Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 275gr | Peregrine Glider GRM bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Vihtavuori N560 and Norma MRP.
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>> | 96% | 54,157 psi | 85% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,999 psi | 88% | 2533 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,767 psi | 87% | 2648 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 96% | 56,623 psi | 89% | 2651 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 82% | 54,302 psi | 85% | 2451 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,898 psi | 89% | 2589 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 96% | 54,476 psi | 85% | 2595 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,295 psi | 71% | 2448 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,147 psi | 63% | 2418 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,405 psi | 87% | 2470 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,130 psi | 90% | 2585 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,563 psi | 86% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,231 psi | 88% | 2579 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,085 psi | 85% | 2589 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,187 psi | 86% | 2559 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2569 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,405 psi | 87% | 2644 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,608 psi | 89% | 2562 fps | 97.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 2621 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 56,188 psi | 88% | 2484 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,557 psi | 73% | 2513 fps | 98.5% |
| Bofors RP5 | <<locked>> | 96% | 54,085 psi | 85% | 2589 fps | 99.8% |
| Bofors RP7 | <<locked>> | 86% | 55,288 psi | 87% | 2487 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 2526 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 82% | 56,333 psi | 88% | 2507 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,389 psi | 85% | 2539 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 57,305 psi | 90% | 2549 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 94% | 54,665 psi | 86% | 2543 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,188 psi | 90% | 2575 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,319 psi | 90% | 2510 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,821 psi | 78% | 2628 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 54,404 psi | 85% | 2572 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 58% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,174 psi | 90% | 2477 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,826 psi | 89% | 2526 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,000 psi | 89% | 2510 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 56,318 psi | 88% | 2526 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,825 psi | 87% | 2526 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 98% | 55,840 psi | 88% | 2628 fps | 99.4% |
| Lovex S062 | <<locked>> | 82% | 57,551 psi | 90% | 2467 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,261 psi | 90% | 2503 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,347 psi | 87% | 2507 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2470 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,085 psi | 85% | 2530 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 35,505 psi | 56% | 2346 fps | 97.6% |
| Norma MRP | <<locked>> | 94% | 53,925 psi | 85% | 2612 fps | 100% |
| Norma URP | <<locked>> | 88% | 54,636 psi | 86% | 2520 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,681 psi | 89% | 2648 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 57,116 psi | 90% | 2579 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,491 psi | 85% | 2585 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,246 psi | 88% | 2497 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 53,867 psi | 84% | 2536 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,999 psi | 88% | 2559 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,273 psi | 85% | 2585 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 2625 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2516 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 56,521 psi | 89% | 2484 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,810 psi | 86% | 2516 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 94% | 55,825 psi | 87% | 2569 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,288 psi | 87% | 2487 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,261 psi | 90% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,551 psi | 90% | 2467 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,347 psi | 87% | 2507 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,592 psi | 86% | 2497 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,811 psi | 89% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,652 psi | 89% | 2467 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,361 psi | 87% | 2566 fps | 99.8% |
| Somchem S355 | <<locked>> | 84% | 56,173 psi | 88% | 2477 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,173 psi | 88% | 2510 fps | 98.8% |
| Somchem S365 | <<locked>> | 90% | 54,665 psi | 86% | 2520 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,231 psi | 88% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 57,609 psi | 90% | 2454 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,623 psi | 89% | 2513 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,637 psi | 87% | 2526 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 55,506 psi | 87% | 2520 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,290 psi | 90% | 2579 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 53,954 psi | 85% | 2608 fps | 98.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2582 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 46,238 psi | 72% | 2526 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,028 psi | 88% | 2477 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,389 psi | 85% | 2539 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,057 psi | 88% | 2684 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,362 psi | 88% | 2543 fps | 99.8% |
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% | 31,270 psi | 49% | 2123 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 42,525 psi | 67% | 2343 fps | 100% |
