Load Specifications
Load data in caliber .338 RCM with .338 | 225gr | Alaska Bullet Works Kodiak PP SPBC 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 CFE223.
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% | 54,781 psi | 88% | 2457 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,230 psi | 89% | 2549 fps | 99.2% |
| Accurate 2230 | <<locked>> | 82% | 56,043 psi | 90% | 2559 fps | 99.5% |
| Accurate 2460 | <<locked>> | 86% | 53,127 psi | 85% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,071 psi | 88% | 2513 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,694 psi | 88% | 2539 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 54,708 psi | 88% | 2552 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,439 psi | 70% | 2461 fps | 97.1% |
| Accurate LT-30 | <<locked>> | 84% | 55,114 psi | 88% | 2411 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,550 psi | 89% | 2434 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,795 psi | 86% | 2543 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 98% | 54,534 psi | 87% | 2536 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 84% | 55,405 psi | 89% | 2523 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,214 psi | 85% | 2503 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 56,014 psi | 90% | 2523 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,694 psi | 88% | 2598 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 52,779 psi | 85% | 2635 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,577 psi | 86% | 2556 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,824 psi | 88% | 2467 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,607 psi | 88% | 2575 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,932 psi | 70% | 2467 fps | 97.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,372 psi | 81% | 2605 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,925 psi | 86% | 2415 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,185 psi | 85% | 2552 fps | 98.8% |
| Bofors RP3 | <<locked>> | 98% | 53,635 psi | 86% | 2566 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,419 psi | 89% | 2490 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,259 psi | 89% | 2579 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,142 psi | 85% | 2612 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 86% | 53,824 psi | 86% | 2503 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,882 psi | 88% | 2530 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,448 psi | 89% | 2575 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 92% | 54,215 psi | 87% | 2552 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,234 psi | 65% | 2365 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,956 psi | 90% | 2625 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,476 psi | 55% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,622 psi | 89% | 2556 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 53,272 psi | 85% | 2539 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,998 psi | 87% | 2520 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,187 psi | 88% | 2503 fps | 96.4% |
| IMR 4198 | <<locked>> | 86% | 55,405 psi | 89% | 2428 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,809 psi | 86% | 2516 fps | 96.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,669 psi | 67% | 2411 fps | 96.7% |
| IMR 4895 | <<locked>> | 96% | 55,999 psi | 90% | 2605 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 53,214 psi | 85% | 2503 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 53,069 psi | 85% | 2490 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,927 psi | 90% | 2566 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,172 psi | 87% | 2480 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 53,301 psi | 85% | 2516 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,255 psi | 79% | 2464 fps | 96.8% |
| Norma 200 | <<locked>> | 82% | 54,824 psi | 88% | 2441 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,651 psi | 89% | 2536 fps | 100% |
| Norma 202 | <<locked>> | 94% | 56,057 psi | 90% | 2543 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,708 psi | 86% | 2566 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 43,947 psi | 70% | 2461 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 96% | 53,896 psi | 86% | 2585 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 53,534 psi | 86% | 2513 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 92% | 56,028 psi | 90% | 2579 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,418 psi | 87% | 2507 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,882 psi | 56% | 1532 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 56,376 psi | 90% | 2536 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 56,231 psi | 90% | 2559 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,070 psi | 87% | 2631 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 2661 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,395 psi | 70% | 2477 fps | 96.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,730 psi | 72% | 2490 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 90% | 53,722 psi | 86% | 2484 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,130 psi | 90% | 2533 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2556 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,255 psi | 79% | 2464 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,927 psi | 90% | 2566 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,301 psi | 85% | 2516 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,376 psi | 90% | 2507 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,753 psi | 89% | 2185 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,579 psi | 89% | 2533 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2615 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,811 psi | 89% | 2484 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,897 psi | 88% | 2536 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,288 psi | 89% | 2559 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,766 psi | 88% | 2444 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,998 psi | 87% | 2441 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,085 psi | 87% | 2536 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,795 psi | 86% | 2448 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,418 psi | 87% | 2536 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2556 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,073 psi | 63% | 2411 fps | 98.9% |
| Vihtavuori N120 | <<locked>> | 82% | 56,333 psi | 90% | 2375 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,650 psi | 88% | 2418 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,592 psi | 88% | 2434 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,013 psi | 88% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,156 psi | 85% | 2480 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2497 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2461 fps | 97.4% |
| Vihtavuori N530 | <<locked>> | 90% | 53,650 psi | 86% | 2503 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 54,650 psi | 88% | 2523 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,237 psi | 73% | 2464 fps | 97.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2448 fps | 99.2% |
| Winchester 748 | <<locked>> | 92% | 56,057 psi | 90% | 2589 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,114 psi | 88% | 2572 fps | 99.8% |
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% | 40,422 psi | 65% | 2260 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,488 psi | 83% | 2493 fps | 98.8% |
