Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 275gr | Swift A-Frame 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% | 56,898 psi | 89% | 2507 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 55,898 psi | 88% | 2566 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,884 psi | 89% | 2477 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,462 psi | 85% | 2556 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,201 psi | 85% | 2661 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 84% | 56,492 psi | 89% | 2516 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,027 psi | 86% | 2605 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 56,260 psi | 88% | 2661 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 2464 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2431 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,493 psi | 90% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,609 psi | 90% | 2552 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,172 psi | 86% | 2602 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,333 psi | 88% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,520 psi | 85% | 2595 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,709 psi | 87% | 2657 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 2621 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,834 psi | 77% | 2585 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,753 psi | 89% | 2713 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,911 psi | 86% | 2575 fps | 96.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 2641 fps | 99.7% |
| Bofors RP3 | <<locked>> | 82% | 54,839 psi | 86% | 2503 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2526 fps | 98.2% |
| Bofors RP5 | <<locked>> | 98% | 55,709 psi | 87% | 2657 fps | 99.8% |
| Bofors RP7 | <<locked>> | 88% | 57,551 psi | 90% | 2552 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,269 psi | 76% | 2539 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,998 psi | 86% | 2526 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,289 psi | 88% | 2605 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,651 psi | 87% | 2562 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 96% | 56,420 psi | 88% | 2605 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,245 psi | 87% | 2589 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,593 psi | 87% | 2530 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,950 psi | 75% | 2641 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 56,420 psi | 88% | 2641 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,927 psi | 58% | 1545 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,825 psi | 87% | 2493 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,317 psi | 87% | 2543 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,651 psi | 87% | 2530 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 54,781 psi | 86% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,273 psi | 85% | 2543 fps | 98.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,624 psi | 90% | 2690 fps | 99.5% |
| Lovex S062 | <<locked>> | 82% | 56,333 psi | 88% | 2487 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,072 psi | 88% | 2526 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,450 psi | 90% | 2569 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2490 fps | 100% |
| Norma 203B | <<locked>> | 82% | 56,884 psi | 89% | 2539 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,130 psi | 88% | 2595 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 34,345 psi | 54% | 2362 fps | 97.2% |
| Norma MRP | <<locked>> | 96% | 55,477 psi | 87% | 2677 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,550 psi | 89% | 2585 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,201 psi | 85% | 2654 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 55,332 psi | 87% | 2595 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2598 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,752 psi | 86% | 2516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,970 psi | 88% | 2605 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,172 psi | 85% | 2579 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,217 psi | 88% | 2654 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2635 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 42,859 psi | 67% | 2526 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 84% | 55,187 psi | 86% | 2503 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,449 psi | 88% | 2575 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 57,479 psi | 90% | 2631 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 57,551 psi | 90% | 2552 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,072 psi | 88% | 2526 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,333 psi | 88% | 2487 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,450 psi | 90% | 2569 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,623 psi | 89% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,535 psi | 87% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,317 psi | 87% | 2484 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,014 psi | 89% | 2628 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 55,027 psi | 86% | 2500 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,404 psi | 85% | 2523 fps | 98.4% |
| Somchem S365 | <<locked>> | 92% | 56,275 psi | 88% | 2582 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,447 psi | 85% | 2562 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 56,246 psi | 88% | 2474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,969 psi | 86% | 2530 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2585 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 82% | 56,724 psi | 89% | 2467 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,566 psi | 90% | 2585 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,521 psi | 87% | 2602 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,521 psi | 87% | 2674 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2602 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 44,454 psi | 70% | 2539 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,070 psi | 85% | 2497 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,521 psi | 89% | 2608 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,750 psi | 83% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,244 psi | 85% | 2556 fps | 99.6% |
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% | 53,403 psi | 84% | 2461 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 30,806 psi | 48% | 2146 fps | 97.2% |
| Accurate 4064 | <<locked>> | 80% | 53,548 psi | 84% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,640 psi | 65% | 2365 fps | 100% |
