Load Specifications
Bullet Manufacturer:Hornady
Bullet Weight:225 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 RCM load data
Case Length (l3):2"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:71 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:16.5
Load data in caliber .338 RCM with .338 | 225gr | Hornady InterLock bullet and 102 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 54,447 psi | 87% | 2470 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,955 psi | 88% | 2559 fps | 99.3% |
| Accurate 2230 | <<locked>> | 82% | 55,782 psi | 89% | 2572 fps | 99.5% |
| Accurate 2460 | <<locked>> | 86% | 52,924 psi | 85% | 2497 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,491 psi | 87% | 2523 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,505 psi | 87% | 2552 fps | 100% |
| Accurate 2700 | <<locked>> | 96% | 56,362 psi | 90% | 2520 fps | 95.9% |
| Accurate 4064 | <<locked>> | 98% | 54,186 psi | 87% | 2562 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,047 psi | 69% | 2470 fps | 97.2% |
| Accurate LT-30 | <<locked>> | 84% | 54,940 psi | 88% | 2425 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,405 psi | 89% | 2448 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,432 psi | 86% | 2556 fps | 99.6% |
| ADI AR 2207 | <<locked>> | 82% | 56,304 psi | 90% | 2434 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 54,549 psi | 87% | 2549 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 55,361 psi | 89% | 2536 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 56,347 psi | 90% | 2559 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 56,231 psi | 90% | 2539 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,563 psi | 87% | 2612 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 52,910 psi | 85% | 2654 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,447 psi | 86% | 2569 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,447 psi | 87% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,491 psi | 87% | 2589 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,976 psi | 71% | 2484 fps | 97.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,575 psi | 81% | 2625 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,809 psi | 86% | 2425 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,359 psi | 86% | 2572 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 53,577 psi | 86% | 2582 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,216 psi | 89% | 2503 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,056 psi | 88% | 2589 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,505 psi | 86% | 2631 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 53,795 psi | 86% | 2516 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,897 psi | 88% | 2546 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,463 psi | 89% | 2592 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 92% | 53,925 psi | 86% | 2566 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,958 psi | 64% | 2379 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 56,144 psi | 90% | 2641 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,330 psi | 55% | 1503 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,680 psi | 89% | 2569 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 53,142 psi | 85% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,056 psi | 87% | 2536 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,129 psi | 88% | 2520 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 55,376 psi | 89% | 2441 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,940 psi | 86% | 2533 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,582 psi | 67% | 2428 fps | 96.9% |
| IMR 4895 | <<locked>> | 96% | 55,883 psi | 90% | 2618 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 92% | 56,347 psi | 90% | 2559 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 56,420 psi | 90% | 2549 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 52,823 psi | 85% | 2503 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 56,014 psi | 90% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,983 psi | 87% | 2493 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 53,098 psi | 85% | 2533 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,950 psi | 78% | 2474 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 54,215 psi | 87% | 2451 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,448 psi | 89% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 94% | 55,999 psi | 90% | 2556 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,592 psi | 86% | 2579 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 43,642 psi | 70% | 2470 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 54,012 psi | 87% | 2602 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 53,650 psi | 86% | 2533 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 56,231 psi | 90% | 2598 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,346 psi | 87% | 2520 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,650 psi | 56% | 1539 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 52,779 psi | 85% | 2503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 56,246 psi | 90% | 2575 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,360 psi | 87% | 2651 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,114 psi | 87% | 2680 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,178 psi | 69% | 2490 fps | 96.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,788 psi | 72% | 2510 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 53,171 psi | 85% | 2493 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,970 psi | 90% | 2546 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,127 psi | 85% | 2569 fps | 99.8% |
| Shooters World AR Plus | <<locked>> | 82% | 56,420 psi | 90% | 2549 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,950 psi | 78% | 2474 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 94% | 56,014 psi | 90% | 2582 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,098 psi | 85% | 2533 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,420 psi | 90% | 2523 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,637 psi | 89% | 2198 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,651 psi | 89% | 2549 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,637 psi | 89% | 2631 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,651 psi | 89% | 2497 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,998 psi | 88% | 2556 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,463 psi | 89% | 2579 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,578 psi | 88% | 2457 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,085 psi | 87% | 2454 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,288 psi | 87% | 2552 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,417 psi | 86% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,578 psi | 88% | 2552 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2569 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,696 psi | 62% | 2421 fps | 99% |
| Vihtavuori N120 | <<locked>> | 82% | 56,173 psi | 90% | 2388 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,578 psi | 88% | 2431 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,534 psi | 87% | 2448 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,042 psi | 88% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,113 psi | 85% | 2493 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,243 psi | 84% | 2510 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,108 psi | 74% | 2474 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 90% | 53,664 psi | 86% | 2520 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 54,737 psi | 88% | 2536 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,165 psi | 72% | 2477 fps | 97.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,442 psi | 76% | 2467 fps | 99.3% |
| Winchester 748 | <<locked>> | 92% | 56,391 psi | 90% | 2608 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,969 psi | 88% | 2585 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% | 39,943 psi | 64% | 2270 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,532 psi | 83% | 2513 fps | 98.9% |
