Load Specifications
Load data in caliber .338 RCM with .338 | 225gr | Speer Deep Curl Soft Point 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 Power Pro 2000-MR, Hodgdon CFE223 and ReloadSwiss RS 52.
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 | 89% | 2477 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,912 psi | 90% | 2566 fps | 99.4% |
| Accurate 2460 | <<locked>> | 86% | 54,346 psi | 87% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,420 psi | 90% | 2536 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,550 psi | 89% | 2556 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,898 psi | 90% | 2572 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,498 psi | 71% | 2484 fps | 97.5% |
| Accurate LT-30 | <<locked>> | 84% | 55,738 psi | 89% | 2428 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,217 psi | 90% | 2451 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,578 psi | 88% | 2562 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 98% | 55,550 psi | 89% | 2559 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 84% | 56,376 psi | 90% | 2543 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,056 psi | 87% | 2523 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 53,795 psi | 86% | 2507 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,753 psi | 89% | 2621 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,983 psi | 87% | 2664 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,621 psi | 88% | 2575 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,637 psi | 89% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,666 psi | 89% | 2598 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2490 fps | 97.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2628 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,665 psi | 88% | 2431 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,099 psi | 87% | 2575 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 55,013 psi | 88% | 2592 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,202 psi | 90% | 2510 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,275 psi | 90% | 2598 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,259 psi | 87% | 2635 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 86% | 54,810 psi | 88% | 2523 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,999 psi | 90% | 2552 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 52,982 psi | 85% | 2552 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 92% | 55,056 psi | 88% | 2572 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,031 psi | 66% | 2388 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,519 psi | 86% | 2602 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 56% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,345 psi | 86% | 2533 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 54,331 psi | 87% | 2559 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,100 psi | 88% | 2543 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,144 psi | 90% | 2526 fps | 96.8% |
| IMR 4198 | <<locked>> | 86% | 56,217 psi | 90% | 2444 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2536 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,569 psi | 68% | 2434 fps | 97.1% |
| IMR 4895 | <<locked>> | 94% | 53,388 psi | 86% | 2579 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 54,056 psi | 87% | 2523 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 54,230 psi | 87% | 2513 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,592 psi | 86% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,955 psi | 88% | 2500 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 54,346 psi | 87% | 2539 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,198 psi | 80% | 2487 fps | 97.1% |
| Norma 200 | <<locked>> | 82% | 55,593 psi | 89% | 2457 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,417 psi | 86% | 2513 fps | 100% |
| Norma 202 | <<locked>> | 92% | 53,751 psi | 86% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,752 psi | 88% | 2585 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 44,773 psi | 72% | 2480 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 96% | 55,129 psi | 88% | 2612 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,433 psi | 87% | 2536 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,664 psi | 86% | 2556 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,419 psi | 89% | 2530 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,853 psi | 56% | 1539 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,853 psi | 86% | 2510 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,751 psi | 86% | 2533 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,593 psi | 89% | 2657 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2687 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,440 psi | 71% | 2503 fps | 97.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,861 psi | 74% | 2523 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 90% | 54,679 psi | 88% | 2503 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,896 psi | 86% | 2513 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2579 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,198 psi | 80% | 2487 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,592 psi | 86% | 2543 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,346 psi | 87% | 2539 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,693 psi | 86% | 2484 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,347 psi | 90% | 2201 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,142 psi | 85% | 2510 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,113 psi | 85% | 2592 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,432 psi | 86% | 2461 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,275 psi | 90% | 2566 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 52,982 psi | 85% | 2539 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,666 psi | 89% | 2464 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,085 psi | 88% | 2461 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,158 psi | 88% | 2559 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,578 psi | 88% | 2464 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,347 psi | 89% | 2556 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2579 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,827 psi | 64% | 2434 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 88% | 55,593 psi | 89% | 2438 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,521 psi | 89% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,985 psi | 90% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,215 psi | 87% | 2500 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2516 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,224 psi | 76% | 2480 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 90% | 54,766 psi | 88% | 2526 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,593 psi | 89% | 2543 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,108 psi | 74% | 2487 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,501 psi | 78% | 2474 fps | 99.4% |
| Winchester 748 | <<locked>> | 90% | 53,780 psi | 86% | 2569 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,101 psi | 90% | 2592 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 | 66% | 2280 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,504 psi | 84% | 2520 fps | 99% |
