Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 300gr | Lapua Scenar bullet and 88 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.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 56,971 psi | 89% | 2375 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 55,825 psi | 87% | 2434 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,043 psi | 89% | 2343 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,360 psi | 85% | 2418 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,215 psi | 85% | 2530 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 84% | 56,550 psi | 89% | 2379 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,897 psi | 86% | 2470 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 56,115 psi | 88% | 2523 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,830 psi | 69% | 2339 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,754 psi | 61% | 2313 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,667 psi | 90% | 2398 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,740 psi | 90% | 2418 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,042 psi | 86% | 2461 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,289 psi | 88% | 2477 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,476 psi | 85% | 2464 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,550 psi | 87% | 2520 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 2484 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,762 psi | 76% | 2454 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,623 psi | 89% | 2572 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,810 psi | 86% | 2444 fps | 97.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2507 fps | 99.9% |
| Bofors RP3 | <<locked>> | 82% | 54,853 psi | 86% | 2369 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,686 psi | 70% | 2405 fps | 98.6% |
| Bofors RP5 | <<locked>> | 98% | 55,550 psi | 87% | 2520 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 57,508 psi | 90% | 2418 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,153 psi | 75% | 2411 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 82% | 55,114 psi | 86% | 2392 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,275 psi | 88% | 2467 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,695 psi | 87% | 2431 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 96% | 56,362 psi | 88% | 2470 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,129 psi | 86% | 2457 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,390 psi | 87% | 2392 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,819 psi | 75% | 2510 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 56,333 psi | 88% | 2507 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 58% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,883 psi | 88% | 2359 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,201 psi | 87% | 2408 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,680 psi | 87% | 2395 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 54,636 psi | 86% | 2408 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,711 psi | 90% | 2454 fps | 99.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2552 fps | 99.7% |
| Lovex S062 | <<locked>> | 82% | 56,405 psi | 88% | 2352 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,970 psi | 88% | 2392 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,276 psi | 90% | 2431 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2362 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,029 psi | 89% | 2405 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,941 psi | 88% | 2461 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 34,345 psi | 54% | 2251 fps | 97.9% |
| Norma MRP | <<locked>> | 96% | 55,201 psi | 87% | 2539 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,376 psi | 88% | 2444 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,143 psi | 85% | 2520 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 55,143 psi | 86% | 2457 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2464 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,781 psi | 86% | 2382 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,898 psi | 88% | 2464 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,157 psi | 85% | 2441 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,144 psi | 88% | 2516 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,747 psi | 75% | 2507 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 42,714 psi | 67% | 2405 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 55,216 psi | 87% | 2369 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,478 psi | 89% | 2441 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 96% | 57,392 psi | 90% | 2497 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 57,508 psi | 90% | 2418 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,970 psi | 88% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,405 psi | 88% | 2352 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,276 psi | 90% | 2431 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,637 psi | 89% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,564 psi | 87% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,274 psi | 87% | 2352 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,913 psi | 89% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 54,940 psi | 86% | 2365 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,346 psi | 85% | 2395 fps | 98.8% |
| Somchem S365 | <<locked>> | 92% | 56,420 psi | 88% | 2448 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,273 psi | 85% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,028 psi | 88% | 2339 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,940 psi | 86% | 2395 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2454 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 56,797 psi | 89% | 2336 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,493 psi | 90% | 2448 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,492 psi | 87% | 2464 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,288 psi | 87% | 2539 fps | 99.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,908 psi | 80% | 2470 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 2415 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,143 psi | 85% | 2365 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,275 psi | 88% | 2467 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,620 psi | 82% | 2562 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,259 psi | 85% | 2428 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 53,505 psi | 84% | 2333 fps | 99.9% |
| Accurate 3100 | <<locked>> | 80% | 30,719 psi | 48% | 2037 fps | 97.8% |
| Accurate 4064 | <<locked>> | 80% | 53,708 psi | 84% | 2306 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,539 psi | 65% | 2241 fps | 100% |
