Load Specifications
Load data in caliber .338 RCM with .338 | 210gr | Nosler Partition 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.
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% | 53,722 psi | 86% | 2552 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,070 psi | 87% | 2635 fps | 98.7% |
| Accurate 2230 | <<locked>> | 82% | 54,737 psi | 88% | 2648 fps | 99.1% |
| Accurate 2460 | <<locked>> | 88% | 55,680 psi | 89% | 2621 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,925 psi | 86% | 2608 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,258 psi | 85% | 2628 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,447 psi | 86% | 2641 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,061 psi | 67% | 2533 fps | 96.2% |
| Accurate LT-30 | <<locked>> | 84% | 53,969 psi | 87% | 2503 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,360 psi | 87% | 2523 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,898 psi | 90% | 2677 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 55,463 psi | 89% | 2520 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,577 psi | 86% | 2625 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 84% | 54,273 psi | 87% | 2615 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,477 psi | 89% | 2638 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 54,897 psi | 88% | 2621 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,519 psi | 86% | 2687 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,332 psi | 89% | 2776 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,724 psi | 89% | 2687 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,824 psi | 86% | 2562 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,476 psi | 86% | 2664 fps | 98.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,236 psi | 69% | 2546 fps | 96.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,385 psi | 79% | 2687 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,069 psi | 85% | 2503 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,695 psi | 89% | 2690 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2703 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,607 psi | 88% | 2582 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,940 psi | 86% | 2664 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,912 psi | 90% | 2756 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 88% | 56,130 psi | 90% | 2638 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,737 psi | 86% | 2621 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,346 psi | 87% | 2661 fps | 98% |
| Hodgdon H4198 | <<locked>> | 82% | 56,217 psi | 90% | 2549 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 56,376 psi | 90% | 2687 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,334 psi | 63% | 2441 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,795 psi | 88% | 2713 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,330 psi | 55% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,723 psi | 88% | 2648 fps | 99.6% |
| IMR 3031 | <<locked>> | 94% | 55,347 psi | 89% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,156 psi | 85% | 2608 fps | 98.9% |
| IMR 4198 | <<locked>> | 86% | 54,389 psi | 87% | 2523 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,785 psi | 65% | 2490 fps | 95.9% |
| IMR 4895 | <<locked>> | 96% | 54,824 psi | 88% | 2694 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 92% | 55,477 psi | 89% | 2638 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 82% | 55,506 psi | 89% | 2628 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,811 psi | 89% | 2631 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,940 psi | 88% | 2657 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,359 psi | 86% | 2569 fps | 99.2% |
| Lovex S062 | <<locked>> | 98% | 55,622 psi | 89% | 2651 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2543 fps | 96% |
| Norma 200 | <<locked>> | 82% | 53,838 psi | 86% | 2536 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,839 psi | 88% | 2631 fps | 99.9% |
| Norma 202 | <<locked>> | 94% | 55,143 psi | 88% | 2638 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,898 psi | 90% | 2697 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 42,786 psi | 69% | 2533 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 96% | 52,620 psi | 84% | 2671 fps | 99.1% |
| Ramshot TAC | <<locked>> | 92% | 56,246 psi | 90% | 2651 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,100 psi | 88% | 2671 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,606 psi | 86% | 2595 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,679 psi | 56% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,376 psi | 89% | 2628 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,376 psi | 89% | 2648 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,026 psi | 85% | 2723 fps | 98.9% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2753 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 55,912 psi | 90% | 2618 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 54,984 psi | 88% | 2621 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 2641 fps | 99.5% |
| Shooters World AR Plus | <<locked>> | 82% | 55,506 psi | 89% | 2628 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2543 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,940 psi | 88% | 2657 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 55,622 psi | 89% | 2651 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,622 psi | 89% | 2602 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,969 psi | 88% | 2277 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,563 psi | 87% | 2625 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2703 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,752 psi | 88% | 2579 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,940 psi | 86% | 2625 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,418 psi | 87% | 2651 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,809 psi | 86% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2569 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,127 psi | 85% | 2625 fps | 99.9% |
| Somchem S335 | <<locked>> | 94% | 56,115 psi | 90% | 2579 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,417 psi | 86% | 2621 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,011 psi | 85% | 2644 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,029 psi | 61% | 2484 fps | 98.2% |
| Vihtavuori N120 | <<locked>> | 82% | 55,347 psi | 89% | 2470 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,853 psi | 86% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,592 psi | 86% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,809 psi | 86% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,535 psi | 89% | 2615 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,140 psi | 82% | 2582 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,121 psi | 72% | 2536 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 92% | 56,275 psi | 90% | 2641 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 53,693 psi | 86% | 2612 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,164 psi | 71% | 2543 fps | 96.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,673 psi | 75% | 2530 fps | 98.7% |
| Winchester 748 | <<locked>> | 92% | 54,839 psi | 88% | 2680 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,722 psi | 86% | 2657 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% | 39,581 psi | 63% | 2346 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,546 psi | 81% | 2582 fps | 98.3% |
| Accurate 2230 | <<locked>> | 80% | 51,126 psi | 82% | 2595 fps | 98.6% |
