Load Specifications
Load data in caliber .338-06 A-Square with .338 | 225gr | Speer Grand Slam 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 Power Pro 2000-MR, Hodgdon CFE223 and Ramshot Big Game.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 55,753 psi | 88% | 2467 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,898 psi | 89% | 2556 fps | 99.3% |
| Accurate 2230 | <<locked>> | 82% | 57,029 psi | 90% | 2569 fps | 99.5% |
| Accurate 2460 | <<locked>> | 86% | 54,331 psi | 86% | 2493 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,391 psi | 89% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,535 psi | 88% | 2546 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,883 psi | 89% | 2562 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,483 psi | 71% | 2470 fps | 97.3% |
| Accurate LT-30 | <<locked>> | 84% | 55,738 psi | 88% | 2418 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,202 psi | 89% | 2441 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,578 psi | 87% | 2549 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 55,535 psi | 88% | 2546 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 56,362 psi | 89% | 2533 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,041 psi | 86% | 2513 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 57,087 psi | 90% | 2533 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,738 psi | 88% | 2608 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,969 psi | 86% | 2651 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,621 psi | 87% | 2566 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,637 psi | 88% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,651 psi | 88% | 2585 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,730 psi | 71% | 2477 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,430 psi | 82% | 2615 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,650 psi | 87% | 2421 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,128 psi | 86% | 2562 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 54,998 psi | 87% | 2579 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,188 psi | 89% | 2497 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,260 psi | 89% | 2585 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,244 psi | 86% | 2621 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,810 psi | 87% | 2513 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,985 psi | 89% | 2539 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,739 psi | 90% | 2589 fps | 98.8% |
| Hodgdon H4895 | <<locked>> | 92% | 55,056 psi | 87% | 2559 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,017 psi | 65% | 2379 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,592 psi | 85% | 2589 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 55% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,695 psi | 90% | 2566 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 54,317 psi | 86% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,085 psi | 87% | 2530 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,130 psi | 89% | 2513 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 56,217 psi | 89% | 2434 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,621 psi | 87% | 2523 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,554 psi | 67% | 2421 fps | 96.9% |
| IMR 4895 | <<locked>> | 96% | 57,087 psi | 90% | 2615 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 54,041 psi | 86% | 2513 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 54,215 psi | 86% | 2503 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,577 psi | 85% | 2533 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,955 psi | 87% | 2487 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 54,331 psi | 86% | 2530 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2474 fps | 97% |
| Norma 200 | <<locked>> | 82% | 55,579 psi | 88% | 2448 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,768 psi | 90% | 2546 fps | 100% |
| Norma 202 | <<locked>> | 92% | 53,751 psi | 85% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,737 psi | 87% | 2575 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 44,759 psi | 71% | 2470 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 55,114 psi | 87% | 2598 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,708 psi | 87% | 2526 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,650 psi | 85% | 2546 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,405 psi | 88% | 2516 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,853 psi | 55% | 1532 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,853 psi | 85% | 2500 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,737 psi | 85% | 2523 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,579 psi | 88% | 2644 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,926 psi | 87% | 2674 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,425 psi | 70% | 2490 fps | 96.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,861 psi | 73% | 2507 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 90% | 54,665 psi | 87% | 2490 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,942 psi | 90% | 2539 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,534 psi | 86% | 2566 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2474 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,577 psi | 85% | 2533 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,331 psi | 86% | 2530 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,679 psi | 85% | 2474 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,347 psi | 89% | 2192 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,710 psi | 90% | 2543 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,449 psi | 89% | 2625 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,623 psi | 90% | 2490 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,260 psi | 89% | 2552 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,565 psi | 90% | 2572 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,695 psi | 88% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,085 psi | 87% | 2451 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,143 psi | 87% | 2546 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,650 psi | 87% | 2454 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,332 psi | 88% | 2543 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,274 psi | 88% | 2566 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,813 psi | 63% | 2421 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 88% | 55,579 psi | 88% | 2425 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,550 psi | 88% | 2441 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,970 psi | 89% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,288 psi | 86% | 2490 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,447 psi | 85% | 2507 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,210 psi | 75% | 2470 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 90% | 54,766 psi | 87% | 2516 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,579 psi | 88% | 2530 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,093 psi | 73% | 2474 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,486 psi | 77% | 2461 fps | 99.3% |
| Winchester 748 | <<locked>> | 90% | 53,766 psi | 85% | 2556 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,101 psi | 89% | 2579 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 41,147 psi | 65% | 2270 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,489 psi | 83% | 2507 fps | 98.9% |
| Accurate 2230 | <<locked>> | 80% | 53,185 psi | 84% | 2516 fps | 99.2% |
