Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:300 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:1:12.0
Load data in caliber .338 Weatherby RPM with .338 | 300gr | Nosler Custom Competition bullet and 112 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 Superformance and Alliant Reloder-17.
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>> | 84% | 57,305 psi | 88% | 2133 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,130 psi | 86% | 2162 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,841 psi | 89% | 2218 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 58,581 psi | 90% | 2224 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,786 psi | 66% | 2123 fps | 98.5% |
| Accurate 4064 | <<locked>> | 90% | 56,159 psi | 86% | 2205 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,912 psi | 86% | 2293 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,405 psi | 87% | 2234 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,217 psi | 88% | 2234 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,618 psi | 78% | 2241 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,448 psi | 85% | 2192 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,463 psi | 87% | 2156 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,014 psi | 86% | 2343 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,493 psi | 88% | 2251 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,972 psi | 89% | 2270 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,753 psi | 87% | 2333 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,349 psi | 90% | 2362 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,516 psi | 76% | 2231 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 43,250 psi | 67% | 2185 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,843 psi | 63% | 2146 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,027 psi | 55% | 2077 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,513 psi | 70% | 2287 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,956 psi | 86% | 2254 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 58,233 psi | 90% | 2267 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 43,250 psi | 67% | 2185 fps | 96.4% |
| Bofors RP7 | <<locked>> | 96% | 58,059 psi | 89% | 2254 fps | 99.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,116 psi | 88% | 2172 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 58,334 psi | 90% | 2257 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,942 psi | 88% | 2303 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,376 psi | 85% | 2244 fps | 100% |
| Hodgdon H414 | <<locked>> | 98% | 58,581 psi | 90% | 2336 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 94% | 55,608 psi | 86% | 2260 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 86% | 57,029 psi | 88% | 2241 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2231 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,492 psi | 87% | 2274 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,288 psi | 85% | 2333 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 55% | 1309 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,972 psi | 89% | 2241 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,392 psi | 88% | 2215 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,768 psi | 87% | 2218 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,710 psi | 87% | 2215 fps | 99.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 58,218 psi | 90% | 2280 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,304 psi | 87% | 2238 fps | 99.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2283 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 55,985 psi | 86% | 2254 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 50,517 psi | 78% | 2188 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 84% | 55,448 psi | 85% | 2192 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,478 psi | 87% | 2211 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,840 psi | 86% | 2172 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,869 psi | 87% | 2215 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,811 psi | 86% | 2231 fps | 99.9% |
| Lovex S070 | <<locked>> | 98% | 56,753 psi | 87% | 2264 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 35,766 psi | 55% | 2011 fps | 97% |
| Norma 201 | <<locked>> | 88% | 58,479 psi | 90% | 2221 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,695 psi | 86% | 2182 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,203 psi | 88% | 2260 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,347 psi | 85% | 2283 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 45,397 psi | 70% | 2247 fps | 98.2% |
| Norma URPᴾ | <<locked>> | 100% | 58,378 psi | 90% | 2320 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 57,899 psi | 89% | 2287 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,898 psi | 88% | 2326 fps | 99.9% |
| Ramshot TAC | <<locked>> | 84% | 55,274 psi | 85% | 2218 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,187 psi | 85% | 2228 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,883 psi | 86% | 2195 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 56% | 1345 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 58,450 psi | 90% | 2208 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,506 psi | 85% | 2231 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,332 psi | 85% | 2290 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 58,059 psi | 89% | 2356 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,361 psi | 85% | 2313 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 2382 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 56,159 psi | 86% | 2162 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,535 psi | 85% | 2185 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 58,117 psi | 89% | 2260 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 2218 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,327 psi | 74% | 2218 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 96% | 58,059 psi | 89% | 2254 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,811 psi | 86% | 2231 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,478 psi | 87% | 2211 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,869 psi | 87% | 2215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,753 psi | 87% | 2264 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,028 psi | 86% | 2274 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,711 psi | 89% | 2244 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 58,233 psi | 90% | 2254 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,681 psi | 87% | 2129 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,652 psi | 87% | 2129 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,057 psi | 86% | 2198 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,863 psi | 74% | 2215 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 56,376 psi | 87% | 2218 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,811 psi | 86% | 2129 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,058 psi | 88% | 2228 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 58,160 psi | 89% | 2257 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 53,853 psi | 83% | 2211 fps | 96.1% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,765 psi | 81% | 2280 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,936 psi | 75% | 2201 fps | 98.3% |
| Vihtavuori N130 | <<locked>> | 82% | 56,463 psi | 87% | 2093 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,985 psi | 88% | 2113 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,492 psi | 85% | 2149 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,333 psi | 87% | 2169 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,188 psi | 86% | 2201 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,377 psi | 88% | 2277 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 42,264 psi | 65% | 2096 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 84% | 55,869 psi | 86% | 2188 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,667 psi | 89% | 2205 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,289 psi | 87% | 2287 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,005 psi | 69% | 2205 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,159 psi | 88% | 2254 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,985 psi | 86% | 2231 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,042 psi | 85% | 2297 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,448 psi | 56% | 2175 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 88% | 58,349 psi | 90% | 2260 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 45,963 psi | 71% | 2152 fps | 96.6% |
