Load Specifications
Bullet Manufacturer:Rhino Bullets
Bullet Weight:250 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:1:13.0
Load data in caliber .338 RCM with .338 | 250gr | Rhino Penetrator bullet and 100 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% | 55,071 psi | 88% | 2293 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,143 psi | 88% | 2375 fps | 99.5% |
| Accurate 2230 | <<locked>> | 82% | 56,101 psi | 90% | 2388 fps | 99.7% |
| Accurate 2460 | <<locked>> | 86% | 53,359 psi | 86% | 2316 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,230 psi | 89% | 2346 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,650 psi | 88% | 2369 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 54,752 psi | 88% | 2382 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,468 psi | 70% | 2303 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 84% | 55,303 psi | 89% | 2247 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,753 psi | 89% | 2267 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,940 psi | 86% | 2375 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 98% | 54,534 psi | 87% | 2369 fps | 99.5% |
| ADI AR 2219 | <<locked>> | 84% | 55,477 psi | 89% | 2352 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,447 psi | 86% | 2339 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 56,130 psi | 90% | 2352 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,665 psi | 88% | 2421 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,156 psi | 85% | 2470 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,751 psi | 86% | 2388 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,085 psi | 88% | 2297 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,708 psi | 88% | 2408 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,164 psi | 71% | 2313 fps | 97.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,734 psi | 81% | 2441 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,882 psi | 86% | 2247 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,330 psi | 86% | 2388 fps | 99.2% |
| Bofors RP3 | <<locked>> | 98% | 53,795 psi | 86% | 2398 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2323 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,738 psi | 89% | 2326 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,288 psi | 89% | 2408 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,229 psi | 85% | 2441 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 86% | 54,070 psi | 87% | 2336 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,027 psi | 88% | 2359 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,811 psi | 89% | 2411 fps | 99% |
| Hodgdon H4895 | <<locked>> | 92% | 54,404 psi | 87% | 2385 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,132 psi | 64% | 2215 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,985 psi | 90% | 2451 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,664 psi | 56% | 1381 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,680 psi | 89% | 2385 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 53,388 psi | 86% | 2369 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,375 psi | 87% | 2356 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,071 psi | 88% | 2336 fps | 97% |
| IMR 4198 | <<locked>> | 86% | 55,695 psi | 89% | 2260 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,896 psi | 86% | 2352 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,916 psi | 67% | 2264 fps | 97.4% |
| IMR 4895 | <<locked>> | 96% | 56,101 psi | 90% | 2434 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 53,447 psi | 86% | 2339 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 53,316 psi | 85% | 2329 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 56,159 psi | 90% | 2395 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,346 psi | 87% | 2316 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 53,650 psi | 86% | 2356 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2303 fps | 97.4% |
| Norma 200 | <<locked>> | 82% | 54,911 psi | 88% | 2274 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,811 psi | 89% | 2369 fps | 100% |
| Norma 202 | <<locked>> | 94% | 56,260 psi | 90% | 2372 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,795 psi | 86% | 2395 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 43,830 psi | 70% | 2300 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 96% | 53,867 psi | 86% | 2418 fps | 99.7% |
| Ramshot TAC | <<locked>> | 90% | 53,722 psi | 86% | 2352 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 92% | 56,101 psi | 90% | 2411 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,534 psi | 87% | 2339 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,867 psi | 56% | 1414 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,142 psi | 85% | 2326 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 52,866 psi | 85% | 2349 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,317 psi | 87% | 2461 fps | 99.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2493 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,424 psi | 70% | 2323 fps | 97.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,947 psi | 72% | 2339 fps | 96.8% |
| Rottweil R 901 | <<locked>> | 90% | 53,925 psi | 86% | 2316 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,057 psi | 90% | 2362 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,330 psi | 86% | 2385 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2323 fps | 95.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2303 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 94% | 56,159 psi | 90% | 2395 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,650 psi | 86% | 2356 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,055 psi | 85% | 2300 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,854 psi | 90% | 2031 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,753 psi | 89% | 2362 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2441 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,130 psi | 90% | 2313 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,056 psi | 88% | 2372 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,492 psi | 89% | 2392 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,897 psi | 88% | 2280 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,273 psi | 87% | 2277 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 49,356 psi | 79% | 2260 fps | 95.9% |
| Somchem S321 | <<locked>> | 88% | 54,288 psi | 87% | 2369 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,027 psi | 87% | 2283 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,607 psi | 88% | 2369 fps | 99.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,288 psi | 87% | 2388 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,059 psi | 63% | 2260 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 88% | 54,853 psi | 88% | 2251 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,737 psi | 88% | 2267 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,013 psi | 88% | 2333 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,476 psi | 86% | 2316 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2329 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,412 psi | 74% | 2303 fps | 98% |
| Vihtavuori N530 | <<locked>> | 90% | 53,650 psi | 86% | 2336 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 54,665 psi | 88% | 2352 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,281 psi | 73% | 2306 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,485 psi | 76% | 2293 fps | 99.5% |
| Winchester 748 | <<locked>> | 92% | 56,202 psi | 90% | 2418 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,940 psi | 88% | 2402 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% | 40,625 psi | 65% | 2110 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,750 psi | 83% | 2329 fps | 99.2% |
| Accurate 2230 | <<locked>> | 80% | 52,301 psi | 84% | 2339 fps | 99.4% |
