Load Specifications
Bullet:.338 | 250gr | Hornady BTHP
Bullet Manufacturer:Hornady
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:1:12.5
Load data in caliber .338 RCM with .338 | 250gr | Hornady BTHP bullet and 104 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 Ramshot Big Game.
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% | 55,230 psi | 89% | 2297 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,651 psi | 89% | 2385 fps | 99.5% |
| Accurate 2460 | <<locked>> | 86% | 53,519 psi | 86% | 2323 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,709 psi | 89% | 2352 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,100 psi | 88% | 2375 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 53,301 psi | 85% | 2306 fps | 95.8% |
| Accurate 4064 | <<locked>> | 98% | 55,216 psi | 89% | 2388 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,874 psi | 70% | 2313 fps | 97.9% |
| Accurate LT-30 | <<locked>> | 84% | 55,463 psi | 89% | 2251 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,869 psi | 90% | 2274 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,085 psi | 87% | 2382 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 98% | 54,955 psi | 88% | 2375 fps | 99.5% |
| ADI AR 2219 | <<locked>> | 84% | 55,651 psi | 89% | 2356 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,577 psi | 86% | 2343 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 53,011 psi | 85% | 2323 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,201 psi | 89% | 2431 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,171 psi | 85% | 2474 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,867 psi | 86% | 2392 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,274 psi | 89% | 2303 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,810 psi | 88% | 2411 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,237 psi | 71% | 2316 fps | 98% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,749 psi | 81% | 2448 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,317 psi | 87% | 2254 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,766 psi | 86% | 2398 fps | 99.3% |
| Bofors RP3 | <<locked>> | 98% | 54,244 psi | 87% | 2408 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2329 fps | 95.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,869 psi | 90% | 2329 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,680 psi | 89% | 2415 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,722 psi | 86% | 2451 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 86% | 54,259 psi | 87% | 2339 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,477 psi | 89% | 2369 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,869 psi | 90% | 2418 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 47,674 psi | 76% | 2356 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 92% | 54,520 psi | 87% | 2392 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,437 psi | 65% | 2221 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 52,707 psi | 85% | 2415 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 56% | 1385 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,130 psi | 90% | 2395 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 53,519 psi | 86% | 2372 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,433 psi | 87% | 2362 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,477 psi | 89% | 2346 fps | 97.1% |
| IMR 4198 | <<locked>> | 86% | 55,869 psi | 90% | 2267 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2362 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,989 psi | 67% | 2267 fps | 97.5% |
| IMR 4895 | <<locked>> | 96% | 56,130 psi | 90% | 2438 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 53,577 psi | 86% | 2343 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 53,417 psi | 86% | 2333 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 52,794 psi | 85% | 2359 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,433 psi | 87% | 2320 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 53,708 psi | 86% | 2359 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2313 fps | 97.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 46,804 psi | 75% | 2290 fps | 95.8% |
| Norma 200 | <<locked>> | 82% | 55,129 psi | 88% | 2277 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,260 psi | 90% | 2375 fps | 100% |
| Norma 202 | <<locked>> | 94% | 56,376 psi | 90% | 2375 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,911 psi | 86% | 2402 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 44,150 psi | 71% | 2310 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 96% | 54,273 psi | 87% | 2428 fps | 99.8% |
| Ramshot TAC | <<locked>> | 90% | 54,099 psi | 87% | 2359 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 52,895 psi | 85% | 2375 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,955 psi | 88% | 2349 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,925 psi | 56% | 1417 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,287 psi | 85% | 2329 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,185 psi | 85% | 2356 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,795 psi | 88% | 2470 fps | 99.7% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,201 psi | 87% | 2497 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,758 psi | 70% | 2329 fps | 97.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,237 psi | 73% | 2346 fps | 96.9% |
| Rottweil R 901 | <<locked>> | 90% | 54,070 psi | 87% | 2320 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,200 psi | 85% | 2329 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,809 psi | 86% | 2395 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2329 fps | 95.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2313 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 52,794 psi | 85% | 2359 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,708 psi | 86% | 2359 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 46,804 psi | 75% | 2290 fps | 95.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,171 psi | 85% | 2303 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,101 psi | 90% | 2034 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,173 psi | 90% | 2372 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,767 psi | 89% | 2451 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,318 psi | 90% | 2320 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,477 psi | 89% | 2382 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,898 psi | 90% | 2402 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,347 psi | 89% | 2287 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,694 psi | 88% | 2283 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 49,748 psi | 80% | 2270 fps | 96% |
| Somchem S321 | <<locked>> | 88% | 54,694 psi | 88% | 2379 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,099 psi | 87% | 2287 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,969 psi | 88% | 2379 fps | 99.8% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 2395 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,334 psi | 63% | 2267 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 88% | 55,332 psi | 89% | 2260 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,187 psi | 88% | 2274 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,477 psi | 89% | 2339 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,563 psi | 86% | 2320 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,707 psi | 85% | 2339 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,731 psi | 75% | 2310 fps | 98.1% |
| Vihtavuori N530 | <<locked>> | 90% | 54,128 psi | 87% | 2343 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,071 psi | 88% | 2362 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,571 psi | 73% | 2316 fps | 97.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,761 psi | 77% | 2300 fps | 99.6% |
| Winchester 748 | <<locked>> | 90% | 52,895 psi | 85% | 2382 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 47,674 psi | 76% | 2356 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,390 psi | 89% | 2408 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% | 40,785 psi | 65% | 2116 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,880 psi | 83% | 2336 fps | 99.2% |
