Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 250gr | Swift A-Frame bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Hodgdon Superformance.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 52,765 psi | 87% | 2477 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,056 psi | 89% | 2546 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,691 psi | 83% | 2585 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 53,258 psi | 87% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,214 psi | 87% | 2631 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 52,562 psi | 86% | 2717 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 86% | 53,388 psi | 88% | 2559 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,418 psi | 89% | 2674 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,880 psi | 85% | 2664 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,185 psi | 86% | 2674 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,114 psi | 89% | 2582 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,230 psi | 89% | 2602 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,128 psi | 89% | 2680 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 51,474 psi | 85% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,374 psi | 88% | 2661 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,444 psi | 83% | 2664 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,616 psi | 78% | 2602 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,611 psi | 68% | 2536 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,476 psi | 89% | 2785 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,296 psi | 76% | 2595 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 54,737 psi | 90% | 2595 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,444 psi | 83% | 2664 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 54,215 psi | 89% | 2585 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 84% | 51,793 psi | 85% | 2566 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 52,083 psi | 86% | 2631 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 52,286 psi | 86% | 2592 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 52,040 psi | 85% | 2615 fps | 96.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,433 psi | 89% | 2651 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,433 psi | 89% | 2608 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,692 psi | 87% | 2595 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 40,756 psi | 67% | 2562 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 90% | 51,822 psi | 85% | 2664 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 60% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,780 psi | 88% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 52,953 psi | 87% | 2543 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 52,127 psi | 86% | 2526 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 54,868 psi | 90% | 2618 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 52,634 psi | 86% | 2566 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 53,621 psi | 88% | 2621 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 52,243 psi | 86% | 2579 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,056 psi | 89% | 2608 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,298 psi | 81% | 2638 fps | 96.8% |
| Lovex S060 | <<locked>> | 82% | 54,679 psi | 90% | 2530 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,026 psi | 87% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 52,591 psi | 86% | 2559 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 53,664 psi | 88% | 2602 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,235 psi | 69% | 2454 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 54,418 psi | 89% | 2546 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,984 psi | 90% | 2539 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,519 psi | 88% | 2589 fps | 100% |
| Norma 204 | <<locked>> | 92% | 51,880 psi | 85% | 2615 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 53,403 psi | 88% | 2740 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 52,243 psi | 86% | 2618 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,215 psi | 89% | 2618 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,458 psi | 81% | 2651 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 54,404 psi | 89% | 2671 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,918 psi | 72% | 2539 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 61% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,027 psi | 90% | 2598 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,085 psi | 90% | 2664 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,766 psi | 90% | 2694 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,040 psi | 87% | 2654 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 51,488 psi | 85% | 2677 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,350 psi | 66% | 2552 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 51,982 psi | 85% | 2507 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,882 psi | 90% | 2595 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 52,750 psi | 87% | 2595 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 52,649 psi | 86% | 2648 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 54,215 psi | 89% | 2585 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 52,591 psi | 86% | 2559 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 53,026 psi | 87% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,664 psi | 88% | 2602 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 52,852 psi | 87% | 2605 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,056 psi | 89% | 2575 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 52,707 psi | 87% | 2441 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 52,243 psi | 86% | 2516 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,170 psi | 86% | 2644 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 54,969 psi | 90% | 2477 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,926 psi | 90% | 2589 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,259 psi | 89% | 2589 fps | 96.9% |
| Somchem S365 | <<locked>> | 96% | 54,563 psi | 90% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,272 psi | 87% | 2625 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 51,982 psi | 85% | 2464 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 52,344 psi | 86% | 2480 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 52,736 psi | 87% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,288 psi | 89% | 2612 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,052 psi | 81% | 2552 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 53,853 psi | 88% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,374 psi | 88% | 2618 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,417 psi | 88% | 2674 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,896 psi | 88% | 2730 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,838 psi | 88% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,083 psi | 86% | 2631 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,859 psi | 70% | 2657 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,041 psi | 89% | 2582 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,316 psi | 88% | 2621 fps | 98.