Load Specifications
Bullet:.338 | 227gr | CutEdge MTAC
Bullet Manufacturer:Cutting Edge
Bullet Weight:227 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Weatherby RPM load data
Case Length (l3):2.55"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:81.6 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:11.5
Load data in caliber .338 Weatherby RPM with .338 | 227gr | CutEdge MTAC bullet and 107 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.
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% | 57,319 psi | 88% | 2516 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 57,638 psi | 89% | 2612 fps | 99.7% |
| Accurate 2460 | <<locked>> | 86% | 55,854 psi | 86% | 2543 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,986 psi | 89% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,609 psi | 89% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,622 psi | 86% | 2533 fps | 96.3% |
| Accurate 4064 | <<locked>> | 98% | 57,711 psi | 89% | 2612 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,311 psi | 71% | 2533 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 84% | 57,145 psi | 88% | 2467 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,609 psi | 89% | 2490 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,434 psi | 87% | 2608 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 98% | 57,276 psi | 88% | 2602 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 84% | 58,233 psi | 90% | 2582 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,695 psi | 86% | 2566 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,796 psi | 86% | 2543 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 57,363 psi | 88% | 2661 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 56,014 psi | 86% | 2717 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,579 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 57,334 psi | 88% | 2520 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 57,363 psi | 88% | 2641 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,427 psi | 71% | 2546 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2684 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,231 psi | 87% | 2467 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,202 psi | 86% | 2625 fps | 99.5% |
| Bofors RP3 | <<locked>> | 98% | 57,130 psi | 88% | 2638 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,201 psi | 83% | 2552 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,943 psi | 89% | 2552 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 58,189 psi | 90% | 2641 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,565 psi | 87% | 2687 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 56,666 psi | 87% | 2562 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,696 psi | 89% | 2589 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 58,784 psi | 90% | 2651 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 50,024 psi | 77% | 2582 fps | 96.4% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2605 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 92% | 56,927 psi | 88% | 2618 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,395 psi | 65% | 2438 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,564 psi | 85% | 2644 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,606 psi | 53% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 58,566 psi | 90% | 2621 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 56,173 psi | 86% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,898 psi | 88% | 2589 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,638 psi | 89% | 2572 fps | 97.5% |
| IMR 4198 | <<locked>> | 86% | 57,769 psi | 89% | 2480 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,507 psi | 87% | 2589 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,309 psi | 68% | 2484 fps | 97.9% |
| IMR 4895 | <<locked>> | 94% | 55,434 psi | 85% | 2628 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 55,695 psi | 86% | 2566 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,579 psi | 86% | 2552 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,347 psi | 85% | 2585 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,565 psi | 87% | 2543 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 56,086 psi | 86% | 2582 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,648 psi | 79% | 2530 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,110 psi | 76% | 2513 fps | 96.3% |
| Norma 200 | <<locked>> | 82% | 56,811 psi | 87% | 2490 fps | 100% |
| Norma 201 | <<locked>> | 94% | 58,552 psi | 90% | 2602 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,419 psi | 85% | 2559 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,420 psi | 87% | 2631 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 46,528 psi | 72% | 2533 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 96% | 57,145 psi | 88% | 2657 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,716 psi | 70% | 2520 fps | 96.2% |
| Ramshot TAC | <<locked>> | 90% | 56,391 psi | 87% | 2585 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,288 psi | 85% | 2598 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 57,000 psi | 88% | 2572 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,940 psi | 54% | 1558 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,347 psi | 85% | 2549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,579 psi | 86% | 2585 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 57,986 psi | 89% | 2710 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,363 psi | 88% | 2736 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,079 psi | 71% | 2552 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,456 psi | 73% | 2579 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 90% | 55,637 psi | 86% | 2536 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 58,668 psi | 90% | 2595 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,695 psi | 87% | 2625 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,201 psi | 83% | 2552 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,648 psi | 79% | 2530 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,347 psi | 85% | 2585 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,086 psi | 86% | 2582 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,110 psi | 76% | 2513 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,376 psi | 85% | 2526 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,363 psi | 88% | 2228 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 58,189 psi | 90% | 2592 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 2684 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 58,581 psi | 90% | 2543 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,914 psi | 89% | 2608 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 58,465 psi | 90% | 2631 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,217 psi | 88% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,971 psi | 88% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2487 fps | 96.5% |
| Somchem S321 | <<locked>> | 88% | 57,116 psi | 88% | 2602 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,115 psi | 86% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 57,479 psi | 88% | 2602 fps | 99.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,072 psi | 88% | 2621 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,263 psi | 63% | 2484 fps | 99.6% |
| Vihtavuori N120 | <<locked>> | 82% | 58,668 psi | 90% | 2425 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 57,087 psi | 88% | 2474 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 57,217 psi | 88% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 58,189 psi | 90% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,115 psi | 86% | 2543 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 2562 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,008 psi | 75% | 2530 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 90% | 56,405 psi | 87% | 2569 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 57,682 psi | 89% | 2585 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,993 psi | 74% | 2536 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,111 psi | 77% | 2523 fps | 99.8% |
| Winchester 748 | <<locked>> | 90% | 55,709 psi | 86% | 2612 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,299 psi | 77% | 2589 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 94% | 58,276 psi | 90% | 2641 fps | 100% |
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% | 41,814 psi | 64% | 2310 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,925 psi | 83% | 2562 fps | 99.4% |