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% | 50,923 psi | 78% | 2067 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,743 psi | 67% | 2021 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,836 psi | 78% | 2142 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,569 psi | 65% | 2018 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 30,618 psi | 47% | 1916 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,379 psi | 64% | 2028 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,342 psi | 47% | 1913 fps | 97% |
| ADI AR 2206H | <<locked>> | 80% | 46,789 psi | 72% | 2116 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 39,842 psi | 61% | 2005 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 94% | 41,989 psi | 65% | 2113 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,834 psi | 75% | 2113 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,850 psi | 77% | 2087 fps | 100% |
| Alliant Power Pro 2000-MR | 47.6 gr | 80% | 42,815 psi | 66% | 2162 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,711 psi | 61% | 2024 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,438 psi | 65% | 2073 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,951 psi | 48% | 1926 fps | 97.3% |
| Alliant Reloder-17 | 46.8 gr | 80% | 34,200 psi | 53% | 2021 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 94% | 41,292 psi | 64% | 2106 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 40,698 psi | 63% | 2142 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 23,844 psi | 37% | 1781 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 31,966 psi | 49% | 1988 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 86% | 28,340 psi | 44% | 1949 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,948 psi | 71% | 2126 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 39,378 psi | 61% | 2031 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 40,698 psi | 63% | 2142 fps | 95.6% |
| Bofors RP7 | <<locked>> | 82% | 37,797 psi | 58% | 1972 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,705 psi | 78% | 2100 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,066 psi | 74% | 2142 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,156 psi | 82% | 2260 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,132 psi | 62% | 2037 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 34,983 psi | 54% | 1995 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 38,290 psi | 59% | 2011 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,224 psi | 73% | 2123 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,384 psi | 44% | 1847 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,308 psi | 67% | 2110 fps | 100% |
| Hodgdon Superformance | 52 gr | 84% | 36,492 psi | 56% | 2047 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 41% | 1165 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,353 psi | 70% | 2087 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 47,282 psi | 73% | 2106 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,872 psi | 64% | 2028 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,353 psi | 68% | 2051 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 35,578 psi | 55% | 1955 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 36,941 psi | 57% | 1955 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 29,718 psi | 46% | 1883 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 43,497 psi | 67% | 2096 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 47,500 psi | 73% | 2146 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 48,834 psi | 75% | 2113 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,296 psi | 71% | 2096 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,601 psi | 72% | 2057 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 41,872 psi | 64% | 2028 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,548 psi | 53% | 1919 fps | 96.8% |
| Lovex S070 | <<locked>> | 82% | 34,853 psi | 54% | 1942 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 31,546 psi | 49% | 1932 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 46,035 psi | 71% | 2077 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,282 psi | 71% | 2073 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,843 psi | 64% | 2064 fps | 99.9% |
| Norma 204 | <<locked>> | 90% | 42,540 psi | 65% | 2106 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 35,070 psi | 54% | 2064 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 30,922 psi | 48% | 1916 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 41,582 psi | 64% | 2083 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 32,155 psi | 49% | 1949 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 48,617 psi | 75% | 2133 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,385 psi | 74% | 2146 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,736 psi | 81% | 2156 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,093 psi | 42% | 1194 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,708 psi | 84% | 2169 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,364 psi | 62% | 2021 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,078 psi | 69% | 2159 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,390 psi | 56% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,182 psi | 46% | 1929 fps | 96.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 30,240 psi | 47% | 1929 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 50,024 psi | 77% | 2093 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,714 psi | 67% | 2037 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,275 psi | 57% | 1991 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 96% | 46,180 psi | 71% | 2133 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 39,914 psi | 61% | 2090 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 37,797 psi | 58% | 1972 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,548 psi | 53% | 1919 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,296 psi | 71% | 2096 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,872 psi | 64% | 2028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 34,853 psi | 54% | 1942 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,029 psi | 59% | 2031 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,210 psi | 73% | 2116 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,324 psi | 70% | 2096 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,195 psi | 73% | 2024 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,436 psi | 61% | 1926 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 33,475 psi | 51% | 1873 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 39,566 psi | 61% | 2087 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 52,794 psi | 81% | 2178 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,891 psi | 72% | 2028 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,818 psi | 72% | 2106 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 37,985 psi | 58% | 1991 fps | 99.8% |
| Somchem S361 | <<locked>> | 98% | 50,691 psi | 78% | 2175 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 27,659 psi | 43% | 1880 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 35,578 psi | 55% | 1995 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 53,127 psi | 82% | 2057 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,601 psi | 73% | 2011 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,468 psi | 67% | 2011 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,019 psi | 68% | 2028 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,172 psi | 56% | 1942 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 32,068 psi | 49% | 1913 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 37,347 psi | 57% | 2014 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 49,037 psi | 75% | 2110 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,177 psi | 65% | 2024 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,604 psi | 49% | 1916 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 25,367 psi | 39% | 1837 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,691 psi | 49% | 1893 fps | 98.9% |
| Winchester 748 | <<locked>> | 80% | 48,892 psi | 75% | 2149 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 34,983 psi | 54% | 1995 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 23,627 psi | 36% | 1837 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,918 psi | 69% | 2103 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 40,190 psi | 62% | 2064 fps | 95% |
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 125 powders for .338 Weatherby RPM loaded with the .338 | 300gr | Nosler Custom Competition. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,382 fps; across all powders the maximum-charge window runs from 1,309 fps to 2,382 fps. Accurate 3100 gives the best case fill at 100 %, and 125 of the 125 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 300.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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 Superformance, Alliant Reloder-17 rank at the top here: for .338 Weatherby RPM with the .338 | 300gr | Nosler Custom Competition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.