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:1:15.0
Load data in caliber .338 RCM with .338 | 250gr | Rhino Solid Shank bullet and 106 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 ReloadSwiss RS 60.
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>> | 88% | 54,708 psi | 88% | 2313 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 52,866 psi | 85% | 2336 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,288 psi | 89% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 56,202 psi | 90% | 2421 fps | 100% |
| Accurate 2700 | <<locked>> | 96% | 53,243 psi | 85% | 2326 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 55,114 psi | 88% | 2408 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,891 psi | 75% | 2379 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 82% | 54,273 psi | 87% | 2260 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,694 psi | 88% | 2283 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 53,519 psi | 86% | 2398 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 54,346 psi | 87% | 2395 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 54,723 psi | 88% | 2365 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,231 psi | 90% | 2398 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 56,188 psi | 90% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 54,491 psi | 87% | 2448 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 56,231 psi | 90% | 2543 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 53,766 psi | 86% | 2415 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,389 psi | 87% | 2313 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 54,375 psi | 87% | 2431 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,659 psi | 75% | 2385 fps | 98.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2516 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,083 psi | 53% | 2162 fps | 96.7% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,330 psi | 86% | 2267 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,113 psi | 85% | 2411 fps | 99.4% |
| Bofors RP3 | <<locked>> | 96% | 54,070 psi | 87% | 2428 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2392 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,955 psi | 88% | 2343 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,882 psi | 88% | 2428 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,171 psi | 85% | 2467 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 53,417 psi | 86% | 2352 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,578 psi | 88% | 2379 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,434 psi | 89% | 2438 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 50,444 psi | 81% | 2425 fps | 96.9% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2441 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 90% | 53,998 psi | 87% | 2408 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,917 psi | 69% | 2287 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 56,144 psi | 90% | 2480 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2454 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,882 psi | 56% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,332 psi | 89% | 2408 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 53,417 psi | 86% | 2392 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,056 psi | 87% | 2382 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,447 psi | 87% | 2362 fps | 97.4% |
| IMR 4198 | <<locked>> | 84% | 55,100 psi | 88% | 2277 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 53,447 psi | 86% | 2379 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,933 psi | 72% | 2333 fps | 98.4% |
| IMR 4895 | <<locked>> | 94% | 55,709 psi | 89% | 2457 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 56,231 psi | 90% | 2398 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 52,939 psi | 85% | 2349 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 56,202 psi | 90% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,766 psi | 86% | 2336 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 53,476 psi | 86% | 2379 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2372 fps | 98.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,719 psi | 80% | 2356 fps | 96.9% |
| Norma 201 | <<locked>> | 92% | 55,608 psi | 89% | 2392 fps | 100% |
| Norma 202 | <<locked>> | 92% | 56,130 psi | 90% | 2395 fps | 100% |
| Norma 203B | <<locked>> | 94% | 53,519 psi | 86% | 2421 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 47,036 psi | 75% | 2375 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 94% | 53,838 psi | 86% | 2444 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,267 psi | 74% | 2369 fps | 96.8% |
| Ramshot TAC | <<locked>> | 88% | 53,142 psi | 85% | 2375 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,883 psi | 90% | 2434 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,085 psi | 87% | 2365 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,375 psi | 57% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 56,101 psi | 90% | 2385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 56,202 psi | 90% | 2421 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 54,534 psi | 87% | 2490 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,766 psi | 86% | 2516 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,673 psi | 75% | 2398 fps | 98.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,674 psi | 76% | 2418 fps | 98% |
| Rottweil R 901 | <<locked>> | 88% | 53,635 psi | 86% | 2336 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,869 psi | 90% | 2385 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 53,592 psi | 86% | 2415 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2392 fps | 96.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2372 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 56,202 psi | 90% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,476 psi | 86% | 2379 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,719 psi | 80% | 2356 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,782 psi | 89% | 2362 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,085 psi | 88% | 2379 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,564 psi | 89% | 2470 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,361 psi | 89% | 2329 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,766 psi | 88% | 2398 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,288 psi | 89% | 2418 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,520 psi | 87% | 2300 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,896 psi | 86% | 2297 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,895 psi | 85% | 2336 fps | 97.1% |
| Somchem S321 | <<locked>> | 86% | 54,027 psi | 87% | 2392 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 53,330 psi | 86% | 2300 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,331 psi | 87% | 2392 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 54,186 psi | 87% | 2415 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,684 psi | 67% | 2329 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 54,520 psi | 87% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,491 psi | 87% | 2287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,172 psi | 88% | 2356 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 52,982 psi | 85% | 2336 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2398 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,356 psi | 79% | 2372 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 88% | 53,185 psi | 85% | 2356 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 54,404 psi | 87% | 2375 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2379 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,954 psi | 56% | 2224 fps | 96.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,444 psi | 81% | 2362 fps | 99.9% |
| Winchester 748 | <<locked>> | 90% | 55,883 psi | 90% | 2441 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,763 psi | 81% | 2428 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,766 psi | 88% | 2425 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% | 42,801 psi | 69% | 2162 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,427 psi | 74% | 2254 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,230 psi | 56% | 2096 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,161 psi | 64% | 2205 fps | 99.9% |