| Accurate 2460 | <<locked>> | 80% | 44,324 psi | 71% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,431 psi | 54% | 2198 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,566 psi | 63% | 2326 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 31,618 psi | 51% | 2185 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 36,013 psi | 58% | 2333 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 49,342 psi | 79% | 2346 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,661 psi | 80% | 2365 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,637 psi | 60% | 2283 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 34,229 psi | 55% | 2198 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 49,385 psi | 79% | 2454 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,624 psi | 64% | 2297 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 38,435 psi | 62% | 2297 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,730 psi | 73% | 2470 fps | 99.2% |
| Alliant Power Pro 2000-MR | 48.9 gr | 82% | 36,100 psi | 58% | 2336 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,067 psi | 50% | 2169 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,557 psi | 75% | 2365 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,591 psi | 54% | 2221 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 37,536 psi | 60% | 2349 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,648 psi | 52% | 2270 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,196 psi | 77% | 2346 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,419 psi | 58% | 2280 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 30,298 psi | 49% | 2165 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,669 psi | 67% | 2293 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,536 psi | 60% | 2310 fps | 98.7% |
| Hodgdon CFE223 | 48.8 gr | 80% | 41,118 psi | 66% | 2421 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 80% | 45,223 psi | 73% | 2392 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,861 psi | 74% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 38,261 psi | 61% | 2310 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 37,869 psi | 61% | 2297 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,995 psi | 51% | 2205 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,808 psi | 54% | 2260 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,730 psi | 41% | 1342 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,593 psi | 59% | 2257 fps | 97.2% |
| IMR 3031 | <<locked>> | 80% | 36,753 psi | 59% | 2300 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,634 psi | 54% | 2178 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,487 psi | 79% | 2431 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 47,253 psi | 76% | 2333 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 48,428 psi | 78% | 2448 fps | 95.1% |
| IMR 4831 | <<locked>> | 96% | 37,507 psi | 60% | 2343 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 34,316 psi | 55% | 2247 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 80% | 39,624 psi | 64% | 2297 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 44,295 psi | 71% | 2375 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 35,911 psi | 58% | 2267 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 38,508 psi | 62% | 2238 fps | 97.2% |
| Lovex S062 | <<locked>> | 80% | 33,315 psi | 53% | 2188 fps | 97.1% |
| Lovex S065 | <<locked>> | 94% | 41,800 psi | 67% | 2349 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 52,301 psi | 84% | 2418 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,869 psi | 59% | 2247 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 36,970 psi | 59% | 2264 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 32,953 psi | 53% | 2211 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 37,144 psi | 60% | 2339 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 82% | 34,563 psi | 55% | 2264 fps | 95.7% |
| Ramshot TAC | <<locked>> | 82% | 42,090 psi | 67% | 2343 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,537 psi | 62% | 2313 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,873 psi | 69% | 2339 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,962 psi | 42% | 1375 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,512 psi | 71% | 2375 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,340 psi | 76% | 2441 fps | 95.7% |
| ReloadSwiss RS 52 | 46.3 gr | 80% | 34,563 psi | 55% | 2300 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,732 psi | 46% | 2175 fps | 96.3% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,769 psi | 62% | 2402 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,859 psi | 69% | 2467 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 40,785 psi | 65% | 2297 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,172 psi | 56% | 2205 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 30,371 psi | 49% | 2159 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,800 psi | 67% | 2349 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,911 psi | 58% | 2267 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 33,315 psi | 53% | 2188 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,905 psi | 75% | 2388 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,563 psi | 86% | 2169 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,734 psi | 80% | 2464 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,910 psi | 54% | 2254 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,268 psi | 76% | 2382 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,059 psi | 64% | 2316 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,230 psi | 58% | 2257 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,696 psi | 62% | 2218 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,734 psi | 51% | 2100 fps | 99.4% |
| Somchem S321 | <<locked>> | 80% | 42,279 psi | 68% | 2365 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 38,029 psi | 61% | 2221 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,043 psi | 59% | 2267 fps | 96.7% |
| Somchem S355 | <<locked>> | 82% | 31,575 psi | 51% | 2172 fps | 95.6% |
| Somchem S365 | <<locked>> | 90% | 29,167 psi | 47% | 2192 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 43,888 psi | 70% | 2283 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,798 psi | 62% | 2221 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,026 psi | 55% | 2201 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,882 psi | 56% | 2205 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 28,079 psi | 45% | 2073 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 94% | 38,899 psi | 62% | 2339 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 39,523 psi | 63% | 2293 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 33,533 psi | 54% | 2192 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 38,072 psi | 61% | 2346 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,764 psi | 53% | 2185 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 38,334 psi | 61% | 2329 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,143 psi | 56% | 2254 fps | 96.9% |
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 RCM loaded with the .338 | 225gr | Speer Deep Curl Soft Point. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,687 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,687 fps. Accurate 4350 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 (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:16.0 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, ReloadSwiss RS 52 rank at the top here: for .338 RCM with the .338 | 225gr | Speer Deep Curl Soft Point 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.