Load Specifications
Load data in caliber .33 Win. with .338 | 231gr | Lapua Naturalis bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, IMR 3031 and Accurate 4064.
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>> | 86% | 37,913 psi | 86% | 2106 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 38,406 psi | 87% | 2142 fps | 98.8% |
| Accurate 2495 | <<locked>> | 94% | 38,014 psi | 86% | 2175 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 38,595 psi | 87% | 2182 fps | 98.6% |
| Accurate 4064 | <<locked>> | 96% | 37,869 psi | 86% | 2195 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 90% | 39,740 psi | 90% | 2185 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 39,624 psi | 90% | 2159 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 90% | 39,900 psi | 90% | 2205 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 39,769 psi | 90% | 2228 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 38,435 psi | 87% | 2192 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 82% | 38,624 psi | 87% | 2119 fps | 100% |
| Bofors RP3 | <<locked>> | 96% | 37,608 psi | 85% | 2192 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 86% | 40,001 psi | 90% | 2123 fps | 97.7% |
| Hodgdon BL-C2 | <<locked>> | 90% | 39,566 psi | 89% | 2215 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 84% | 39,972 psi | 90% | 2178 fps | 99.7% |
| Hodgdon H335 | <<locked>> | 82% | 37,753 psi | 85% | 2149 fps | 98.8% |
| Hodgdon H4895 | <<locked>> | 90% | 39,914 psi | 90% | 2195 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 38,247 psi | 86% | 2205 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,895 psi | 74% | 1358 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 39,059 psi | 88% | 2159 fps | 96% |
| IMR 3031 | <<locked>> | 90% | 38,072 psi | 86% | 2201 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 39,624 psi | 90% | 2159 fps | 97.1% |
| Lovex D073.5 | <<locked>> | 84% | 38,392 psi | 87% | 2142 fps | 97.8% |
| Lovex D073.6 | <<locked>> | 92% | 39,552 psi | 89% | 2208 fps | 98.7% |
| Lovex S062 | <<locked>> | 94% | 38,899 psi | 88% | 2165 fps | 97.1% |
| Norma 201 | <<locked>> | 90% | 38,783 psi | 88% | 2149 fps | 97% |
| Norma 202 | <<locked>> | 90% | 38,725 psi | 88% | 2165 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,924 psi | 74% | 1391 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 39,508 psi | 89% | 2156 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 39,421 psi | 89% | 2264 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 88% | 39,842 psi | 90% | 2149 fps | 99% |
| Rottweil R 902 | <<locked>> | 92% | 38,827 psi | 88% | 2142 fps | 97% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 39,958 psi | 90% | 2224 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 92% | 39,552 psi | 89% | 2208 fps | 98.7% |
| Shooters World Precision | <<locked>> | 94% | 38,899 psi | 88% | 2165 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 39,262 psi | 89% | 2116 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 39,494 psi | 89% | 2129 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 39,146 psi | 88% | 2090 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 37,739 psi | 85% | 2087 fps | 99.4% |
| Somchem S321 | <<locked>> | 86% | 39,610 psi | 90% | 2182 fps | 97.4% |
| Somchem S335 | <<locked>> | 88% | 37,884 psi | 86% | 2090 fps | 99.3% |
| Somchem S355 | <<locked>> | 98% | 39,131 psi | 88% | 2192 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 84% | 39,247 psi | 89% | 2087 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 38,899 psi | 88% | 2096 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 39,378 psi | 89% | 2178 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 38,827 psi | 88% | 2149 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 98% | 37,434 psi | 85% | 2139 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 88% | 39,494 psi | 89% | 2152 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 94% | 39,755 psi | 90% | 2182 fps | 99% |
| Winchester 748 | <<locked>> | 88% | 37,942 psi | 86% | 2185 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 92% | 39,697 psi | 90% | 2201 fps | 96.4% |
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% | 31,270 psi | 71% | 1988 fps | 99.3% |
| Accurate 2460 | <<locked>> | 80% | 33,533 psi | 76% | 2054 fps | 97.7% |
