Load Specifications
Load data in caliber .33 Win. with .338 | 250gr | Speer Grand Slam bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and SNPE Vectan SP 11.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 39,320 psi | 89% | 2051 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 38,348 psi | 87% | 2096 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 37,652 psi | 85% | 2093 fps | 99.3% |
| Accurate 4064 | <<locked>> | 90% | 38,406 psi | 87% | 2123 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 38,493 psi | 87% | 2096 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 90% | 39,291 psi | 89% | 2093 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 38,290 psi | 87% | 2070 fps | 98% |
| Alliant AR-Comp | <<locked>> | 84% | 38,885 psi | 88% | 2106 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 37,956 psi | 86% | 2113 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 88% | 38,638 psi | 87% | 2119 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 94% | 37,768 psi | 85% | 2172 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 39,798 psi | 90% | 2136 fps | 96% |
| Bofors RP3 | <<locked>> | 92% | 39,610 psi | 90% | 2156 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 84% | 38,203 psi | 86% | 2123 fps | 98.6% |
| Hodgdon CFE223 | <<locked>> | 82% | 39,537 psi | 89% | 2178 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 38,711 psi | 88% | 2106 fps | 97.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,608 psi | 83% | 2096 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 39,117 psi | 88% | 2162 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,156 psi | 77% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 39,885 psi | 90% | 2113 fps | 97.7% |
| IMR 3031 | <<locked>> | 86% | 39,755 psi | 90% | 2149 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 39,015 psi | 88% | 2083 fps | 96.5% |
| IMR 4895 | <<locked>> | 88% | 39,494 psi | 89% | 2146 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 82% | 38,290 psi | 87% | 2070 fps | 98% |
| Lovex D073.6 | <<locked>> | 86% | 38,754 psi | 88% | 2119 fps | 99.4% |
| Lovex S060 | <<locked>> | 84% | 39,798 psi | 90% | 2054 fps | 97.2% |
| Lovex S062 | <<locked>> | 88% | 38,159 psi | 86% | 2083 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 37,811 psi | 85% | 2064 fps | 98% |
| Norma 202 | <<locked>> | 84% | 37,724 psi | 85% | 2077 fps | 99.6% |
| Norma 203B | <<locked>> | 88% | 37,884 psi | 86% | 2110 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 88% | 37,782 psi | 85% | 2123 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 39,305 psi | 89% | 2123 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,360 psi | 78% | 1368 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 37,463 psi | 85% | 2156 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 37,739 psi | 85% | 2182 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 82% | 39,233 psi | 89% | 2064 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 86% | 38,072 psi | 86% | 2060 fps | 98% |
| Rottweil R 903 | <<locked>> | 94% | 39,537 psi | 89% | 2146 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 86% | 38,754 psi | 88% | 2119 fps | 99.4% |
| Shooters World Precision | <<locked>> | 88% | 38,159 psi | 86% | 2083 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 39,160 psi | 89% | 2156 fps | 96.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 39,378 psi | 89% | 2113 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 39,813 psi | 90% | 2034 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 38,899 psi | 88% | 2037 fps | 99.9% |
| Somchem S335 | <<locked>> | 84% | 39,160 psi | 89% | 2041 fps | 99.9% |
| Somchem S341 | <<locked>> | 84% | 37,869 psi | 86% | 2080 fps | 96.6% |
| Somchem S355 | <<locked>> | 92% | 38,537 psi | 87% | 2116 fps | 97.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,215 psi | 80% | 2133 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 39,711 psi | 90% | 2037 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 38,899 psi | 88% | 2090 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 37,913 psi | 86% | 2064 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 94% | 39,088 psi | 88% | 2103 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 82% | 38,072 psi | 86% | 2064 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 88% | 38,682 psi | 87% | 2093 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 38,218 psi | 86% | 2090 fps | 96.9% |
| Winchester 748 | <<locked>> | 84% | 39,117 psi | 88% | 2139 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 86% | 38,464 psi | 87% | 2116 fps | 97.5% |
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% | 37,188 psi | 84% | 2018 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 29,588 psi | 67% | 1942 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 35,317 psi | 80% | 2051 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 28,036 psi | 63% | 1923 fps | 98% |