| Accurate MAGPRO | 73.7 gr | 88% | 41,031 psi | 64% | 2441 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,951 psi | 78% | 2428 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,925 psi | 55% | 2254 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 37,855 psi | 59% | 2346 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 96% | 38,493 psi | 60% | 2356 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 92% | 30,269 psi | 47% | 2221 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,807 psi | 80% | 2448 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,259 psi | 85% | 2510 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,030 psi | 63% | 2369 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,614 psi | 71% | 2470 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,911 psi | 55% | 2254 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 32,793 psi | 51% | 2251 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,646 psi | 46% | 2175 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,005 psi | 41% | 2090 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,807 psi | 50% | 2290 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 48,675 psi | 76% | 2474 fps | 95.1% |
| Bofors RP15 | <<locked>> | 84% | 32,692 psi | 51% | 2244 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 51,372 psi | 81% | 2461 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 34,418 psi | 54% | 2323 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 32,793 psi | 51% | 2251 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 44,962 psi | 70% | 2365 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 92% | 36,999 psi | 58% | 2326 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,547 psi | 81% | 2477 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,265 psi | 68% | 2408 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 45,977 psi | 72% | 2418 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 40,480 psi | 63% | 2352 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 39,653 psi | 62% | 2336 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,710 psi | 59% | 2270 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,576 psi | 51% | 2310 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 42,163 psi | 66% | 2428 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 43% | 1378 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,591 psi | 82% | 2451 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,466 psi | 63% | 2310 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,296 psi | 73% | 2388 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 39,668 psi | 62% | 2316 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 39,900 psi | 63% | 2303 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 38,798 psi | 61% | 2379 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 52,866 psi | 83% | 2444 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,903 psi | 69% | 2346 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 42,177 psi | 66% | 2339 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 26,542 psi | 42% | 2041 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 53,621 psi | 84% | 2497 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,045 psi | 63% | 2339 fps | 97.3% |
| Norma 217 | <<locked>> | 96% | 30,269 psi | 47% | 2257 fps | 95.3% |
| Norma MRP | 65.8 gr | 80% | 31,952 psi | 50% | 2257 fps | 96.5% |
| Norma URP | <<locked>> | 80% | 41,060 psi | 64% | 2356 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 35,636 psi | 56% | 2323 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,740 psi | 62% | 2352 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 31,633 psi | 50% | 2221 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 44% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,430 psi | 81% | 2467 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,428 psi | 76% | 2507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,321 psi | 65% | 2385 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,726 psi | 62% | 2398 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,515 psi | 46% | 2231 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 39,914 psi | 63% | 2467 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 48,602 psi | 76% | 2418 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,390 psi | 57% | 2238 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 34,055 psi | 53% | 2238 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 44,962 psi | 70% | 2365 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,903 psi | 69% | 2346 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 52,866 psi | 83% | 2444 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,177 psi | 66% | 2339 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,632 psi | 78% | 2467 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,182 psi | 77% | 2306 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,902 psi | 67% | 2300 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,750 psi | 53% | 2234 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 48,631 psi | 76% | 2411 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 39,363 psi | 62% | 2277 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,666 psi | 59% | 2316 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,563 psi | 54% | 2224 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 46,499 psi | 73% | 2349 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,496 psi | 67% | 2349 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 31,894 psi | 50% | 2162 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 53,330 psi | 84% | 2428 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,742 psi | 65% | 2352 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,069 psi | 52% | 2238 fps | 99.5% |
| Vihtavuori N560 | 70.7 gr | 86% | 39,523 psi | 62% | 2405 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 39,001 psi | 61% | 2395 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 41,466 psi | 65% | 2480 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,350 psi | 65% | 2320 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,468 psi | 68% | 2411 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,165 psi | 41% | 2182 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,663 psi | 53% | 2205 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 88 powders for .340 Weath. Mag. loaded with the .338 | 275gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,713 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 275.0 gr projectile in 0.338" calls for a 1:14.5 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 | 275gr | Swift A-Frame 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.