| Accurate 2460 | <<locked>> | 80% | 44,309 psi | 70% | 2356 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,446 psi | 53% | 2188 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,566 psi | 63% | 2313 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 31,618 psi | 50% | 2172 fps | 98.9% |
| Accurate 4350 | <<locked>> | 94% | 35,998 psi | 57% | 2320 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 49,559 psi | 79% | 2339 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,951 psi | 79% | 2359 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,623 psi | 60% | 2270 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 36,419 psi | 58% | 2231 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 49,371 psi | 78% | 2441 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,624 psi | 63% | 2287 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 38,421 psi | 61% | 2287 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,730 psi | 72% | 2457 fps | 99.1% |
| Alliant Power Pro 2000-MR | 50.1 gr | 84% | 38,609 psi | 61% | 2379 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,067 psi | 49% | 2156 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,543 psi | 74% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,766 psi | 57% | 2254 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 37,521 psi | 59% | 2336 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,634 psi | 52% | 2254 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,196 psi | 76% | 2336 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,419 psi | 58% | 2267 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 30,284 psi | 48% | 2152 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,655 psi | 66% | 2283 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,536 psi | 59% | 2297 fps | 98.6% |
| Hodgdon CFE223 | 48.8 gr | 80% | 41,133 psi | 65% | 2411 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 45,281 psi | 72% | 2382 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,847 psi | 73% | 2402 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,973 psi | 65% | 2349 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 37,855 psi | 60% | 2283 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,995 psi | 51% | 2192 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,794 psi | 54% | 2247 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,730 psi | 41% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,593 psi | 58% | 2244 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 36,782 psi | 58% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,839 psi | 57% | 2215 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,487 psi | 78% | 2418 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 47,253 psi | 75% | 2323 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 51,401 psi | 81% | 2477 fps | 95.6% |
| IMR 4831 | <<locked>> | 96% | 37,521 psi | 59% | 2329 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 34,316 psi | 54% | 2234 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 39,624 psi | 63% | 2287 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 44,280 psi | 70% | 2362 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 35,940 psi | 57% | 2257 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 38,493 psi | 61% | 2224 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 33,315 psi | 53% | 2175 fps | 97% |
| Lovex S065 | <<locked>> | 96% | 44,440 psi | 70% | 2382 fps | 95.7% |
| Norma 200 | <<locked>> | 80% | 52,286 psi | 83% | 2408 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,869 psi | 58% | 2234 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 36,970 psi | 59% | 2251 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 32,953 psi | 52% | 2198 fps | 95.3% |
| Norma URP | <<locked>> | 94% | 37,130 psi | 59% | 2326 fps | 95% |
| Ramshot Big Game | 48.9 gr | 82% | 34,563 psi | 55% | 2251 fps | 95.5% |
| Ramshot TAC | <<locked>> | 82% | 42,076 psi | 67% | 2329 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,551 psi | 61% | 2300 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,859 psi | 68% | 2326 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,962 psi | 41% | 1368 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,512 psi | 71% | 2365 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,326 psi | 75% | 2428 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 34,548 psi | 55% | 2287 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,718 psi | 46% | 2162 fps | 96.1% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,754 psi | 61% | 2388 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,888 psi | 68% | 2454 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 40,770 psi | 65% | 2283 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,157 psi | 56% | 2192 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 30,371 psi | 48% | 2149 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 44,440 psi | 70% | 2382 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,940 psi | 57% | 2257 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 33,315 psi | 53% | 2175 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,905 psi | 74% | 2375 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,563 psi | 85% | 2162 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,719 psi | 79% | 2451 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,895 psi | 54% | 2241 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,253 psi | 75% | 2369 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,059 psi | 63% | 2303 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,230 psi | 57% | 2244 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,696 psi | 61% | 2208 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,720 psi | 50% | 2090 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 42,337 psi | 67% | 2356 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 38,029 psi | 60% | 2211 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,028 psi | 59% | 2254 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 31,560 psi | 50% | 2159 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 29,153 psi | 46% | 2178 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 43,918 psi | 70% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,783 psi | 61% | 2211 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,069 psi | 54% | 2192 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,867 psi | 55% | 2192 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 28,079 psi | 45% | 2060 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 94% | 38,928 psi | 62% | 2326 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 39,523 psi | 63% | 2280 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 33,518 psi | 53% | 2182 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 38,072 psi | 60% | 2333 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,750 psi | 52% | 2172 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 38,319 psi | 61% | 2316 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,128 psi | 56% | 2241 fps | 96.7% |
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 .338-06 A-Square loaded with the .338 | 225gr | Speer Grand Slam. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,674 fps. Accurate 4350 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 (435 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 Power Pro 2000-MR, Hodgdon CFE223, Ramshot Big Game rank at the top here: for .338-06 A-Square with the .338 | 225gr | Speer Grand Slam 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.