| Accurate MAGPRO | 67 gr | 86% | 38,334 psi | 60% | 2274 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 49,995 psi | 78% | 2297 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,969 psi | 55% | 2142 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 35,447 psi | 56% | 2178 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 36,071 psi | 57% | 2192 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 28,442 psi | 45% | 2070 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,981 psi | 80% | 2316 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,157 psi | 85% | 2375 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,103 psi | 63% | 2247 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,745 psi | 72% | 2346 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,853 psi | 55% | 2139 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 30,850 psi | 48% | 2093 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,733 psi | 47% | 2067 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,020 psi | 41% | 1991 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,734 psi | 50% | 2178 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 48,573 psi | 76% | 2349 fps | 95.7% |
| Bofors RP15 | <<locked>> | 84% | 32,721 psi | 51% | 2136 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,590 psi | 81% | 2329 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 32,358 psi | 51% | 2162 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 30,850 psi | 48% | 2093 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 44,904 psi | 70% | 2241 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 90% | 34,664 psi | 54% | 2165 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 51,663 psi | 81% | 2349 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,410 psi | 68% | 2287 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,166 psi | 72% | 2293 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 37,782 psi | 59% | 2185 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 37,115 psi | 58% | 2169 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,724 psi | 59% | 2152 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 30,705 psi | 48% | 2149 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 42,148 psi | 66% | 2306 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1296 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,634 psi | 82% | 2320 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,524 psi | 64% | 2192 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,296 psi | 73% | 2264 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 39,697 psi | 62% | 2198 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 37,492 psi | 59% | 2142 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 36,318 psi | 57% | 2211 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,939 psi | 83% | 2313 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,019 psi | 69% | 2224 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 42,221 psi | 66% | 2218 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 26,556 psi | 42% | 1939 fps | 96.2% |
| Norma 203B | <<locked>> | 80% | 53,519 psi | 84% | 2362 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,045 psi | 63% | 2221 fps | 97.8% |
| Norma 217 | <<locked>> | 94% | 28,413 psi | 45% | 2103 fps | 95.2% |
| Norma MRP | 61.2 gr | 80% | 31,995 psi | 50% | 2149 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 41,104 psi | 64% | 2234 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 35,679 psi | 56% | 2211 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 39,740 psi | 62% | 2231 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 29,617 psi | 46% | 2067 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1325 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,474 psi | 81% | 2339 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,530 psi | 76% | 2375 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,249 psi | 65% | 2260 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,798 psi | 62% | 2277 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,515 psi | 46% | 2126 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 39,740 psi | 62% | 2349 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 48,617 psi | 76% | 2287 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,390 psi | 57% | 2126 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 34,084 psi | 53% | 2126 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,904 psi | 70% | 2241 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,019 psi | 69% | 2224 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 52,939 psi | 83% | 2313 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,221 psi | 66% | 2218 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,632 psi | 78% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,182 psi | 77% | 2182 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,004 psi | 67% | 2182 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,794 psi | 53% | 2123 fps | 96.4% |
| Somchem S355 | <<locked>> | 80% | 48,762 psi | 76% | 2287 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 36,898 psi | 58% | 2119 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,739 psi | 59% | 2198 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,722 psi | 54% | 2116 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 46,485 psi | 73% | 2221 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,409 psi | 66% | 2224 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 29,921 psi | 47% | 2011 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,388 psi | 84% | 2297 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,800 psi | 66% | 2231 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 33,170 psi | 52% | 2126 fps | 99.8% |
| Vihtavuori N560 | 64.2 gr | 84% | 36,970 psi | 58% | 2238 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 90% | 36,361 psi | 57% | 2228 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 98% | 41,336 psi | 65% | 2362 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,292 psi | 65% | 2198 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,410 psi | 68% | 2287 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,165 psi | 41% | 2080 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 31,560 psi | 49% | 2051 fps | 95.3% |
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 88 powders for .340 Weath. Mag. loaded with the .338 | 300gr | Lapua Scenar. Alliant Reloder-26 delivers the highest muzzle velocity at 2,572 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,572 fps. ADI AR 2217 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 54–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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 .340 Weath. Mag. with the .338 | 300gr | Lapua Scenar 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.