Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Rhino Solid Shank bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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 2495 | <<locked>> | 82% | 56,826 psi | 89% | 2562 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,667 psi | 90% | 2641 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 2694 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,101 psi | 89% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,288 psi | 85% | 2684 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,913 psi | 89% | 2838 fps | 99% |
| Accurate MAGPRO | <<locked>> | 98% | 54,070 psi | 85% | 2782 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 86% | 57,014 psi | 89% | 2651 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,143 psi | 86% | 2730 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2785 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,303 psi | 57% | 2474 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,550 psi | 89% | 2772 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,187 psi | 86% | 2726 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,187 psi | 86% | 2726 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,447 psi | 85% | 2625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,636 psi | 86% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,085 psi | 86% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,420 psi | 88% | 2756 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,462 psi | 85% | 2720 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2779 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2707 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2654 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,289 psi | 88% | 2844 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 2707 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 55,172 psi | 86% | 2641 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,365 psi | 65% | 2579 fps | 96.3% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2779 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 54,578 psi | 86% | 2638 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,150 psi | 71% | 2595 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,608 psi | 87% | 2661 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,434 psi | 88% | 2736 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 56,144 psi | 88% | 2694 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 56,579 psi | 89% | 2730 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,405 psi | 87% | 2713 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,521 psi | 87% | 2661 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,797 psi | 89% | 2687 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,643 psi | 70% | 2694 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 90% | 56,521 psi | 89% | 2772 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 57% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,435 psi | 90% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,434 psi | 88% | 2631 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,376 psi | 87% | 2621 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 55,492 psi | 87% | 2671 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,217 psi | 88% | 2661 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 54,650 psi | 86% | 2674 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,028 psi | 88% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,534 psi | 85% | 2664 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,838 psi | 84% | 2759 fps | 98.3% |
| Lovex S062 | <<locked>> | 84% | 56,797 psi | 89% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,217 psi | 88% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 57,624 psi | 90% | 2697 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2559 fps | 99.6% |
| Norma 203B | <<locked>> | 84% | 57,392 psi | 90% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,246 psi | 88% | 2723 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 54,940 psi | 86% | 2805 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 56,521 psi | 89% | 2717 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,578 psi | 86% | 2661 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,172 psi | 85% | 2776 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 55,201 psi | 87% | 2723 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,414 psi | 76% | 2661 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 58% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,361 psi | 87% | 2648 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,854 psi | 88% | 2743 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,186 psi | 85% | 2707 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,188 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,382 psi | 70% | 2687 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,201 psi | 87% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,477 psi | 87% | 2641 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,739 psi | 89% | 2700 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 57,363 psi | 90% | 2759 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 54,578 psi | 86% | 2638 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,217 psi | 88% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,797 psi | 89% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,624 psi | 90% | 2697 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,768 psi | 89% | 2694 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,653 psi | 90% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,304 psi | 88% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,956 psi | 88% | 2615 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,884 psi | 89% | 2756 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 55,288 psi | 87% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,781 psi | 86% | 2644 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 56,028 psi | 88% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,476 psi | 85% | 2687 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 55,666 psi | 87% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,840 psi | 88% | 2562 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,449 psi | 88% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,056 psi | 86% | 2661 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 2661 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 84% | 57,522 psi | 90% | 2608 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,667 psi | 90% | 2717 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,042 psi | 86% | 2730 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,172 psi | 86% | 2795 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,210 psi | 74% | 2661 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,476 psi | 85% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,652 psi | 89% | 2740 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2772 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,346 psi | 85% | 2677 fps | 99.1% |
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 2495 | <<locked>> | 80% | 53,258 psi | 83% | 2516 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,734 psi | 80% | 2543 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 28,500 psi | 45% | 2192 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 50,517 psi | 79% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,711 psi | 61% | 2431 fps | 99.5% |