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,603 psi | 81% | 2438 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,456 psi | 78% | 2444 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 29,602 psi | 49% | 2192 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 46,963 psi | 77% | 2444 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,520 psi | 58% | 2333 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 98% | 48,950 psi | 80% | 2661 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 44,440 psi | 73% | 2425 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 39,421 psi | 65% | 2415 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 45,455 psi | 75% | 2556 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,617 psi | 80% | 2618 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,802 psi | 74% | 2448 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,950 psi | 79% | 2510 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,838 psi | 57% | 2339 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,102 psi | 64% | 2451 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 39,073 psi | 64% | 2411 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 38,972 psi | 64% | 2457 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,498 psi | 42% | 2126 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 30,618 psi | 50% | 2280 fps | 95.7% |
| Alliant Reloder-26 | 65.1 gr | 82% | 28,805 psi | 47% | 2277 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 38,305 psi | 63% | 2441 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 44,933 psi | 74% | 2457 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 38,972 psi | 64% | 2457 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,871 psi | 65% | 2346 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 80% | 45,310 psi | 74% | 2467 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 37,420 psi | 61% | 2375 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 40,480 psi | 66% | 2392 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 45,600 psi | 75% | 2510 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 47,659 psi | 78% | 2546 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,300 psi | 53% | 2244 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,414 psi | 81% | 2549 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 38,218 psi | 63% | 2503 fps | 95.6% |
| Hodgdon Superformance | 65.5 gr | 80% | 36,376 psi | 60% | 2382 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 45% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,662 psi | 83% | 2516 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,746 psi | 77% | 2451 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,950 psi | 80% | 2480 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 35,447 psi | 58% | 2280 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,292 psi | 68% | 2375 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 34,229 psi | 56% | 2290 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 49,182 psi | 81% | 2533 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 44,715 psi | 73% | 2457 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 43,395 psi | 71% | 2530 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 51,532 psi | 85% | 2484 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,065 psi | 77% | 2451 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,798 psi | 64% | 2329 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 36,941 psi | 61% | 2310 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 30,705 psi | 50% | 2218 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 51,256 psi | 84% | 2503 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,808 psi | 85% | 2500 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,326 psi | 78% | 2497 fps | 100% |
| Norma 204 | <<locked>> | 84% | 39,711 psi | 65% | 2405 fps | 95.4% |
| Norma MRP | <<locked>> | 86% | 33,272 psi | 55% | 2359 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,360 psi | 58% | 2326 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 47,282 psi | 78% | 2516 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 42,946 psi | 71% | 2533 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 34,316 psi | 56% | 2316 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 96% | 38,130 psi | 63% | 2425 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 45% | 1444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,397 psi | 75% | 2451 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,561 psi | 85% | 2615 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,568 psi | 68% | 2500 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,085 psi | 58% | 2349 fps | 98.3% |
| ReloadSwiss RS 70 | 62.9 gr | 80% | 34,301 psi | 56% | 2352 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 35,346 psi | 58% | 2434 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,704 psi | 80% | 2457 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,308 psi | 69% | 2408 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 43,584 psi | 72% | 2444 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 37,971 psi | 62% | 2395 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,871 psi | 65% | 2346 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,798 psi | 64% | 2329 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 47,065 psi | 77% | 2451 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,941 psi | 61% | 2310 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,366 psi | 71% | 2461 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,749 psi | 83% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,859 psi | 72% | 2320 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,913 psi | 62% | 2277 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 37,608 psi | 62% | 2388 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,866 psi | 85% | 2438 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,830 psi | 70% | 2411 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 47,485 psi | 78% | 2487 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 31,850 psi | 52% | 2290 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 36,187 psi | 59% | 2329 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 48,849 psi | 80% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,066 psi | 81% | 2438 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,785 psi | 67% | 2346 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,840 psi | 60% | 2326 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 92% | 37,855 psi | 62% | 2356 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,282 psi | 78% | 2434 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,143 psi | 59% | 2326 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,746 psi | 46% | 2195 fps | 96.8% |
| Vihtavuori N560 | <<locked>> | 94% | 44,150 psi | 72% | 2566 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,042 psi | 59% | 2303 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 37,594 psi | 62% | 2379 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 22,481 psi | 37% | 2096 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,705 psi | 83% | 2536 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 38,014 psi | 62% | 2365 fps | 95% |
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 96 powders for .338 Blaser Mag. loaded with the .338 | 250gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 2,785 fps; across all powders the maximum-charge window runs from 1,581 fps to 2,785 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .338 Blaser Mag. with the .338 | 250gr | 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.