Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 300gr | Nosler Custom Competition bullet and 90 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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 56,797 psi | 89% | 2372 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 55,608 psi | 87% | 2431 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,768 psi | 89% | 2339 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,128 psi | 85% | 2415 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,027 psi | 85% | 2526 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 84% | 56,333 psi | 88% | 2375 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,752 psi | 86% | 2467 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 55,941 psi | 88% | 2520 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,685 psi | 68% | 2336 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,624 psi | 61% | 2310 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,984 psi | 86% | 2464 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,464 psi | 90% | 2395 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,493 psi | 90% | 2415 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,056 psi | 86% | 2461 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,072 psi | 88% | 2474 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,273 psi | 85% | 2457 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,390 psi | 87% | 2516 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 2480 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,588 psi | 76% | 2451 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,420 psi | 88% | 2569 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,679 psi | 86% | 2441 fps | 97% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 2503 fps | 99.9% |
| Bofors RP3 | <<locked>> | 82% | 54,853 psi | 86% | 2369 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,512 psi | 70% | 2398 fps | 98.6% |
| Bofors RP5 | <<locked>> | 98% | 55,390 psi | 87% | 2516 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 57,319 psi | 90% | 2411 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 2408 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 82% | 54,853 psi | 86% | 2388 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,101 psi | 88% | 2464 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,492 psi | 87% | 2425 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 96% | 56,173 psi | 88% | 2467 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,940 psi | 86% | 2454 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,405 psi | 87% | 2392 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,659 psi | 75% | 2507 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 56,130 psi | 88% | 2503 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 58% | 1450 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,898 psi | 88% | 2359 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,042 psi | 86% | 2405 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,477 psi | 87% | 2392 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 54,650 psi | 86% | 2408 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,522 psi | 90% | 2451 fps | 99.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2549 fps | 99.7% |
| Lovex S062 | <<locked>> | 82% | 56,159 psi | 88% | 2349 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,753 psi | 87% | 2385 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,319 psi | 90% | 2431 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,690 psi | 78% | 2359 fps | 100% |
| Norma 203B | <<locked>> | 82% | 56,782 psi | 89% | 2402 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,724 psi | 87% | 2454 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 34,214 psi | 54% | 2247 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 54,998 psi | 86% | 2536 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,391 psi | 88% | 2444 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,638 psi | 90% | 2428 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 53,954 psi | 85% | 2516 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 54,926 psi | 86% | 2454 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2461 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 59% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,592 psi | 86% | 2379 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,651 psi | 87% | 2461 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,595 psi | 90% | 2480 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,956 psi | 88% | 2513 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,616 psi | 75% | 2503 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 42,569 psi | 67% | 2402 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 84% | 54,969 psi | 86% | 2365 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,304 psi | 88% | 2438 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 96% | 57,174 psi | 90% | 2493 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 57,319 psi | 90% | 2411 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,753 psi | 87% | 2385 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,159 psi | 88% | 2349 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,319 psi | 90% | 2431 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,420 psi | 88% | 2418 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,608 psi | 87% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,288 psi | 87% | 2352 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,695 psi | 89% | 2487 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 54,940 psi | 86% | 2362 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,186 psi | 85% | 2392 fps | 98.8% |
| Somchem S365 | <<locked>> | 92% | 56,159 psi | 88% | 2441 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,682 psi | 90% | 2467 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,043 psi | 88% | 2336 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,723 psi | 86% | 2392 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 2451 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 56,608 psi | 89% | 2333 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,305 psi | 90% | 2444 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,259 psi | 87% | 2461 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,129 psi | 86% | 2536 fps | 99.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 2467 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 44,208 psi | 69% | 2411 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,940 psi | 85% | 2362 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,289 psi | 88% | 2467 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,388 psi | 82% | 2559 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,070 psi | 85% | 2421 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% | 53,287 psi | 84% | 2326 fps | 99.9% |
| Accurate 3100 | <<locked>> | 80% | 30,719 psi | 48% | 2037 fps | 97.8% |
| Accurate 4064 | <<locked>> | 80% | 53,490 psi | 84% | 2303 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,524 psi | 65% | 2238 fps | 100% |