| Accurate High Country | 73.6 gr | 88% | 40,364 psi | 63% | 2556 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 92% | 43,859 psi | 69% | 2612 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,413 psi | 74% | 2513 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,362 psi | 59% | 2415 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 92% | 43,236 psi | 68% | 2562 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 96% | 31,995 psi | 50% | 2362 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,721 psi | 83% | 2720 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 37,536 psi | 59% | 2418 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 37,536 psi | 59% | 2418 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,167 psi | 75% | 2536 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,300 psi | 80% | 2598 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,550 psi | 59% | 2438 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,569 psi | 67% | 2549 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,173 psi | 58% | 2411 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,304 psi | 58% | 2461 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,630 psi | 43% | 2224 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,312 psi | 46% | 2283 fps | 95.9% |
| Alliant Reloder-26 | 68.9 gr | 80% | 29,428 psi | 46% | 2333 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 36,869 psi | 58% | 2448 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 48,501 psi | 76% | 2546 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 38,740 psi | 61% | 2526 fps | 95.4% |
| Bofors RP5 | <<locked>> | 88% | 37,304 psi | 58% | 2461 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,540 psi | 67% | 2438 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 39,624 psi | 62% | 2484 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,762 psi | 76% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,625 psi | 64% | 2477 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 43,511 psi | 68% | 2490 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 43,352 psi | 68% | 2513 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,353 psi | 71% | 2552 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,186 psi | 55% | 2336 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,330 psi | 84% | 2641 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 36,796 psi | 58% | 2520 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 39,450 psi | 62% | 2490 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 43% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,925 psi | 85% | 2605 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,893 psi | 78% | 2539 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,040 psi | 82% | 2572 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,145 psi | 60% | 2372 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,888 psi | 69% | 2464 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 37,188 psi | 58% | 2388 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 52,605 psi | 82% | 2625 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,525 psi | 67% | 2464 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 41,249 psi | 65% | 2536 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 50,285 psi | 79% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,524 psi | 65% | 2418 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 39,755 psi | 62% | 2405 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 29,849 psi | 47% | 2228 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 50,633 psi | 79% | 2585 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,623 psi | 59% | 2402 fps | 95.4% |
| Norma MRP | 68.6 gr | 82% | 31,894 psi | 50% | 2359 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 38,421 psi | 60% | 2425 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 51,082 psi | 80% | 2612 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 40,959 psi | 64% | 2543 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,217 psi | 58% | 2415 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 33,852 psi | 53% | 2372 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1483 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,733 psi | 76% | 2549 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,223 psi | 71% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,479 psi | 60% | 2451 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,188 psi | 58% | 2461 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 33,678 psi | 53% | 2441 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 52,011 psi | 82% | 2543 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,701 psi | 72% | 2500 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,379 psi | 65% | 2448 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 36,245 psi | 57% | 2395 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 42,540 psi | 67% | 2438 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,524 psi | 65% | 2418 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 50,285 psi | 79% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,755 psi | 62% | 2405 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,789 psi | 73% | 2552 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,215 psi | 85% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,804 psi | 73% | 2398 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,538 psi | 64% | 2369 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 35,911 psi | 56% | 2392 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 45,905 psi | 72% | 2497 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,034 psi | 71% | 2490 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 34,853 psi | 55% | 2385 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,548 psi | 54% | 2329 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 52,359 psi | 82% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,431 psi | 82% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,830 psi | 69% | 2431 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,798 psi | 62% | 2421 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 33,953 psi | 53% | 2313 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 50,676 psi | 79% | 2520 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,262 psi | 62% | 2425 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 30,530 psi | 48% | 2290 fps | 98.3% |
| Vihtavuori N560 | <<locked>> | 90% | 42,148 psi | 66% | 2569 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 96% | 41,205 psi | 65% | 2549 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,827 psi | 61% | 2392 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,625 psi | 64% | 2477 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,424 psi | 38% | 2215 fps | 97.8% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,085 psi | 57% | 2365 fps | 95.1% |
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 97 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,844 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 250.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | Rhino Solid Shank 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.