| Accurate 2495 | <<locked>> | 80% | 23,511 psi | 53% | 1883 fps | 97.6% |
| Accurate 2520 | <<locked>> | 80% | 29,051 psi | 66% | 1998 fps | 95.8% |
| Accurate 4064 | 34.9 gr | 82% | 23,989 psi | 54% | 1903 fps | 95% |
| ADI AR 2206H | <<locked>> | 88% | 37,217 psi | 84% | 2139 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 84% | 35,012 psi | 79% | 2073 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 28,761 psi | 65% | 2005 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 34,867 psi | 79% | 2136 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 33,881 psi | 77% | 2106 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,289 psi | 82% | 2083 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 35,085 psi | 79% | 2146 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 33,199 psi | 75% | 1998 fps | 95.8% |
| Hodgdon BL-C2 | <<locked>> | 84% | 32,111 psi | 73% | 2077 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 34,867 psi | 79% | 2090 fps | 99% |
| Hodgdon H335 | <<locked>> | 80% | 35,070 psi | 79% | 2100 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 86% | 35,215 psi | 80% | 2110 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 35,607 psi | 80% | 2156 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,279 psi | 55% | 1211 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 36,593 psi | 83% | 2116 fps | 95.3% |
| IMR 3031 | 33.6 gr | 80% | 27,543 psi | 62% | 1988 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 84% | 35,012 psi | 79% | 2073 fps | 95.7% |
| Lovex D073.5 | <<locked>> | 80% | 33,301 psi | 75% | 2051 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 82% | 27,920 psi | 63% | 1985 fps | 95.3% |
| Lovex S062 | <<locked>> | 88% | 32,300 psi | 73% | 2044 fps | 95% |
| Norma 201 | <<locked>> | 86% | 34,214 psi | 77% | 2064 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 27,978 psi | 63% | 1955 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,178 psi | 55% | 1240 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 34,592 psi | 78% | 2067 fps | 97.2% |
| ReloadSwiss RS 60 | 41.9 gr | 92% | 32,329 psi | 73% | 2116 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 31,256 psi | 71% | 1988 fps | 97% |
| Rottweil R 902 | <<locked>> | 88% | 34,476 psi | 78% | 2064 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 96% | 35,012 psi | 79% | 2136 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 82% | 27,920 psi | 63% | 1985 fps | 95.3% |
| Shooters World Precision | <<locked>> | 88% | 32,300 psi | 73% | 2044 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 36,709 psi | 83% | 2073 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,115 psi | 84% | 2093 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 30,443 psi | 69% | 1932 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 24,540 psi | 55% | 1818 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 32,271 psi | 73% | 2047 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 29,544 psi | 67% | 1932 fps | 97.5% |
| Somchem S355 | <<locked>> | 96% | 36,579 psi | 83% | 2146 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 34,780 psi | 79% | 2011 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 30,269 psi | 68% | 1942 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 25,164 psi | 57% | 1903 fps | 98% |
| Vihtavuori N140 | <<locked>> | 80% | 26,542 psi | 60% | 1906 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 94% | 32,938 psi | 74% | 2057 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 84% | 34,766 psi | 79% | 2067 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 82% | 27,021 psi | 61% | 1932 fps | 95.4% |
| Winchester 748 | <<locked>> | 82% | 31,169 psi | 70% | 2051 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 90% | 37,188 psi | 84% | 2159 fps | 95.6% |
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 51 powders for .33 Win. loaded with the .338 | 231gr | Lapua Naturalis. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,264 fps; across all powders the maximum-charge window runs from 1,358 fps to 2,264 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 231.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Rottweil R 903 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, IMR 3031, Accurate 4064 rank at the top here: for .33 Win. with the .338 | 231gr | Lapua Naturalis 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.