| Accurate 2460 | <<locked>> | 80% | 43,729 psi | 70% | 2192 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,866 psi | 53% | 2037 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,015 psi | 63% | 2156 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 31,140 psi | 50% | 2024 fps | 99.3% |
| Accurate 4350 | <<locked>> | 94% | 35,418 psi | 57% | 2169 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 48,863 psi | 78% | 2172 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,255 psi | 79% | 2188 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,101 psi | 59% | 2116 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 33,707 psi | 54% | 2037 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 48,515 psi | 78% | 2267 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,088 psi | 63% | 2129 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 37,927 psi | 61% | 2129 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,063 psi | 72% | 2287 fps | 99.4% |
| Alliant Power Pro 2000-MR | 44 gr | 82% | 35,592 psi | 57% | 2169 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,676 psi | 49% | 2014 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,818 psi | 73% | 2185 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,069 psi | 53% | 2060 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 36,825 psi | 59% | 2175 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 30,182 psi | 48% | 2060 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,732 psi | 77% | 2175 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,940 psi | 58% | 2116 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 29,660 psi | 48% | 2008 fps | 96.2% |
| Bofors RP7 | <<locked>> | 98% | 48,762 psi | 78% | 2280 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,263 psi | 66% | 2126 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,869 psi | 59% | 2142 fps | 98.9% |
| Hodgdon CFE223 | 43.9 gr | 80% | 40,480 psi | 65% | 2247 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 44,643 psi | 72% | 2215 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,165 psi | 72% | 2234 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 37,739 psi | 61% | 2146 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 37,318 psi | 60% | 2126 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 29,776 psi | 48% | 2005 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,286 psi | 53% | 2096 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,744 psi | 41% | 1234 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,071 psi | 58% | 2090 fps | 97.5% |
| IMR 3031 | <<locked>> | 80% | 36,303 psi | 58% | 2133 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,141 psi | 53% | 2021 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,963 psi | 74% | 2211 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 46,557 psi | 75% | 2152 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 47,790 psi | 77% | 2267 fps | 95.4% |
| IMR 4831 | <<locked>> | 94% | 34,679 psi | 56% | 2133 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 33,794 psi | 54% | 2087 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 39,088 psi | 63% | 2129 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 43,366 psi | 70% | 2195 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 35,186 psi | 56% | 2100 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 37,985 psi | 61% | 2070 fps | 97.5% |
| Lovex S062 | <<locked>> | 80% | 32,808 psi | 53% | 2028 fps | 97.5% |
| Lovex S065 | <<locked>> | 94% | 41,017 psi | 66% | 2178 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 51,619 psi | 83% | 2234 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,376 psi | 58% | 2080 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 36,506 psi | 59% | 2096 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 32,503 psi | 52% | 2051 fps | 96% |
| Norma URP | <<locked>> | 94% | 36,550 psi | 59% | 2172 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 31,879 psi | 51% | 2054 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 39,001 psi | 63% | 2126 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,956 psi | 61% | 2146 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,264 psi | 68% | 2169 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,788 psi | 41% | 1260 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,859 psi | 70% | 2201 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 43,743 psi | 70% | 2218 fps | 95.3% |
| ReloadSwiss RS 52 | 41.6 gr | 80% | 33,895 psi | 54% | 2133 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,340 psi | 45% | 2021 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 35,621 psi | 57% | 2182 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,003 psi | 67% | 2287 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 40,219 psi | 64% | 2123 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 34,780 psi | 56% | 2044 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 28,123 psi | 45% | 1965 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 98% | 48,762 psi | 78% | 2280 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,017 psi | 66% | 2178 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,186 psi | 56% | 2100 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 32,808 psi | 53% | 2028 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,209 psi | 74% | 2211 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,142 psi | 85% | 2001 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,052 psi | 79% | 2280 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 31,372 psi | 50% | 2047 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,586 psi | 75% | 2198 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 36,680 psi | 59% | 2096 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,578 psi | 57% | 2090 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,145 psi | 61% | 2051 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,227 psi | 50% | 1946 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 46,180 psi | 74% | 2221 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 41,756 psi | 67% | 2195 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 37,521 psi | 60% | 2057 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 36,564 psi | 59% | 2103 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 29,211 psi | 47% | 1972 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 27,006 psi | 43% | 1995 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 43,279 psi | 69% | 2110 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,218 psi | 61% | 2054 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,417 psi | 54% | 2037 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,461 psi | 55% | 2044 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 27,731 psi | 44% | 1926 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 36,129 psi | 58% | 2129 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 38,841 psi | 62% | 2123 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 32,996 psi | 53% | 2034 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 94% | 37,347 psi | 60% | 2175 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 30,284 psi | 49% | 1985 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 37,739 psi | 61% | 2159 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,650 psi | 56% | 2093 fps | 97.3% |
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 100 powders for .338 RCM loaded with the .338 | 250gr | Rhino Penetrator. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,493 fps; across all powders the maximum-charge window runs from 1,381 fps to 2,493 fps. Accurate 4350 gives the best case fill at 100 %, and 100 of the 100 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 250.0 gr projectile in 0.338" calls for a 1:13.0 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, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .338 RCM with the .338 | 250gr | Rhino Penetrator 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.