Load Specifications
Load data in caliber .33 Win. with .338 | 210gr | Impala RNFP KO bullet and 38 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Accurate 4064 and IMR 3031.
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>> | 84% | 38,711 psi | 88% | 2201 fps | 99.8% |
| Accurate 2460 | <<locked>> | 82% | 38,928 psi | 88% | 2228 fps | 98% |
| Accurate 2495 | <<locked>> | 92% | 39,595 psi | 90% | 2280 fps | 99.9% |
| Accurate 2520 | <<locked>> | 86% | 38,827 psi | 88% | 2267 fps | 97.7% |
| Accurate 4064 | <<locked>> | 94% | 39,320 psi | 89% | 2300 fps | 98.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 39,392 psi | 89% | 2238 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 88% | 39,624 psi | 90% | 2297 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 39,653 psi | 90% | 2198 fps | 96.6% |
| Hodgdon BL-C2 | <<locked>> | 88% | 39,204 psi | 89% | 2297 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 82% | 39,378 psi | 89% | 2257 fps | 99.1% |
| Hodgdon H335 | <<locked>> | 82% | 39,668 psi | 90% | 2270 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,707 psi | 76% | 1437 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 38,000 psi | 86% | 2287 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 86% | 39,392 psi | 89% | 2238 fps | 95.8% |
| Lovex D073.5 | <<locked>> | 82% | 38,885 psi | 88% | 2228 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 90% | 39,537 psi | 89% | 2293 fps | 97.8% |
| Lovex S062 | <<locked>> | 92% | 39,334 psi | 89% | 2254 fps | 96% |
| Norma 201 | <<locked>> | 88% | 39,160 psi | 89% | 2234 fps | 95.9% |
| Norma 202 | <<locked>> | 88% | 38,696 psi | 87% | 2251 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,924 psi | 77% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 39,102 psi | 88% | 2231 fps | 97.3% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 39,015 psi | 88% | 2336 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 84% | 38,986 psi | 88% | 2208 fps | 98% |
| Rottweil R 902 | <<locked>> | 90% | 39,450 psi | 89% | 2231 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 39,537 psi | 89% | 2293 fps | 97.8% |
| Shooters World Precision | <<locked>> | 92% | 39,334 psi | 89% | 2254 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 38,986 psi | 88% | 2169 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 39,755 psi | 90% | 2205 fps | 99.1% |
| Somchem S321 | <<locked>> | 84% | 39,523 psi | 89% | 2264 fps | 96.3% |
| Somchem S335 | <<locked>> | 86% | 38,363 psi | 87% | 2178 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 82% | 39,204 psi | 89% | 2172 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 38,435 psi | 87% | 2175 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 92% | 39,552 psi | 89% | 2270 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 90% | 38,812 psi | 88% | 2234 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 98% | 39,784 psi | 90% | 2264 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 86% | 39,276 psi | 89% | 2231 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 92% | 39,610 psi | 90% | 2267 fps | 98.2% |
| Winchester 748 | <<locked>> | 88% | 39,958 psi | 90% | 2306 fps | 97% |
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% | 34,505 psi | 78% | 2123 fps | 99.3% |
| Accurate 2460 | <<locked>> | 80% | 36,767 psi | 83% | 2188 fps | 97.5% |
| Accurate 2495 | <<locked>> | 80% | 27,804 psi | 63% | 2041 fps | 98.1% |
| Accurate 2520 | <<locked>> | 80% | 32,213 psi | 73% | 2136 fps | 95.7% |
| Accurate 4064 | 35.8 gr | 82% | 27,934 psi | 63% | 2054 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 37,144 psi | 84% | 2195 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 31,415 psi | 71% | 2139 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 80% | 35,578 psi | 80% | 2119 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 84% | 34,650 psi | 78% | 2205 fps | 95.2% |
| Hodgdon H322 | <<locked>> | 80% | 37,057 psi | 84% | 2215 fps | 98.7% |
| Hodgdon H335 | <<locked>> | 80% | 37,391 psi | 85% | 2228 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,164 psi | 57% | 1283 fps | 100% |
| IMR 3031 | 34.5 gr | 80% | 30,066 psi | 68% | 2116 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 84% | 37,144 psi | 84% | 2195 fps | 95.1% |
| Lovex D073.5 | <<locked>> | 80% | 36,390 psi | 82% | 2182 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 30,864 psi | 70% | 2119 fps | 95.2% |
| Lovex S062 | <<locked>> | 90% | 37,101 psi | 84% | 2211 fps | 95.3% |
| Norma 201 | <<locked>> | 86% | 37,188 psi | 84% | 2195 fps | 95.3% |
| Norma 202 | <<locked>> | 80% | 30,501 psi | 69% | 2080 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,469 psi | 58% | 1316 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 36,840 psi | 83% | 2188 fps | 96.7% |
| ReloadSwiss RS 60 | 44 gr | 94% | 36,637 psi | 83% | 2283 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 34,998 psi | 79% | 2126 fps | 97% |
| Rottweil R 902 | <<locked>> | 88% | 37,434 psi | 85% | 2192 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 30,864 psi | 70% | 2119 fps | 95.2% |
| Shooters World Precision | <<locked>> | 90% | 37,101 psi | 84% | 2211 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 32,938 psi | 74% | 2054 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,977 psi | 61% | 1939 fps | 95.4% |
| Somchem S321 | <<locked>> | 82% | 37,072 psi | 84% | 2218 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 32,300 psi | 73% | 2057 fps | 97.3% |
| Vihtavuori N130 | <<locked>> | 80% | 37,144 psi | 84% | 2136 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 32,503 psi | 73% | 2064 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 80% | 27,978 psi | 63% | 2034 fps | 97.9% |
| Vihtavuori N140 | <<locked>> | 80% | 29,037 psi | 66% | 2028 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 94% | 35,346 psi | 80% | 2182 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 84% | 36,970 psi | 84% | 2188 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 82% | 29,588 psi | 67% | 2057 fps | 95.1% |
| Winchester 748 | <<locked>> | 84% | 35,592 psi | 80% | 2218 fps | 95.7% |
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 38 powders for .33 Win. loaded with the .338 | 210gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,336 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,336 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. 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, Accurate 4064, IMR 3031 rank at the top here: for .33 Win. with the .338 | 210gr | Impala RNFP KO 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.