63% | 2510 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 38,667 psi | 61% | 2431 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 90% | 35,360 psi | 55% | 2395 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 44% | 1503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,328 psi | 79% | 2569 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,384 psi | 74% | 2612 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,972 psi | 63% | 2464 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,638 psi | 61% | 2477 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 32,837 psi | 51% | 2402 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 53,359 psi | 84% | 2559 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,079 psi | 74% | 2513 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,321 psi | 63% | 2418 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 37,652 psi | 59% | 2411 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,787 psi | 69% | 2454 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,714 psi | 67% | 2434 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 51,663 psi | 81% | 2552 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,872 psi | 64% | 2421 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,602 psi | 76% | 2569 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,225 psi | 76% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,713 psi | 65% | 2385 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,304 psi | 58% | 2405 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 47,326 psi | 74% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,772 psi | 69% | 2457 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,376 psi | 57% | 2398 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,388 psi | 52% | 2290 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 54,056 psi | 85% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,070 psi | 85% | 2533 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,208 psi | 71% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,292 psi | 65% | 2438 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 35,331 psi | 55% | 2329 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 52,199 psi | 82% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,524 psi | 64% | 2438 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 31,618 psi | 50% | 2300 fps | 98.4% |
| Vihtavuori N560 | 79.7 gr | 90% | 44,280 psi | 69% | 2595 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 94% | 40,509 psi | 63% | 2513 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,205 psi | 63% | 2405 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,235 psi | 66% | 2493 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,019 psi | 39% | 2221 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,478 psi | 59% | 2379 fps | 95.5% |
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 88 powders for .338 Norma Mag. loaded with the .338 | 245gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,815 fps. ADI AR 2225 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 245.0 gr projectile in 0.338" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Norma Mag. with the .338 | 245gr | 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.