| Accurate MAGPRO | 66.8 gr | 86% | 38,159 psi | 60% | 2267 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 49,995 psi | 78% | 2297 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,983 psi | 55% | 2139 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 35,462 psi | 56% | 2178 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 36,114 psi | 57% | 2192 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 28,355 psi | 44% | 2064 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,143 psi | 55% | 2142 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,763 psi | 80% | 2313 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,143 psi | 85% | 2372 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,929 psi | 63% | 2244 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,527 psi | 71% | 2339 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,838 psi | 55% | 2139 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 30,690 psi | 48% | 2090 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,573 psi | 46% | 2064 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,020 psi | 41% | 1991 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,720 psi | 50% | 2175 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 48,443 psi | 76% | 2346 fps | 95.6% |
| Bofors RP15 | <<locked>> | 84% | 32,547 psi | 51% | 2133 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 51,343 psi | 80% | 2326 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 34,258 psi | 54% | 2205 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 30,690 psi | 48% | 2090 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,918 psi | 70% | 2241 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 90% | 34,534 psi | 54% | 2159 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 51,430 psi | 81% | 2343 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,192 psi | 68% | 2280 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 45,977 psi | 72% | 2290 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 37,797 psi | 59% | 2182 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 37,144 psi | 58% | 2169 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,695 psi | 59% | 2149 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 30,574 psi | 48% | 2146 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,959 psi | 66% | 2300 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1293 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,620 psi | 82% | 2316 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,509 psi | 63% | 2188 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,282 psi | 73% | 2260 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 39,682 psi | 62% | 2195 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 37,347 psi | 59% | 2136 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 36,158 psi | 57% | 2205 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,910 psi | 83% | 2310 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,845 psi | 69% | 2221 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 42,003 psi | 66% | 2215 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 26,542 psi | 42% | 1939 fps | 96.2% |
| Norma 203B | <<locked>> | 80% | 53,490 psi | 84% | 2362 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,045 psi | 63% | 2218 fps | 97.8% |
| Norma 217 | <<locked>> | 94% | 28,427 psi | 45% | 2103 fps | 95.2% |
| Norma MRP | 61 gr | 80% | 31,836 psi | 50% | 2142 fps | 97.1% |
| Norma URP | <<locked>> | 80% | 40,872 psi | 64% | 2228 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 54,056 psi | 85% | 2385 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 35,520 psi | 56% | 2208 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 39,726 psi | 62% | 2231 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 29,486 psi | 46% | 2060 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 44% | 1325 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,271 psi | 80% | 2333 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,327 psi | 76% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,234 psi | 65% | 2260 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,595 psi | 62% | 2274 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,414 psi | 46% | 2123 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 39,624 psi | 62% | 2346 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 48,399 psi | 76% | 2283 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,245 psi | 57% | 2119 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 33,939 psi | 53% | 2123 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,918 psi | 70% | 2241 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,845 psi | 69% | 2221 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 52,910 psi | 83% | 2310 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,003 psi | 66% | 2215 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,617 psi | 78% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,197 psi | 77% | 2178 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,844 psi | 67% | 2178 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,620 psi | 53% | 2119 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 48,515 psi | 76% | 2280 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 39,146 psi | 61% | 2159 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 37,710 psi | 59% | 2195 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,548 psi | 54% | 2110 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 46,282 psi | 73% | 2218 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,409 psi | 66% | 2224 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 29,907 psi | 47% | 2008 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 53,171 psi | 83% | 2293 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,611 psi | 65% | 2228 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 32,996 psi | 52% | 2123 fps | 99.8% |
| Vihtavuori N560 | 64.1 gr | 84% | 36,970 psi | 58% | 2238 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 90% | 36,347 psi | 57% | 2224 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 98% | 41,191 psi | 65% | 2356 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,104 psi | 64% | 2192 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,395 psi | 68% | 2283 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,136 psi | 41% | 2080 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 31,415 psi | 49% | 2047 fps | 95.2% |
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 90 powders for .340 Weath. Mag. loaded with the .338 | 300gr | Nosler Custom Competition. Alliant Reloder-26 delivers the highest muzzle velocity at 2,569 fps; across all powders the maximum-charge window runs from 1,450 fps to 2,569 fps. ADI AR 2217 gives the best case fill at 100 %, and 90 of the 90 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 1:12.0 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 | Nosler Custom Competition 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.