Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 277gr | CutEdge MTAC bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP 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 3100 | <<locked>> | 96% | 55,622 psi | 87% | 2520 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,493 psi | 90% | 2546 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,201 psi | 85% | 2612 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 82% | 55,390 psi | 87% | 2461 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,737 psi | 86% | 2559 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 96% | 56,043 psi | 88% | 2615 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2470 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,307 psi | 65% | 2438 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,594 psi | 89% | 2480 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,969 psi | 86% | 2549 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,028 psi | 88% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,667 psi | 90% | 2595 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,796 psi | 87% | 2608 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,753 psi | 89% | 2572 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2585 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,305 psi | 90% | 2661 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,375 psi | 85% | 2530 fps | 96.9% |
| Bofors RP15 | <<locked>> | 98% | 54,694 psi | 86% | 2592 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 57,406 psi | 90% | 2493 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,196 psi | 76% | 2533 fps | 98.9% |
| Bofors RP5 | <<locked>> | 96% | 55,796 psi | 87% | 2608 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 56,550 psi | 89% | 2503 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2546 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 82% | 57,682 psi | 90% | 2520 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,695 psi | 87% | 2552 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 54,911 psi | 86% | 2513 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 94% | 56,014 psi | 88% | 2559 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,911 psi | 86% | 2543 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,071 psi | 86% | 2480 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,329 psi | 80% | 2648 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 56,101 psi | 88% | 2592 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1542 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,650 psi | 86% | 2493 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,636 psi | 86% | 2477 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 57,667 psi | 90% | 2536 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,116 psi | 90% | 2539 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 98% | 57,508 psi | 90% | 2644 fps | 99.6% |
| Lovex S065 | <<locked>> | 86% | 55,071 psi | 86% | 2474 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,608 psi | 89% | 2520 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2487 fps | 100% |
| Norma 204 | <<locked>> | 88% | 55,303 psi | 87% | 2543 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 36,637 psi | 57% | 2369 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 55,434 psi | 87% | 2625 fps | 100% |
| Norma URP | <<locked>> | 88% | 55,999 psi | 88% | 2533 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,331 psi | 85% | 2612 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 88% | 54,636 psi | 86% | 2539 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2605 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,276 psi | 90% | 2510 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,463 psi | 87% | 2546 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,580 psi | 90% | 2572 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,854 psi | 88% | 2598 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,532 psi | 81% | 2644 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,267 psi | 73% | 2539 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 84% | 57,740 psi | 90% | 2493 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,014 psi | 88% | 2530 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 94% | 57,087 psi | 89% | 2582 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 56,550 psi | 89% | 2503 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,071 psi | 86% | 2474 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,608 psi | 89% | 2520 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,709 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,447 psi | 85% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,317 psi | 85% | 2434 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,637 psi | 89% | 2579 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 57,319 psi | 90% | 2487 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,595 psi | 90% | 2526 fps | 99.1% |
| Somchem S365 | <<locked>> | 90% | 56,115 psi | 88% | 2533 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,638 psi | 90% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 55,172 psi | 86% | 2421 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,215 psi | 85% | 2480 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,261 psi | 90% | 2543 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 57,000 psi | 89% | 2533 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,317 psi | 87% | 2549 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,419 psi | 87% | 2625 fps | 99.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 2605 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,834 psi | 75% | 2549 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,421 psi | 90% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,912 psi | 88% | 2556 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,925 psi | 85% | 2648 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,725 psi | 90% | 2559 fps | 99.9% |
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% | 32,068 psi | 50% | 2136 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 43,540 psi | 68% | 2356 fps | 100% |
| Accurate MAGPRO | 75.7 gr | 86% | 40,843 psi | 64% | 2392 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 52,083 psi | 82% | 2418 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,637 psi | 57% | 2254 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 37,217 psi | 58% | 2293 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 35,752 psi | 56% | 2260 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 29,776 psi | 47% | 2172 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,185 psi | 83% | 2438 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,119 psi | 66% | 2365 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,544 psi | 76% | 2467 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,492 psi | 57% | 2247 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 32,343 psi | 51% | 2198 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,053 psi | 49% | 2165 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,050 psi | 42% | 2087 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,663 psi | 53% | 2283 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 48,037 psi | 75% | 2428 fps | 95.4% |
| Bofors RP15 | <<locked>> | 82% | 32,198 psi | 50% | 2192 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 53,882 psi | 84% | 2451 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 34,185 psi | 54% | 2270 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 32,343 psi | 51% | 2198 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 46,760 psi | 73% | 2362 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 34,127 psi | 53% | 2228 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 53,983 psi | 85% | 2474 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,585 psi | 71% | 2405 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 48,327 psi | 76% | 2418 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 39,871 psi | 62% | 2300 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 39,059 psi | 61% | 2287 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,668 psi | 62% | 2264 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 32,155 psi | 50% | 2257 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 44,730 psi | 70% | 2425 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1375 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,366 psi | 66% | 2306 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,356 psi | 76% | 2385 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 41,640 psi | 65% | 2310 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 39,059 psi | 61% | 2251 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 38,203 psi | 60% | 2326 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 45,658 psi | 72% | 2339 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 43,903 psi | 69% | 2329 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 27,557 psi | 43% | 2028 fps | 96% |
| Norma 204 | <<locked>> | 80% | 42,163 psi | 66% | 2339 fps | 98% |
| Norma 217 | <<locked>> | 94% | 30,124 psi | 47% | 2211 fps | 95.5% |
| Norma MRP | 69.1 gr | 80% | 33,634 psi | 53% | 2254 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 43,033 psi | 67% | 2349 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 35,201 psi | 55% | 2277 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 41,858 psi | 66% | 2346 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 31,082 psi | 49% | 2169 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1411 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,708 psi | 84% | 2461 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,663 psi | 81% | 2500 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,569 psi | 68% | 2375 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,989 psi | 66% | 2395 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 29,066 psi | 46% | 2178 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 39,769 psi | 62% | 2418 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 50,647 psi | 79% | 2405 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,985 psi | 60% | 2234 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 35,708 psi | 56% | 2234 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,760 psi | 73% | 2362 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,658 psi | 72% | 2339 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,903 psi | 69% | 2329 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,170 psi | 82% | 2461 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,111 psi | 80% | 2297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,657 psi | 70% | 2293 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,389 psi | 55% | 2228 fps | 96.5% |
| Somchem S355 | <<locked>> | 80% | 50,662 psi | 79% | 2402 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 38,551 psi | 60% | 2228 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 39,929 psi | 63% | 2310 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,318 psi | 57% | 2221 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 48,428 psi | 76% | 2336 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,440 psi | 70% | 2343 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 31,270 psi | 49% | 2110 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 43,845 psi | 69% | 2349 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 34,867 psi | 55% | 2231 fps | 99.8% |
| Vihtavuori N560 | 72.6 gr | 84% | 39,175 psi | 61% | 2356 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 36,274 psi | 57% | 2290 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 41,466 psi | 65% | 2434 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,526 psi | 68% | 2310 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,585 psi | 71% | 2405 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,369 psi | 43% | 2178 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 33,083 psi | 52% | 2156 fps | 95.4% |
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 85 powders for .338 Norma Mag. loaded with the .338 | 277gr | CutEdge MTAC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,661 fps. ADI AR 2217 gives the best case fill at 100 %, and 85 of the 85 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 277.0 gr projectile in 0.338" calls for a 1:10.0 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .338 Norma Mag. with the .338 | 277gr | CutEdge MTAC 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.