Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 300gr | Hornady HPBT 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.
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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% | 57,305 psi | 90% | 2385 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 56,376 psi | 88% | 2444 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,464 psi | 90% | 2352 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,752 psi | 86% | 2425 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,679 psi | 86% | 2539 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 84% | 56,927 psi | 89% | 2388 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,419 psi | 87% | 2480 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 98% | 56,550 psi | 89% | 2533 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,222 psi | 69% | 2349 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,102 psi | 61% | 2323 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,651 psi | 87% | 2480 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,491 psi | 85% | 2362 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,680 psi | 87% | 2470 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,869 psi | 89% | 2487 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,955 psi | 86% | 2474 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,057 psi | 88% | 2530 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 2493 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,197 psi | 77% | 2464 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,406 psi | 90% | 2585 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,361 psi | 87% | 2457 fps | 97.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 2516 fps | 99.9% |
| Bofors RP3 | <<locked>> | 82% | 55,448 psi | 87% | 2379 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,121 psi | 71% | 2415 fps | 98.8% |
| Bofors RP5 | <<locked>> | 98% | 56,057 psi | 88% | 2530 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 54,534 psi | 85% | 2385 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,515 psi | 76% | 2421 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 82% | 55,434 psi | 87% | 2398 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,594 psi | 89% | 2477 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,260 psi | 88% | 2441 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 56,811 psi | 89% | 2480 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,593 psi | 87% | 2467 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,956 psi | 88% | 2402 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2520 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 56,840 psi | 89% | 2516 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 1457 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,275 psi | 88% | 2369 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,709 psi | 87% | 2418 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,985 psi | 88% | 2402 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 55,201 psi | 87% | 2418 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,621 psi | 86% | 2421 fps | 99% |
| IMR 7828 SSC | <<locked>> | 98% | 54,346 psi | 85% | 2516 fps | 99.5% |
| Lovex S062 | <<locked>> | 82% | 56,797 psi | 89% | 2359 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,260 psi | 88% | 2398 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,302 psi | 85% | 2398 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2369 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,406 psi | 90% | 2411 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,434 psi | 88% | 2470 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 34,693 psi | 54% | 2264 fps | 98.1% |
| Norma MRP | <<locked>> | 96% | 55,753 psi | 87% | 2549 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,956 psi | 89% | 2457 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,839 psi | 86% | 2533 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 90% | 55,651 psi | 87% | 2467 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2474 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,114 psi | 86% | 2388 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,275 psi | 88% | 2474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,737 psi | 86% | 2451 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,695 psi | 89% | 2526 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,095 psi | 75% | 2516 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 43,236 psi | 68% | 2418 fps | 97% |
| Rottweil R 903 | <<locked>> | 84% | 55,564 psi | 87% | 2375 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,985 psi | 89% | 2451 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 94% | 54,433 psi | 85% | 2464 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 54,534 psi | 85% | 2385 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,260 psi | 88% | 2398 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,797 psi | 89% | 2359 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,302 psi | 85% | 2398 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,956 psi | 89% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,927 psi | 88% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,796 psi | 87% | 2362 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,450 psi | 90% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 55,317 psi | 87% | 2372 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,766 psi | 86% | 2402 fps | 98.9% |
| Somchem S365 | <<locked>> | 92% | 56,782 psi | 89% | 2454 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,766 psi | 86% | 2434 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,623 psi | 89% | 2346 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,245 psi | 87% | 2402 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2461 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 57,159 psi | 90% | 2343 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,549 psi | 85% | 2415 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,043 psi | 88% | 2474 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,782 psi | 87% | 2549 fps | 99.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,387 psi | 81% | 2480 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 44,672 psi | 70% | 2425 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,592 psi | 86% | 2372 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,826 psi | 89% | 2477 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2569 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,737 psi | 86% | 2434 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% | 53,780 psi | 84% | 2339 fps | 99.9% |
| Accurate 3100 | <<locked>> | 80% | 31,067 psi | 49% | 2047 fps | 98% |