| Accurate 2460 | <<locked>> | 80% | 42,641 psi | 68% | 2431 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 31,821 psi | 51% | 2254 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 37,869 psi | 61% | 2382 fps | 99.1% |
| Accurate 4064 | <<locked>> | 80% | 30,139 psi | 48% | 2234 fps | 98.2% |
| Accurate 4350 | <<locked>> | 98% | 39,334 psi | 63% | 2484 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 48,051 psi | 77% | 2421 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,428 psi | 78% | 2441 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,143 psi | 58% | 2336 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 80% | 52,417 psi | 84% | 2480 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 37,144 psi | 60% | 2339 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 47,340 psi | 76% | 2520 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,087 psi | 61% | 2352 fps | 97.7% |
| Alliant AR-Comp | <<locked>> | 80% | 36,912 psi | 59% | 2365 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,816 psi | 70% | 2530 fps | 98.4% |
| Alliant Power Pro 2000-MR | 52.3 gr | 86% | 39,784 psi | 64% | 2500 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,618 psi | 51% | 2264 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,918 psi | 72% | 2434 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,579 psi | 59% | 2369 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,509 psi | 65% | 2493 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,766 psi | 57% | 2421 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,659 psi | 75% | 2418 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 40,030 psi | 64% | 2434 fps | 95.7% |
| Bofors RP3 | <<locked>> | 82% | 30,893 psi | 50% | 2260 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,263 psi | 65% | 2356 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,984 psi | 58% | 2365 fps | 97.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,639 psi | 64% | 2480 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 80% | 43,439 psi | 70% | 2457 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,063 psi | 71% | 2477 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 41,959 psi | 67% | 2464 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 80% | 52,895 psi | 85% | 2507 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,332 psi | 58% | 2349 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,809 psi | 56% | 2346 fps | 95.5% |
| Hodgdon LEVERevolution | 47.7 gr | 80% | 32,518 psi | 52% | 2310 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,570 psi | 41% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,157 psi | 56% | 2306 fps | 96% |
| IMR 3031 | <<locked>> | 80% | 35,114 psi | 56% | 2359 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 36,651 psi | 59% | 2326 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 45,571 psi | 73% | 2405 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 38,087 psi | 61% | 2438 fps | 95% |
| IMR 4895 | <<locked>> | 82% | 35,143 psi | 56% | 2349 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 38,087 psi | 61% | 2352 fps | 97.7% |
| Lovex D073.4 | <<locked>> | 80% | 51,851 psi | 83% | 2579 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,540 psi | 68% | 2434 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 34,214 psi | 55% | 2320 fps | 98.3% |
| Lovex S060 | <<locked>> | 80% | 37,188 psi | 60% | 2293 fps | 96.1% |
| Lovex S062 | <<locked>> | 80% | 31,981 psi | 51% | 2238 fps | 95.9% |
| Lovex S065 | <<locked>> | 98% | 45,382 psi | 73% | 2497 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 50,386 psi | 81% | 2490 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,433 psi | 57% | 2300 fps | 97% |
| Norma 202 | <<locked>> | 80% | 35,476 psi | 57% | 2320 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 33,765 psi | 54% | 2310 fps | 95% |
| Norma URP | <<locked>> | 98% | 40,248 psi | 65% | 2484 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 84% | 35,418 psi | 57% | 2362 fps | 95.1% |
| Ramshot TAC | <<locked>> | 84% | 43,410 psi | 70% | 2451 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,028 psi | 59% | 2369 fps | 96% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,336 psi | 66% | 2398 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,759 psi | 41% | 1430 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,772 psi | 69% | 2438 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 48,602 psi | 78% | 2546 fps | 95.2% |
| ReloadSwiss RS 52 | 49.5 gr | 84% | 37,797 psi | 61% | 2454 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,515 psi | 47% | 2270 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 39,291 psi | 63% | 2356 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 33,808 psi | 54% | 2257 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 86% | 33,025 psi | 53% | 2303 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 51,851 psi | 83% | 2579 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 45,382 psi | 73% | 2497 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,214 psi | 55% | 2320 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 31,981 psi | 51% | 2238 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,281 psi | 73% | 2451 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,301 psi | 84% | 2247 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,935 psi | 77% | 2533 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,722 psi | 56% | 2352 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,585 psi | 73% | 2451 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 41,089 psi | 66% | 2418 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,693 psi | 56% | 2306 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,376 psi | 60% | 2280 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,530 psi | 49% | 2156 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 40,654 psi | 65% | 2425 fps | 98.5% |
| Somchem S335 | <<locked>> | 80% | 36,608 psi | 59% | 2280 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 35,549 psi | 57% | 2316 fps | 95.4% |
| Somchem S355 | <<locked>> | 84% | 32,300 psi | 52% | 2267 fps | 95% |
| Somchem S365 | <<locked>> | 92% | 29,762 psi | 48% | 2283 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 52,330 psi | 84% | 2434 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,424 psi | 68% | 2352 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,405 psi | 60% | 2283 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,561 psi | 52% | 2260 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 33,388 psi | 54% | 2257 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 82% | 28,761 psi | 46% | 2165 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 96% | 39,900 psi | 64% | 2441 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 37,898 psi | 61% | 2349 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 80% | 32,097 psi | 51% | 2244 fps | 98.2% |
| Vihtavuori N550 | <<locked>> | 98% | 41,336 psi | 66% | 2490 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,794 psi | 54% | 2280 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 36,811 psi | 59% | 2385 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,750 psi | 54% | 2306 fps | 95.7% |
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 98 powders for .338 RCM loaded with the .338 | 210gr | Nosler Partition. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,562 fps to 2,776 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 210.0 gr projectile in 0.338" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- 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 RCM with the .338 | 210gr | Nosler Partition 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.