| Accurate 2700 | <<locked>> | 94% | 49,937 psi | 80% | 2283 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 33,330 psi | 53% | 2087 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 33,359 psi | 53% | 2149 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 51,213 psi | 82% | 2224 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,590 psi | 83% | 2244 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,131 psi | 63% | 2178 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 33,504 psi | 54% | 2057 fps | 95.9% |
| ADI AR 2219 | <<locked>> | 80% | 51,213 psi | 82% | 2326 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,118 psi | 66% | 2188 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 40,654 psi | 65% | 2185 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,674 psi | 76% | 2352 fps | 99.8% |
| Alliant Power Pro 2000-MR | 45.5 gr | 80% | 35,230 psi | 56% | 2188 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,692 psi | 52% | 2077 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,240 psi | 77% | 2238 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,056 psi | 56% | 2123 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 34,577 psi | 55% | 2159 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,081 psi | 48% | 2083 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,111 psi | 50% | 2113 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,980 psi | 80% | 2224 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,014 psi | 61% | 2178 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 31,836 psi | 51% | 2073 fps | 97.4% |
| Bofors RP7 | <<locked>> | 96% | 48,588 psi | 78% | 2310 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,294 psi | 69% | 2182 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,262 psi | 63% | 2205 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,120 psi | 69% | 2320 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 80% | 47,050 psi | 75% | 2270 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,776 psi | 77% | 2293 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 35,230 psi | 56% | 2119 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 96% | 44,338 psi | 71% | 2329 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 96% | 49,066 psi | 79% | 2352 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,421 psi | 63% | 2188 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 29,733 psi | 48% | 2031 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,491 psi | 57% | 2165 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 98% | 48,327 psi | 77% | 2405 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,933 psi | 42% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,043 psi | 61% | 2149 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 38,595 psi | 62% | 2188 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,070 psi | 56% | 2083 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,368 psi | 73% | 2231 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 48,820 psi | 78% | 2205 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 44,788 psi | 72% | 2251 fps | 95.3% |
| IMR 4831 | <<locked>> | 90% | 32,677 psi | 52% | 2113 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 35,839 psi | 57% | 2149 fps | 97.5% |
| IMR 8208 XBR | <<locked>> | 80% | 41,118 psi | 66% | 2188 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 46,238 psi | 74% | 2260 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,797 psi | 61% | 2165 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 39,943 psi | 64% | 2133 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 34,824 psi | 56% | 2090 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 38,551 psi | 62% | 2159 fps | 95.3% |
| Lovex S070 | <<locked>> | 96% | 43,729 psi | 70% | 2267 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 38,479 psi | 62% | 2142 fps | 99% |
| Norma 202 | <<locked>> | 80% | 38,667 psi | 62% | 2156 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,418 psi | 55% | 2113 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 34,360 psi | 55% | 2152 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 33,837 psi | 54% | 2119 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 96% | 40,828 psi | 65% | 2277 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 41,089 psi | 66% | 2192 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,248 psi | 65% | 2208 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,498 psi | 71% | 2228 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,237 psi | 42% | 1286 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,296 psi | 74% | 2260 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 40,741 psi | 65% | 2195 fps | 95% |
| ReloadSwiss RS 52 | 44.1 gr | 80% | 36,129 psi | 58% | 2201 fps | 97% |
| ReloadSwiss RS 60 | 44.8 gr | 80% | 29,892 psi | 48% | 2090 fps | 98.1% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 35,752 psi | 57% | 2211 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 39,117 psi | 63% | 2267 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 42,322 psi | 68% | 2178 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,637 psi | 59% | 2103 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 30,037 psi | 48% | 2028 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 96% | 48,588 psi | 78% | 2310 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 38,551 psi | 62% | 2159 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,797 psi | 61% | 2165 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 34,824 psi | 56% | 2090 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 96% | 43,729 psi | 70% | 2267 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,718 psi | 78% | 2270 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,721 psi | 83% | 2339 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,053 psi | 50% | 2064 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,037 psi | 79% | 2254 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,160 psi | 63% | 2165 fps | 96.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,637 psi | 60% | 2152 fps | 97.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,089 psi | 64% | 2106 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,982 psi | 53% | 1998 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 43,018 psi | 69% | 2198 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 44,135 psi | 71% | 2257 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 39,566 psi | 63% | 2113 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,754 psi | 62% | 2165 fps | 98% |
| Somchem S355 | <<locked>> | 80% | 31,096 psi | 50% | 2034 fps | 96.5% |
| Somchem S365 | <<locked>> | 86% | 27,064 psi | 43% | 2018 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 45,426 psi | 73% | 2162 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,248 psi | 65% | 2106 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,636 psi | 57% | 2093 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,477 psi | 58% | 2100 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,501 psi | 47% | 1985 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 33,765 psi | 54% | 2106 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 41,104 psi | 66% | 2185 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 35,027 psi | 56% | 2093 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 35,070 psi | 56% | 2156 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 96% | 30,879 psi | 50% | 2133 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,081 psi | 48% | 2005 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 40,059 psi | 64% | 2221 fps | 99.7% |
| Winchester 760 | <<locked>> | 96% | 44,628 psi | 72% | 2336 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,927 psi | 59% | 2159 fps | 98.3% |
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 106 powders for .338 RCM loaded with the .338 | 250gr | Rhino Solid Shank. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,543 fps; across all powders the maximum-charge window runs from 1,407 fps to 2,543 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.0 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, ReloadSwiss RS 60 rank at the top here: for .338 RCM with the .338 | 250gr | Rhino Solid Shank 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.