| Accurate High Country | 69.6 gr | 82% | 36,463 psi | 57% | 2320 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 39,682 psi | 62% | 2375 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 51,184 psi | 80% | 2411 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,708 psi | 56% | 2238 fps | 96.1% |
| ADI AR 2213 | <<locked>> | 86% | 38,856 psi | 61% | 2329 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 37,101 psi | 58% | 2290 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 29,022 psi | 45% | 2152 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,011 psi | 82% | 2428 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,176 psi | 65% | 2356 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,152 psi | 74% | 2454 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,708 psi | 56% | 2234 fps | 96.2% |
| Alliant Reloder-22 | <<locked>> | 82% | 33,605 psi | 53% | 2231 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,124 psi | 47% | 2149 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,339 psi | 41% | 2067 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,547 psi | 51% | 2267 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,053 psi | 78% | 2464 fps | 95.6% |
| Bofors RP15 | <<locked>> | 84% | 33,475 psi | 52% | 2228 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 52,678 psi | 83% | 2441 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 35,447 psi | 56% | 2303 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 33,605 psi | 53% | 2231 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 45,890 psi | 72% | 2349 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 35,534 psi | 56% | 2260 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 52,852 psi | 83% | 2461 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,498 psi | 70% | 2392 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 47,268 psi | 74% | 2405 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 38,812 psi | 61% | 2283 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,799 psi | 64% | 2323 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,551 psi | 60% | 2251 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,475 psi | 52% | 2297 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 43,540 psi | 68% | 2411 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 43% | 1371 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,882 psi | 84% | 2438 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,379 psi | 65% | 2290 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,355 psi | 74% | 2372 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 40,582 psi | 64% | 2300 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 38,203 psi | 60% | 2238 fps | 95% |
| IMR 7828 SSC | <<locked>> | 86% | 37,188 psi | 58% | 2306 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 54,041 psi | 85% | 2428 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,614 psi | 70% | 2326 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 43,047 psi | 67% | 2320 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 26,774 psi | 42% | 2011 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 41,147 psi | 64% | 2326 fps | 97.6% |
| Norma 217 | <<locked>> | 96% | 31,096 psi | 49% | 2241 fps | 95.8% |
| Norma MRP | 67.9 gr | 80% | 32,706 psi | 51% | 2238 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 42,105 psi | 66% | 2336 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 36,753 psi | 58% | 2313 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 40,857 psi | 64% | 2333 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 86% | 32,445 psi | 51% | 2205 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,050 psi | 44% | 1404 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,678 psi | 83% | 2451 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,096 psi | 79% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,453 psi | 67% | 2365 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,828 psi | 64% | 2379 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,255 psi | 47% | 2215 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 41,582 psi | 65% | 2461 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 49,647 psi | 78% | 2398 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,072 psi | 58% | 2221 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 34,882 psi | 55% | 2221 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 45,890 psi | 72% | 2349 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,614 psi | 70% | 2326 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 54,041 psi | 85% | 2428 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,047 psi | 67% | 2320 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,068 psi | 80% | 2451 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,198 psi | 79% | 2290 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,700 psi | 68% | 2283 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,563 psi | 54% | 2215 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 49,516 psi | 78% | 2392 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 40,147 psi | 63% | 2260 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 38,740 psi | 61% | 2297 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,389 psi | 55% | 2208 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,543 psi | 75% | 2329 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,540 psi | 68% | 2333 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,648 psi | 51% | 2146 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 42,786 psi | 67% | 2336 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 33,808 psi | 53% | 2215 fps | 99.6% |
| Vihtavuori N560 | 71.3 gr | 84% | 38,087 psi | 60% | 2336 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 37,637 psi | 59% | 2323 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 43,062 psi | 67% | 2467 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,409 psi | 66% | 2300 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,498 psi | 70% | 2392 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,600 psi | 42% | 2159 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 34,490 psi | 54% | 2188 fps | 95.7% |
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 89 powders for .338 Norma Mag. loaded with the .338 | 275gr | Peregrine Glider GRM. Winchester StaBALL HD delivers the highest muzzle velocity at 2,684 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,684 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Accurate High Country, Vihtavuori N560, Norma MRP rank at the top here: for .338 Norma Mag. with the .338 | 275gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.