| Accurate 2460 | <<locked>> | 80% | 44,150 psi | 71% | 2201 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,069 psi | 53% | 2044 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,175 psi | 63% | 2162 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 49,835 psi | 80% | 2260 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 31,270 psi | 50% | 2031 fps | 99.3% |
| Accurate 4350 | <<locked>> | 94% | 35,563 psi | 57% | 2172 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 49,008 psi | 79% | 2175 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,400 psi | 79% | 2195 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,246 psi | 60% | 2123 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 33,823 psi | 54% | 2044 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 48,994 psi | 79% | 2277 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,233 psi | 63% | 2133 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 38,159 psi | 61% | 2133 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,281 psi | 73% | 2293 fps | 99.4% |
| Alliant Power Pro 2000-MR | 44.3 gr | 82% | 35,897 psi | 58% | 2178 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,806 psi | 49% | 2018 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,006 psi | 74% | 2192 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,214 psi | 53% | 2067 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 34,969 psi | 56% | 2142 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 30,269 psi | 49% | 2067 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,819 psi | 77% | 2178 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,071 psi | 58% | 2119 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 30,023 psi | 48% | 2018 fps | 96.4% |
| Bofors RP7 | <<locked>> | 98% | 48,834 psi | 78% | 2287 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,394 psi | 66% | 2129 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,246 psi | 60% | 2149 fps | 99% |
| Hodgdon CFE223 | 44.2 gr | 80% | 40,843 psi | 65% | 2257 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 44,788 psi | 72% | 2221 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,295 psi | 73% | 2241 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 37,884 psi | 61% | 2149 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 44,585 psi | 71% | 2310 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 37,492 psi | 60% | 2133 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 29,892 psi | 48% | 2011 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,417 psi | 54% | 2103 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,831 psi | 41% | 1237 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,187 psi | 58% | 2096 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 36,477 psi | 58% | 2139 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,272 psi | 53% | 2024 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 46,050 psi | 74% | 2215 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 46,775 psi | 75% | 2159 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 48,153 psi | 77% | 2277 fps | 95.6% |
| IMR 4831 | <<locked>> | 94% | 34,780 psi | 56% | 2139 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 33,968 psi | 54% | 2090 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 80% | 39,233 psi | 63% | 2133 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 43,801 psi | 70% | 2205 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 35,578 psi | 57% | 2110 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 38,116 psi | 61% | 2077 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 32,953 psi | 53% | 2034 fps | 97.6% |
| Lovex S065 | <<locked>> | 94% | 41,394 psi | 66% | 2185 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 44,048 psi | 71% | 2247 fps | 95% |
| Norma 200 | <<locked>> | 80% | 51,851 psi | 83% | 2241 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,506 psi | 59% | 2087 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 36,680 psi | 59% | 2103 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 32,619 psi | 52% | 2057 fps | 96.1% |
| Norma URP | <<locked>> | 94% | 36,651 psi | 59% | 2178 fps | 95.7% |
| Ramshot Big Game | 43.2 gr | 80% | 32,184 psi | 52% | 2064 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 39,117 psi | 63% | 2133 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,072 psi | 61% | 2149 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,641 psi | 68% | 2175 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,875 psi | 41% | 1263 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,034 psi | 71% | 2205 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 43,845 psi | 70% | 2224 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 34,272 psi | 55% | 2142 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,456 psi | 46% | 2028 fps | 97% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 35,897 psi | 58% | 2192 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 39,552 psi | 63% | 2244 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 40,364 psi | 65% | 2129 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 34,911 psi | 56% | 2051 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 28,239 psi | 45% | 1969 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 98% | 48,834 psi | 78% | 2287 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,394 psi | 66% | 2185 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,578 psi | 57% | 2110 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 32,953 psi | 53% | 2034 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 44,048 psi | 71% | 2247 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,615 psi | 75% | 2218 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,388 psi | 86% | 2008 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,211 psi | 79% | 2283 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 31,488 psi | 50% | 2054 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,775 psi | 75% | 2205 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 37,043 psi | 59% | 2106 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,940 psi | 58% | 2100 fps | 97% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,290 psi | 61% | 2057 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,357 psi | 50% | 1949 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 46,543 psi | 75% | 2228 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 41,916 psi | 67% | 2201 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 37,710 psi | 60% | 2060 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 36,666 psi | 59% | 2110 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 29,327 psi | 47% | 1978 fps | 95.4% |
| Somchem S365 | <<locked>> | 88% | 27,108 psi | 43% | 1998 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 43,439 psi | 70% | 2116 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,377 psi | 62% | 2057 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,649 psi | 54% | 2044 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,606 psi | 55% | 2047 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 27,847 psi | 45% | 1932 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 92% | 36,230 psi | 58% | 2136 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 39,204 psi | 63% | 2133 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 33,156 psi | 53% | 2037 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 35,215 psi | 56% | 2139 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 30,501 psi | 49% | 1991 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,884 psi | 61% | 2165 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 44,817 psi | 72% | 2313 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,795 psi | 56% | 2096 fps | 97.4% |
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 104 powders for .338 RCM loaded with the .338 | 250gr | Hornady BTHP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,497 fps; across all powders the maximum-charge window runs from 1,385 fps to 2,497 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 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 1:12.5 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, Ramshot Big Game rank at the top here: for .338 RCM with the .338 | 250gr | Hornady BTHP 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.