| ADI AR 2206H | <<locked>> | 80% | 34,069 psi | 77% | 2014 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 88% | 37,260 psi | 84% | 2057 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,998 psi | 81% | 2028 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 80% | 34,360 psi | 78% | 2034 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 29,559 psi | 67% | 1949 fps | 95% |
| Alliant Reloder-15 | <<locked>> | 86% | 36,318 psi | 82% | 2080 fps | 95.7% |
| Alliant Reloder-17 | 43.4 gr | 90% | 33,359 psi | 75% | 2080 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 37,275 psi | 84% | 2090 fps | 95.2% |
| Bofors RP3 | <<locked>> | 84% | 30,443 psi | 69% | 1985 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,576 psi | 76% | 2037 fps | 97.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 36,999 psi | 84% | 2133 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 34,229 psi | 77% | 2024 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 32,474 psi | 73% | 2014 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,400 psi | 69% | 1985 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,324 psi | 57% | 1191 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 32,953 psi | 74% | 1985 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 32,663 psi | 74% | 2028 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 34,490 psi | 78% | 2001 fps | 95.1% |
| IMR 4895 | <<locked>> | 82% | 32,793 psi | 74% | 2021 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 35,998 psi | 81% | 2028 fps | 97.5% |
| Lovex D073.6 | <<locked>> | 80% | 31,807 psi | 72% | 1995 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 35,302 psi | 80% | 1975 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 30,008 psi | 68% | 1926 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 33,431 psi | 76% | 1982 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 33,272 psi | 75% | 1998 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 33,475 psi | 76% | 2028 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 86% | 35,360 psi | 80% | 2080 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,592 psi | 78% | 2034 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,367 psi | 57% | 1217 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 35,244 psi | 80% | 2110 fps | 95.2% |
| ReloadSwiss RS 60 | 39.5 gr | 82% | 27,586 psi | 62% | 1949 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 36,883 psi | 83% | 2024 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 31,662 psi | 72% | 1939 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 30,603 psi | 69% | 1982 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,807 psi | 72% | 1995 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 30,008 psi | 68% | 1926 fps | 95.7% |
| SNPE Vectan SP 11 | 41.8 gr | 88% | 34,577 psi | 78% | 2070 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 34,679 psi | 78% | 2028 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,331 psi | 80% | 1962 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,703 psi | 65% | 1854 fps | 98.6% |
| Somchem S335 | <<locked>> | 80% | 34,679 psi | 78% | 1965 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 33,315 psi | 75% | 1995 fps | 95% |
| Somchem S355 | <<locked>> | 86% | 32,053 psi | 72% | 1995 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 29,457 psi | 67% | 2005 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 35,273 psi | 80% | 1965 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,327 psi | 69% | 1942 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 31,401 psi | 71% | 1946 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 84% | 28,543 psi | 65% | 1903 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 35,737 psi | 81% | 2021 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 30,110 psi | 68% | 1936 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 33,634 psi | 76% | 2001 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 34,360 psi | 78% | 2051 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,647 psi | 72% | 1988 fps | 95.3% |
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 57 powders for .33 Win. loaded with the .338 | 250gr | Speer Grand Slam. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,182 fps; across all powders the maximum-charge window runs from 1,335 fps to 2,182 fps. Hodgdon Hybrid 100V gives the best case fill at 100 %, and 57 of the 57 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Hodgdon Hybrid 100V, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ReloadSwiss RS 60, Alliant Reloder-17, SNPE Vectan SP 11 rank at the top here: for .33 Win. with the .338 | 250gr | Speer Grand Slam 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.