Load Specifications
Load data in caliber .33 Nosler with .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N560 and Norma MRP.
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 2495 | <<locked>> | 82% | 57,740 psi | 89% | 2251 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,436 psi | 90% | 2333 fps | 99.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2385 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,030 psi | 89% | 2300 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,361 psi | 85% | 2372 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,911 psi | 84% | 2474 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 86% | 57,653 psi | 89% | 2336 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,043 psi | 86% | 2421 fps | 99.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,985 psi | 88% | 2467 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 41,626 psi | 64% | 2234 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,811 psi | 57% | 2205 fps | 98.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,450 psi | 88% | 2448 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,999 psi | 86% | 2415 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,740 psi | 90% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,434 psi | 85% | 2333 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,043 psi | 86% | 2415 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,406 psi | 88% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,245 psi | 85% | 2408 fps | 99.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2464 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,330 psi | 82% | 2392 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,166 psi | 71% | 2352 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,232 psi | 88% | 2520 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2392 fps | 96.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,532 psi | 79% | 2405 fps | 99.3% |
| Bofors RP3 | <<locked>> | 84% | 56,057 psi | 86% | 2326 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,105 psi | 65% | 2297 fps | 97.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 2464 fps | 99.8% |
| Bofors RP7 | <<locked>> | 90% | 58,798 psi | 90% | 2372 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,905 psi | 71% | 2310 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 56,478 psi | 87% | 2349 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,319 psi | 88% | 2418 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 56,826 psi | 87% | 2382 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 98% | 57,363 psi | 88% | 2418 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,028 psi | 86% | 2402 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,289 psi | 87% | 2346 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,885 psi | 89% | 2372 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,310 psi | 70% | 2398 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 90% | 57,377 psi | 88% | 2457 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 1407 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,146 psi | 89% | 2333 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,319 psi | 88% | 2320 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,275 psi | 87% | 2313 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 56,304 psi | 87% | 2362 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,797 psi | 87% | 2349 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 55,506 psi | 85% | 2362 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,855 psi | 87% | 2352 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,639 psi | 90% | 2402 fps | 98.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,549 psi | 84% | 2448 fps | 99% |
| Lovex S060 | <<locked>> | 82% | 58,726 psi | 90% | 2300 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,522 psi | 88% | 2310 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,087 psi | 88% | 2346 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,552 psi | 90% | 2385 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,195 psi | 73% | 2267 fps | 99.9% |
| Norma 203B | <<locked>> | 84% | 58,262 psi | 90% | 2362 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,014 psi | 88% | 2411 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 32,285 psi | 50% | 2139 fps | 96% |
| Norma MRP | <<locked>> | 98% | 55,970 psi | 86% | 2487 fps | 100% |
| Norma URP | <<locked>> | 92% | 57,537 psi | 89% | 2402 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,347 psi | 85% | 2346 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,013 psi | 85% | 2464 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 92% | 56,057 psi | 86% | 2408 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,950 psi | 75% | 2359 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 58% | 1444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,057 psi | 86% | 2336 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,797 psi | 87% | 2421 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 58,769 psi | 90% | 2438 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,072 psi | 88% | 2464 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,078 psi | 69% | 2395 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 82% | 56,173 psi | 86% | 2277 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,188 psi | 86% | 2326 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,638 psi | 89% | 2392 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 58,320 psi | 90% | 2444 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 90% | 58,798 psi | 90% | 2372 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,087 psi | 88% | 2346 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,522 psi | 88% | 2310 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,552 psi | 90% | 2385 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,667 psi | 89% | 2379 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,682 psi | 90% | 2349 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,116 psi | 88% | 2218 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,695 psi | 87% | 2310 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,827 psi | 89% | 2441 fps | 99.8% |
| Somchem S355 | <<locked>> | 86% | 56,144 psi | 86% | 2323 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,579 psi | 86% | 2346 fps | 98.4% |
| Somchem S365 | <<locked>> | 94% | 57,072 psi | 88% | 2398 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,726 psi | 90% | 2418 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,565 psi | 87% | 2234 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,666 psi | 87% | 2254 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,319 psi | 88% | 2297 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,028 psi | 86% | 2349 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,447 psi | 84% | 2359 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 84% | 58,305 psi | 90% | 2297 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 58,436 psi | 90% | 2398 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,999 psi | 86% | 2415 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,217 psi | 86% | 2484 fps | 98.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,993 psi | 74% | 2365 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,216 psi | 85% | 2323 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,522 psi | 88% | 2421 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,747 psi | 75% | 2461 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,230 psi | 85% | 2375 fps | 99.5% |
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 2495 | <<locked>> | 80% | 54,128 psi | 83% | 2215 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,358 psi | 79% | 2244 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 29,109 psi | 45% | 1949 fps | 96.4% |
