Load Specifications
Load data in caliber .338-06 A-Square with .338 | 225gr | Barnes X S bullet and 98 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, ReloadSwiss RS 52 and Hodgdon LEVERevolution.
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% | 55,317 psi | 88% | 2408 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,288 psi | 88% | 2487 fps | 98.8% |
| Accurate 2230 | <<locked>> | 82% | 56,188 psi | 89% | 2500 fps | 99.1% |
| Accurate 2460 | <<locked>> | 86% | 54,056 psi | 86% | 2434 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,623 psi | 90% | 2474 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,969 psi | 87% | 2487 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,825 psi | 88% | 2507 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,830 psi | 69% | 2408 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 55,114 psi | 87% | 2359 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,506 psi | 88% | 2379 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 57,029 psi | 90% | 2526 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 57,087 psi | 90% | 2379 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 54,317 psi | 86% | 2474 fps | 98.7% |
| ADI AR 2219 | <<locked>> | 84% | 55,332 psi | 88% | 2467 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 56,492 psi | 90% | 2487 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 55,738 psi | 88% | 2470 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,694 psi | 87% | 2539 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 56,202 psi | 89% | 2621 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 56,869 psi | 90% | 2539 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,405 psi | 88% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,679 psi | 87% | 2516 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,338 psi | 70% | 2408 fps | 96.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,299 psi | 80% | 2539 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,983 psi | 86% | 2362 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 56,434 psi | 89% | 2536 fps | 98.7% |
| Bofors RP3 | <<locked>> | 98% | 53,940 psi | 85% | 2510 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,753 psi | 88% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,158 psi | 87% | 2520 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 56,739 psi | 90% | 2602 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 53,708 psi | 85% | 2448 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,824 psi | 87% | 2474 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,680 psi | 88% | 2516 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 82% | 57,043 psi | 90% | 2398 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 54,317 psi | 86% | 2497 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,640 psi | 64% | 2310 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,738 psi | 88% | 2566 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,969 psi | 55% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,463 psi | 88% | 2493 fps | 99.6% |
| IMR 3031 | <<locked>> | 94% | 56,434 psi | 89% | 2526 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,056 psi | 86% | 2461 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,056 psi | 87% | 2438 fps | 95.6% |
| IMR 4198 | <<locked>> | 86% | 55,216 psi | 88% | 2375 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,221 psi | 67% | 2359 fps | 96.1% |
| IMR 4895 | <<locked>> | 96% | 55,999 psi | 89% | 2546 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 92% | 56,492 psi | 90% | 2487 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 53,809 psi | 85% | 2441 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 56,304 psi | 89% | 2513 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,259 psi | 86% | 2421 fps | 99.2% |
| Lovex S062 | <<locked>> | 98% | 56,826 psi | 90% | 2503 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,647 psi | 79% | 2405 fps | 96.1% |
| Norma 200 | <<locked>> | 82% | 55,941 psi | 89% | 2395 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,478 psi | 90% | 2487 fps | 99.9% |
| Norma 202 | <<locked>> | 94% | 56,115 psi | 89% | 2487 fps | 100% |
| Norma 203B | <<locked>> | 98% | 56,942 psi | 90% | 2549 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 44,251 psi | 70% | 2402 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 96% | 53,664 psi | 85% | 2523 fps | 99.1% |
| Ramshot TAC | <<locked>> | 92% | 57,058 psi | 90% | 2500 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,811 psi | 88% | 2520 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,723 psi | 87% | 2451 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,244 psi | 56% | 1496 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 56,405 psi | 89% | 2480 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 56,159 psi | 89% | 2493 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,838 psi | 85% | 2569 fps | 98.9% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,563 psi | 85% | 2598 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,714 psi | 69% | 2418 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 90% | 54,882 psi | 87% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,681 psi | 90% | 2480 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,780 psi | 85% | 2500 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,647 psi | 79% | 2405 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 94% | 56,304 psi | 89% | 2513 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 56,826 psi | 90% | 2503 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,623 psi | 90% | 2454 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,912 psi | 89% | 2139 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,593 psi | 88% | 2477 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 54,984 psi | 87% | 2549 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,869 psi | 89% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,434 psi | 88% | 2484 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,303 psi | 88% | 2503 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,100 psi | 87% | 2395 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,896 psi | 85% | 2385 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,491 psi | 86% | 2484 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 54,317 psi | 86% | 2398 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,230 psi | 86% | 2474 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,418 psi | 86% | 2497 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,595 psi | 63% | 2359 fps | 98.4% |
| Vihtavuori N120 | <<locked>> | 82% | 56,782 psi | 90% | 2329 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 55,245 psi | 88% | 2372 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,679 psi | 87% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,303 psi | 88% | 2454 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 56,405 psi | 89% | 2467 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,547 psi | 83% | 2441 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,383 psi | 74% | 2398 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 90% | 53,940 psi | 85% | 2448 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 54,607 psi | 87% | 2467 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,324 psi | 72% | 2405 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,747 psi | 76% | 2392 fps | 98.7% |
| Winchester 748 | <<locked>> | 92% | 55,854 psi | 89% | 2533 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,955 psi | 87% | 2513 fps | 99.6% |
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% | 41,640 psi | 66% | 2221 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,779 psi | 82% | 2438 fps | 98.3% |
| Accurate 2230 | <<locked>> | 80% | 52,692 psi | 84% | 2451 fps | 98.7% |