| Accurate 2230 | <<locked>> | 80% | 52,228 psi | 84% | 2507 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 43,714 psi | 70% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,764 psi | 53% | 2182 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,914 psi | 62% | 2306 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 30,966 psi | 50% | 2165 fps | 98.8% |
| Accurate 4350 | <<locked>> | 96% | 37,797 psi | 61% | 2362 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 48,588 psi | 78% | 2329 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,979 psi | 79% | 2349 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,999 psi | 59% | 2264 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 35,665 psi | 57% | 2221 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 48,414 psi | 78% | 2431 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,015 psi | 63% | 2277 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 37,608 psi | 60% | 2280 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,976 psi | 72% | 2451 fps | 99% |
| Alliant Power Pro 2000-MR | 49.2 gr | 84% | 38,000 psi | 61% | 2369 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,501 psi | 49% | 2149 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,788 psi | 73% | 2346 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,186 psi | 56% | 2247 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 96% | 39,073 psi | 63% | 2372 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,113 psi | 55% | 2297 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,442 psi | 76% | 2329 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,189 psi | 61% | 2306 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 29,530 psi | 47% | 2139 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,089 psi | 66% | 2277 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,738 psi | 59% | 2287 fps | 98.4% |
| Hodgdon CFE223 | 47.9 gr | 80% | 40,335 psi | 65% | 2402 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 44,251 psi | 71% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,991 psi | 72% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,030 psi | 64% | 2336 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 37,275 psi | 60% | 2277 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,489 psi | 54% | 2231 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,127 psi | 53% | 2238 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,614 psi | 41% | 1332 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,824 psi | 57% | 2231 fps | 96.8% |
| IMR 3031 | <<locked>> | 80% | 36,013 psi | 58% | 2280 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,070 psi | 56% | 2201 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,559 psi | 78% | 2405 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 46,412 psi | 74% | 2313 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,560 psi | 81% | 2467 fps | 95.4% |
| IMR 4831 | <<locked>> | 96% | 36,680 psi | 59% | 2320 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 33,736 psi | 54% | 2228 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 39,015 psi | 63% | 2277 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 43,439 psi | 70% | 2352 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 35,099 psi | 56% | 2244 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 37,942 psi | 61% | 2218 fps | 96.9% |
| Lovex S062 | <<locked>> | 80% | 32,735 psi | 52% | 2169 fps | 96.8% |
| Lovex S065 | <<locked>> | 96% | 43,526 psi | 70% | 2372 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 51,474 psi | 83% | 2398 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,274 psi | 58% | 2228 fps | 97.8% |
| Norma 202 | <<locked>> | 80% | 36,332 psi | 58% | 2241 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 32,401 psi | 52% | 2192 fps | 95.2% |
| Norma URP | <<locked>> | 96% | 38,682 psi | 62% | 2362 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 82% | 33,939 psi | 54% | 2241 fps | 95.3% |
| Ramshot TAC | <<locked>> | 82% | 41,437 psi | 66% | 2320 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,811 psi | 61% | 2290 fps | 96.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,119 psi | 68% | 2320 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,846 psi | 41% | 1365 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,627 psi | 70% | 2356 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,441 psi | 74% | 2415 fps | 95.3% |
| ReloadSwiss RS 52 | 46.5 gr | 82% | 36,071 psi | 58% | 2326 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,195 psi | 45% | 2152 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,014 psi | 61% | 2375 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,061 psi | 67% | 2441 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 40,059 psi | 64% | 2274 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 34,563 psi | 55% | 2185 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 29,791 psi | 48% | 2139 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,526 psi | 70% | 2372 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,099 psi | 56% | 2244 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 32,735 psi | 52% | 2169 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,064 psi | 74% | 2365 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,968 psi | 85% | 2156 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,834 psi | 78% | 2441 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,272 psi | 53% | 2234 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,427 psi | 74% | 2362 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,363 psi | 63% | 2293 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,505 psi | 57% | 2234 fps | 96.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,029 psi | 61% | 2198 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,154 psi | 50% | 2083 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 41,524 psi | 67% | 2346 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 37,420 psi | 60% | 2201 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,318 psi | 58% | 2244 fps | 96.3% |
| Somchem S355 | <<locked>> | 82% | 31,038 psi | 50% | 2152 fps | 95.2% |
| Somchem S365 | <<locked>> | 90% | 28,631 psi | 46% | 2169 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 53,142 psi | 85% | 2339 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,192 psi | 69% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,130 psi | 61% | 2201 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,344 psi | 53% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,243 psi | 55% | 2185 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 27,543 psi | 44% | 2054 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 94% | 38,305 psi | 61% | 2320 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 38,653 psi | 62% | 2270 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 32,822 psi | 53% | 2172 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 96% | 39,682 psi | 64% | 2369 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,140 psi | 52% | 2162 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 37,507 psi | 60% | 2306 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,621 psi | 56% | 2238 fps | 96.6% |
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 RCM loaded with the .338 | 225gr | Alaska Bullet Works Kodiak PP SPBC. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,661 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 (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 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, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .338 RCM with the .338 | 225gr | Alaska Bullet Works Kodiak PP SPBC 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.