| Accurate 4064 | <<locked>> | 80% | 51,343 psi | 79% | 2224 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,479 psi | 61% | 2152 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 90% | 41,597 psi | 64% | 2270 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 48,196 psi | 74% | 2215 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 35,679 psi | 55% | 2096 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 88% | 38,508 psi | 59% | 2175 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 98% | 39,175 psi | 60% | 2188 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 30,618 psi | 47% | 2060 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,534 psi | 82% | 2398 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 33,591 psi | 52% | 2051 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,849 psi | 75% | 2234 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,054 psi | 80% | 2290 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,363 psi | 59% | 2159 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,352 psi | 67% | 2254 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 33,286 psi | 51% | 2047 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 33,315 psi | 51% | 2090 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,181 psi | 43% | 1975 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 26,426 psi | 41% | 1942 fps | 95.5% |
| Alliant Reloder-26 | 59.6 gr | 80% | 30,081 psi | 46% | 2077 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 52,750 psi | 81% | 2346 fps | 95.7% |
| Bofors RP15 | <<locked>> | 88% | 35,259 psi | 54% | 2129 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 49,255 psi | 76% | 2244 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 36,985 psi | 57% | 2201 fps | 95.8% |
| Bofors RP5 | <<locked>> | 84% | 33,315 psi | 51% | 2090 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,250 psi | 67% | 2156 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 94% | 37,666 psi | 58% | 2162 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 49,487 psi | 76% | 2260 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,379 psi | 64% | 2195 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 44,164 psi | 68% | 2201 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 41,133 psi | 63% | 2182 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 40,350 psi | 62% | 2169 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,897 psi | 55% | 2067 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,099 psi | 83% | 2326 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 33,054 psi | 51% | 2146 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,176 psi | 62% | 2211 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 42% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,839 psi | 84% | 2293 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,720 psi | 78% | 2238 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,924 psi | 81% | 2270 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 38,798 psi | 60% | 2100 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,701 psi | 69% | 2178 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 37,971 psi | 58% | 2113 fps | 99.8% |
| IMR 4895 | <<locked>> | 80% | 53,403 psi | 82% | 2310 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 40,683 psi | 63% | 2139 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 39,320 psi | 60% | 2205 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 55,187 psi | 85% | 2260 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,966 psi | 78% | 2231 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,177 psi | 65% | 2139 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 40,393 psi | 62% | 2129 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 26,803 psi | 41% | 1893 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 51,401 psi | 79% | 2280 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,232 psi | 59% | 2126 fps | 96.6% |
| Norma 217 | <<locked>> | 98% | 30,429 psi | 47% | 2093 fps | 95.1% |
| Norma MRP | 57.8 gr | 80% | 30,313 psi | 47% | 2047 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 39,131 psi | 60% | 2146 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,779 psi | 80% | 2303 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 38,827 psi | 60% | 2208 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,869 psi | 58% | 2139 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 32,227 psi | 50% | 2067 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 43% | 1286 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,516 psi | 76% | 2254 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,050 psi | 71% | 2290 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,233 psi | 60% | 2172 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,739 psi | 58% | 2178 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 29,936 psi | 46% | 2070 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 52,750 psi | 81% | 2238 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,485 psi | 72% | 2205 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 37,115 psi | 57% | 2080 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 32,387 psi | 50% | 2034 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,250 psi | 67% | 2156 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,177 psi | 65% | 2139 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 50,966 psi | 78% | 2231 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,393 psi | 62% | 2129 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,514 psi | 73% | 2251 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,940 psi | 85% | 2306 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,514 psi | 73% | 2110 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,336 psi | 64% | 2096 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 34,330 psi | 53% | 2077 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,673 psi | 72% | 2201 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 40,132 psi | 62% | 2116 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,650 psi | 55% | 2110 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,953 psi | 51% | 2021 fps | 96.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,243 psi | 82% | 2198 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,214 psi | 82% | 2215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,541 psi | 69% | 2142 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,509 psi | 62% | 2139 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 32,460 psi | 50% | 2008 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,314 psi | 79% | 2218 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,871 psi | 61% | 2146 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 31,270 psi | 48% | 2034 fps | 99.1% |
| Vihtavuori N560 | 63.6 gr | 88% | 40,118 psi | 62% | 2234 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 39,204 psi | 60% | 2221 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,494 psi | 61% | 2116 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,379 psi | 64% | 2195 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,860 psi | 38% | 1975 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 34,287 psi | 53% | 2051 fps | 95.4% |
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 99 powders for .33 Nosler loaded with the .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic. Alliant Reloder-26 delivers the highest muzzle velocity at 2,520 fps; across all powders the maximum-charge window runs from 1,407 fps to 2,520 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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 Reloder-26, Vihtavuori N560, Norma MRP rank at the top here: for .33 Nosler with the .338 | 300gr | MAKER .338 ARC/Spectre Expanding Subsonic 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.