| Accurate 2460 | <<locked>> | 80% | 45,020 psi | 71% | 2310 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 35,157 psi | 56% | 2162 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,914 psi | 63% | 2264 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 33,243 psi | 53% | 2146 fps | 98.9% |
| Accurate 4350 | <<locked>> | 96% | 38,682 psi | 61% | 2316 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 49,110 psi | 78% | 2283 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,414 psi | 78% | 2297 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,014 psi | 60% | 2221 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 80% | 53,795 psi | 85% | 2339 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 38,624 psi | 61% | 2221 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 48,588 psi | 77% | 2379 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,755 psi | 63% | 2231 fps | 97.9% |
| Alliant AR-Comp | <<locked>> | 80% | 38,609 psi | 61% | 2244 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,542 psi | 72% | 2398 fps | 98.6% |
| Alliant Power Pro 2000-MR | 47.3 gr | 86% | 41,017 psi | 65% | 2365 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,604 psi | 50% | 2113 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,746 psi | 74% | 2303 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,114 psi | 57% | 2205 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,018 psi | 67% | 2362 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 35,157 psi | 56% | 2254 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,659 psi | 76% | 2280 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 39,001 psi | 62% | 2260 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 31,125 psi | 49% | 2113 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,916 psi | 66% | 2231 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,840 psi | 60% | 2251 fps | 98.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,959 psi | 65% | 2349 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 80% | 44,918 psi | 71% | 2326 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,324 psi | 72% | 2343 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 43,569 psi | 69% | 2336 fps | 95.7% |
| Hodgdon H4198 | <<locked>> | 80% | 53,795 psi | 85% | 2359 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 38,189 psi | 61% | 2231 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 34,301 psi | 54% | 2182 fps | 95.1% |
| Hodgdon LEVERevolution | 43.1 gr | 80% | 34,069 psi | 54% | 2195 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,121 psi | 41% | 1302 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,753 psi | 58% | 2192 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 36,869 psi | 58% | 2241 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,114 psi | 57% | 2162 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 92% | 52,083 psi | 83% | 2398 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 46,688 psi | 74% | 2267 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 39,943 psi | 63% | 2316 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 34,824 psi | 55% | 2188 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 39,755 psi | 63% | 2231 fps | 97.9% |
| Lovex D073.5 | <<locked>> | 80% | 44,643 psi | 71% | 2310 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 36,550 psi | 58% | 2215 fps | 98.7% |
| Lovex S060 | <<locked>> | 80% | 38,783 psi | 61% | 2172 fps | 96.4% |
| Lovex S062 | <<locked>> | 80% | 34,127 psi | 54% | 2136 fps | 96.6% |
| Lovex S065 | <<locked>> | 98% | 46,905 psi | 74% | 2362 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 52,823 psi | 84% | 2359 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,782 psi | 60% | 2192 fps | 97.6% |
| Norma 202 | <<locked>> | 80% | 37,260 psi | 59% | 2201 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 35,534 psi | 56% | 2198 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 41,611 psi | 66% | 2356 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 84% | 37,043 psi | 59% | 2244 fps | 95.5% |
| Ramshot TAC | <<locked>> | 84% | 44,831 psi | 71% | 2320 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,435 psi | 61% | 2244 fps | 96.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,960 psi | 68% | 2270 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 42% | 1335 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,295 psi | 70% | 2306 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 49,864 psi | 79% | 2408 fps | 95.3% |
| ReloadSwiss RS 52 | 43.7 gr | 82% | 36,941 psi | 59% | 2280 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,414 psi | 47% | 2116 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 41,075 psi | 65% | 2372 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 41,771 psi | 66% | 2238 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 36,071 psi | 57% | 2152 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 33,257 psi | 53% | 2156 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 46,905 psi | 74% | 2362 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,550 psi | 58% | 2215 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 34,127 psi | 54% | 2136 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,775 psi | 74% | 2316 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,345 psi | 85% | 2113 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,110 psi | 78% | 2388 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 36,129 psi | 57% | 2234 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,934 psi | 74% | 2313 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 42,815 psi | 68% | 2293 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,274 psi | 57% | 2188 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,175 psi | 62% | 2159 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,285 psi | 51% | 2047 fps | 99% |
| Somchem S321 | <<locked>> | 80% | 42,264 psi | 67% | 2300 fps | 98.7% |
| Somchem S335 | <<locked>> | 80% | 38,696 psi | 61% | 2165 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 37,115 psi | 59% | 2198 fps | 95.8% |
| Somchem S355 | <<locked>> | 84% | 34,258 psi | 54% | 2162 fps | 95.6% |
| Somchem S365 | <<locked>> | 92% | 31,531 psi | 50% | 2178 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 53,577 psi | 85% | 2293 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 44,121 psi | 70% | 2224 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,986 psi | 62% | 2162 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,592 psi | 55% | 2149 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,346 psi | 56% | 2149 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 80% | 29,037 psi | 46% | 2028 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 96% | 41,379 psi | 66% | 2313 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 39,537 psi | 63% | 2224 fps | 98% |
| Vihtavuori N540 | <<locked>> | 80% | 33,968 psi | 54% | 2136 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 98% | 42,786 psi | 68% | 2362 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,186 psi | 56% | 2165 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 38,232 psi | 61% | 2260 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,404 psi | 56% | 2192 fps | 96.1% |
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 98 powders for .338-06 A-Square loaded with the .338 | 225gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,460 fps to 2,621 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 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 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- TS 15.5, Alliant Reloder-16 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, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for .338-06 A-Square with the .338 | 225gr | Barnes X S 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.