| Accurate 2460 | <<locked>> | 80% | 45,368 psi | 70% | 2402 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,026 psi | 52% | 2228 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,814 psi | 63% | 2365 fps | 99.9% |
| Accurate 2700 | <<locked>> | 92% | 51,866 psi | 80% | 2480 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 32,213 psi | 50% | 2215 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 34,911 psi | 54% | 2329 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 50,502 psi | 78% | 2382 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,894 psi | 78% | 2405 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,551 psi | 59% | 2323 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 32,808 psi | 50% | 2188 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 50,705 psi | 78% | 2487 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,611 psi | 62% | 2336 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 39,668 psi | 61% | 2333 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,137 psi | 73% | 2516 fps | 99.5% |
| Alliant Power Pro 2000-MR | 50.4 gr | 80% | 34,722 psi | 53% | 2329 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,778 psi | 49% | 2201 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,543 psi | 73% | 2398 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,389 psi | 53% | 2260 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,303 psi | 56% | 2349 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,357 psi | 48% | 2260 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,559 psi | 76% | 2385 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,463 psi | 58% | 2323 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 30,922 psi | 48% | 2198 fps | 96.5% |
| Bofors RP7 | <<locked>> | 98% | 51,082 psi | 79% | 2510 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,728 psi | 66% | 2333 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,696 psi | 60% | 2349 fps | 99.2% |
| Hodgdon CFE223 | 51.5 gr | 80% | 42,467 psi | 65% | 2470 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 46,369 psi | 71% | 2428 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,021 psi | 72% | 2451 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,709 psi | 56% | 2300 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 98% | 46,847 psi | 72% | 2533 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 98% | 51,822 psi | 80% | 2559 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,812 psi | 60% | 2333 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,951 psi | 48% | 2201 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,722 psi | 53% | 2300 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,599 psi | 39% | 1355 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,362 psi | 57% | 2290 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 37,869 psi | 58% | 2336 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,374 psi | 53% | 2218 fps | 95.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,659 psi | 73% | 2428 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,399 psi | 74% | 2365 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,021 psi | 72% | 2448 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 34,011 psi | 52% | 2290 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 35,186 psi | 54% | 2287 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 40,611 psi | 62% | 2336 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 45,208 psi | 70% | 2408 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 36,709 psi | 56% | 2303 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 39,276 psi | 60% | 2274 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 33,939 psi | 52% | 2221 fps | 97.7% |
| Lovex S065 | <<locked>> | 92% | 40,364 psi | 62% | 2346 fps | 95.3% |
| Lovex S070 | <<locked>> | 98% | 46,021 psi | 71% | 2464 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 53,577 psi | 82% | 2454 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,695 psi | 58% | 2283 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 37,753 psi | 58% | 2293 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,794 psi | 52% | 2251 fps | 96.3% |
| Norma URP | <<locked>> | 92% | 35,882 psi | 55% | 2336 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 33,272 psi | 51% | 2257 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 98% | 42,888 psi | 66% | 2470 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 40,466 psi | 62% | 2333 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,523 psi | 61% | 2352 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,034 psi | 68% | 2379 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 40% | 1388 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,585 psi | 70% | 2411 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,815 psi | 66% | 2388 fps | 95.1% |
| ReloadSwiss RS 52 | 48.8 gr | 80% | 35,418 psi | 54% | 2339 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,283 psi | 45% | 2215 fps | 97.2% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,536 psi | 58% | 2398 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,234 psi | 63% | 2464 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 41,191 psi | 63% | 2323 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,766 psi | 55% | 2238 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 29,095 psi | 45% | 2149 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 98% | 51,082 psi | 79% | 2510 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,364 psi | 62% | 2346 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,709 psi | 56% | 2303 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 33,939 psi | 52% | 2221 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 98% | 46,021 psi | 71% | 2464 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,327 psi | 74% | 2431 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,346 psi | 84% | 2198 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,995 psi | 78% | 2500 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,430 psi | 50% | 2241 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,428 psi | 75% | 2415 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,203 psi | 59% | 2303 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,014 psi | 57% | 2293 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,378 psi | 61% | 2251 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,300 psi | 50% | 2129 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,672 psi | 70% | 2395 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 43,497 psi | 67% | 2408 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 38,914 psi | 60% | 2257 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,159 psi | 59% | 2306 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 30,313 psi | 47% | 2162 fps | 95.5% |
| Somchem S365 | <<locked>> | 88% | 27,963 psi | 43% | 2185 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 55,259 psi | 85% | 2388 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 44,759 psi | 69% | 2313 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,581 psi | 61% | 2251 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,766 psi | 53% | 2231 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,766 psi | 55% | 2238 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 28,718 psi | 44% | 2106 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 90% | 35,360 psi | 54% | 2290 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 40,480 psi | 62% | 2333 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 34,243 psi | 53% | 2224 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 36,898 psi | 57% | 2343 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,430 psi | 48% | 2178 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 39,523 psi | 61% | 2369 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 47,108 psi | 72% | 2536 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,289 psi | 56% | 2297 fps | 97.7% |
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 107 powders for .338 Weatherby RPM loaded with the .338 | 227gr | CutEdge MTAC. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,736 fps. Accurate 4350 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 227.0 gr projectile in 0.338" calls for a 1:11.5 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for .338 Weatherby RPM with the .338 | 227gr | CutEdge MTAC 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.