| Accurate 4064 | <<locked>> | 80% | 53,940 psi | 85% | 2310 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,916 psi | 66% | 2247 fps | 100% |
| Accurate MAGPRO | 67.6 gr | 86% | 38,754 psi | 61% | 2283 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,372 psi | 79% | 2306 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,259 psi | 55% | 2152 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 35,853 psi | 56% | 2192 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 94% | 36,434 psi | 57% | 2201 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 28,747 psi | 45% | 2080 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,462 psi | 56% | 2152 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,343 psi | 80% | 2323 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,466 psi | 63% | 2257 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,122 psi | 72% | 2352 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,143 psi | 55% | 2149 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 31,111 psi | 49% | 2103 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,892 psi | 47% | 2073 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,252 psi | 41% | 2001 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,155 psi | 50% | 2188 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 46,137 psi | 72% | 2316 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 31,024 psi | 49% | 2100 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 51,967 psi | 81% | 2336 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 32,590 psi | 51% | 2172 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 31,111 psi | 49% | 2103 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 45,252 psi | 71% | 2251 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 32,808 psi | 51% | 2126 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 51,996 psi | 81% | 2356 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,729 psi | 69% | 2293 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,499 psi | 73% | 2303 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 38,203 psi | 60% | 2195 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 37,565 psi | 59% | 2182 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,101 psi | 60% | 2159 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 30,908 psi | 48% | 2162 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 42,641 psi | 67% | 2316 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 1296 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,011 psi | 83% | 2329 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,828 psi | 64% | 2198 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,601 psi | 73% | 2274 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 40,045 psi | 63% | 2205 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 37,753 psi | 59% | 2149 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 36,550 psi | 57% | 2218 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,316 psi | 84% | 2320 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,164 psi | 69% | 2231 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 42,554 psi | 67% | 2224 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 26,847 psi | 42% | 1949 fps | 96.4% |
| Norma 203B | <<locked>> | 80% | 53,896 psi | 84% | 2369 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,538 psi | 64% | 2234 fps | 98% |
| Norma 217 | <<locked>> | 94% | 28,732 psi | 45% | 2116 fps | 95.5% |
| Norma MRP | 61.7 gr | 80% | 32,271 psi | 51% | 2159 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 41,452 psi | 65% | 2241 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 33,605 psi | 53% | 2169 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 40,205 psi | 63% | 2241 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 29,834 psi | 47% | 2073 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 44% | 1329 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,779 psi | 81% | 2346 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,950 psi | 77% | 2385 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,785 psi | 65% | 2270 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,103 psi | 63% | 2287 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 27,905 psi | 44% | 2087 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 37,536 psi | 59% | 2310 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 48,994 psi | 77% | 2297 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,695 psi | 57% | 2133 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 34,432 psi | 54% | 2136 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,252 psi | 71% | 2251 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,164 psi | 69% | 2231 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 53,316 psi | 84% | 2320 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,554 psi | 67% | 2224 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,198 psi | 79% | 2346 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,603 psi | 78% | 2188 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,308 psi | 68% | 2188 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,113 psi | 53% | 2133 fps | 96.6% |
| Somchem S355 | <<locked>> | 80% | 48,907 psi | 77% | 2290 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 37,130 psi | 58% | 2126 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,116 psi | 60% | 2205 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,027 psi | 55% | 2123 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 46,847 psi | 73% | 2228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,757 psi | 67% | 2234 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 30,182 psi | 47% | 2018 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 53,722 psi | 84% | 2303 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,148 psi | 66% | 2241 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 33,533 psi | 53% | 2136 fps | 99.8% |
| Vihtavuori N560 | 64.8 gr | 84% | 37,391 psi | 59% | 2247 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 34,432 psi | 54% | 2188 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 39,088 psi | 61% | 2320 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,582 psi | 65% | 2205 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,729 psi | 69% | 2293 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,498 psi | 42% | 2093 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 31,807 psi | 50% | 2060 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 .340 Weath. Mag. loaded with the .338 | 300gr | Hornady HPBT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,585 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,585 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 1:12.0 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 | Hornady HPBT 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.