| Accurate 2230 | <<locked>> | 80% | 51,967 psi | 83% | 2520 fps | 99.2% |
| Accurate 2460 | <<locked>> | 80% | 42,989 psi | 69% | 2356 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,763 psi | 51% | 2178 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,290 psi | 61% | 2313 fps | 99.5% |
| Accurate 2700 | <<locked>> | 94% | 52,953 psi | 85% | 2477 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 30,110 psi | 48% | 2162 fps | 98.8% |
| Accurate 4350 | <<locked>> | 96% | 37,420 psi | 60% | 2369 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 48,486 psi | 78% | 2343 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,892 psi | 78% | 2362 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,564 psi | 59% | 2270 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 80% | 53,156 psi | 85% | 2398 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 35,491 psi | 57% | 2234 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 48,370 psi | 78% | 2448 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,638 psi | 62% | 2287 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 37,333 psi | 60% | 2290 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,643 psi | 72% | 2461 fps | 99.1% |
| Alliant Power Pro 2000-MR | 50.2 gr | 84% | 37,623 psi | 60% | 2379 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,994 psi | 48% | 2152 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,440 psi | 73% | 2359 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,693 psi | 56% | 2254 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 36,550 psi | 59% | 2336 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 31,604 psi | 51% | 2251 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,340 psi | 76% | 2343 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,433 psi | 57% | 2267 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 29,051 psi | 47% | 2146 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,741 psi | 65% | 2287 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,405 psi | 58% | 2297 fps | 98.5% |
| Hodgdon CFE223 | 49 gr | 80% | 40,335 psi | 65% | 2418 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 44,266 psi | 71% | 2385 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,773 psi | 72% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 39,798 psi | 64% | 2349 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 36,811 psi | 59% | 2283 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,154 psi | 50% | 2192 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,808 psi | 53% | 2247 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,367 psi | 41% | 1339 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,665 psi | 57% | 2244 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 35,694 psi | 57% | 2290 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,838 psi | 56% | 2215 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,515 psi | 78% | 2421 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 46,441 psi | 74% | 2329 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,459 psi | 81% | 2484 fps | 95.6% |
| IMR 4831 | <<locked>> | 96% | 36,332 psi | 58% | 2326 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 33,243 psi | 53% | 2234 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 80% | 38,638 psi | 62% | 2287 fps | 98.4% |
| Lovex D073.4 | <<locked>> | 80% | 52,620 psi | 84% | 2500 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,931 psi | 69% | 2362 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 34,650 psi | 56% | 2254 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 37,594 psi | 60% | 2228 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 32,169 psi | 52% | 2172 fps | 96.8% |
| Lovex S065 | <<locked>> | 96% | 43,207 psi | 69% | 2382 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 50,908 psi | 82% | 2408 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,650 psi | 57% | 2231 fps | 97.8% |
| Norma 202 | <<locked>> | 80% | 35,897 psi | 58% | 2251 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 31,879 psi | 51% | 2198 fps | 95.2% |
| Norma URP | <<locked>> | 96% | 38,421 psi | 62% | 2375 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 82% | 33,576 psi | 54% | 2251 fps | 95.4% |
| Ramshot TAC | <<locked>> | 82% | 41,075 psi | 66% | 2329 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,521 psi | 60% | 2303 fps | 96.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,814 psi | 67% | 2329 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,527 psi | 41% | 1371 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,482 psi | 70% | 2369 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,238 psi | 74% | 2431 fps | 95.5% |
| ReloadSwiss RS 52 | 46.4 gr | 80% | 33,504 psi | 54% | 2287 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,760 psi | 45% | 2159 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 37,782 psi | 61% | 2388 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 41,800 psi | 67% | 2454 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 39,378 psi | 63% | 2280 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 33,953 psi | 54% | 2192 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 84% | 31,169 psi | 50% | 2188 fps | 95.8% |
| Shooters World AR Plus | <<locked>> | 80% | 52,620 psi | 84% | 2500 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,207 psi | 69% | 2382 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,650 psi | 56% | 2254 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 32,169 psi | 52% | 2172 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,876 psi | 74% | 2379 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,852 psi | 85% | 2169 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,675 psi | 78% | 2454 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 32,880 psi | 53% | 2241 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,325 psi | 74% | 2375 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 38,914 psi | 62% | 2303 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,201 psi | 56% | 2244 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,724 psi | 60% | 2208 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,792 psi | 49% | 2090 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 41,191 psi | 66% | 2356 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 36,927 psi | 59% | 2211 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,013 psi | 58% | 2254 fps | 96.4% |
| Somchem S355 | <<locked>> | 82% | 30,429 psi | 49% | 2156 fps | 95.2% |
| Somchem S365 | <<locked>> | 90% | 28,065 psi | 45% | 2172 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 53,040 psi | 85% | 2352 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,902 psi | 69% | 2277 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,855 psi | 61% | 2211 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,909 psi | 53% | 2188 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,823 psi | 54% | 2192 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 27,006 psi | 43% | 2057 fps | 95.3% |
| Vihtavuori N160 | <<locked>> | 94% | 38,072 psi | 61% | 2329 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,450 psi | 62% | 2283 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 32,474 psi | 52% | 2182 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 94% | 36,956 psi | 59% | 2329 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 31,966 psi | 51% | 2175 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,289 psi | 60% | 2320 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,113 psi | 55% | 2241 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 102 powders for .338 RCM loaded with the .338 | 225gr | Hornady InterLock. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,680 fps. Accurate 4350 gives the best case fill at 100 %, and 102 of the 102 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 1:16.5 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 | Hornady InterLock 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.