Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 300gr | Nosler Custom Competition bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,897 psi | 90% | 2231 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,592 psi | 88% | 2274 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,127 psi | 87% | 2356 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 51,967 psi | 85% | 2244 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 52,127 psi | 86% | 2346 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 51,996 psi | 85% | 2441 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 52,083 psi | 86% | 2277 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,953 psi | 87% | 2388 fps | 99.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,998 psi | 89% | 2438 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,737 psi | 57% | 2172 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,621 psi | 90% | 2425 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,678 psi | 86% | 2293 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,924 psi | 87% | 2313 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,924 psi | 87% | 2388 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,925 psi | 89% | 2408 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 52,388 psi | 86% | 2385 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,721 psi | 87% | 2434 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,053 psi | 82% | 2369 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,424 psi | 71% | 2323 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,055 psi | 87% | 2490 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 53,548 psi | 88% | 2362 fps | 95.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,515 psi | 80% | 2375 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 53,287 psi | 87% | 2306 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 39,392 psi | 65% | 2264 fps | 96.6% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,721 psi | 87% | 2434 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 52,895 psi | 87% | 2306 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 40,509 psi | 67% | 2224 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 84% | 53,650 psi | 88% | 2326 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 51,837 psi | 85% | 2362 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 90% | 52,692 psi | 87% | 2336 fps | 99.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 49,850 psi | 82% | 2329 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,142 psi | 87% | 2375 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,200 psi | 87% | 2323 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 51,822 psi | 85% | 2310 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,685 psi | 70% | 2362 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 90% | 54,172 psi | 89% | 2431 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 60% | 1401 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,897 psi | 90% | 2303 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,534 psi | 90% | 2274 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,331 psi | 89% | 2290 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,374 psi | 88% | 2283 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 53,650 psi | 88% | 2336 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,505 psi | 89% | 2326 fps | 99.9% |
| IMR 4831 | <<locked>> | 96% | 53,592 psi | 88% | 2352 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,302 psi | 89% | 2333 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,562 psi | 86% | 2333 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 51,764 psi | 85% | 2421 fps | 98.6% |
| Lovex S062 | <<locked>> | 84% | 55,027 psi | 90% | 2290 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,505 psi | 89% | 2323 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 52,504 psi | 86% | 2320 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,324 psi | 73% | 2241 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 52,243 psi | 86% | 2300 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,143 psi | 89% | 2385 fps | 99.4% |
| Norma MRP | <<locked>> | 98% | 52,286 psi | 86% | 2457 fps | 100% |
| Norma URP | <<locked>> | 92% | 54,520 psi | 90% | 2379 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,852 psi | 87% | 2326 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 51,430 psi | 84% | 2425 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 53,055 psi | 87% | 2385 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,634 psi | 85% | 2405 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,304 psi | 61% | 1437 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,708 psi | 88% | 2316 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,461 psi | 88% | 2398 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 51,692 psi | 85% | 2369 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,853 psi | 88% | 2438 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,177 psi | 69% | 2356 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 53,838 psi | 88% | 2260 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,417 psi | 88% | 2303 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,853 psi | 90% | 2365 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 55,027 psi | 90% | 2415 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 52,895 psi | 87% | 2306 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,505 psi | 89% | 2323 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,027 psi | 90% | 2290 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 52,504 psi | 86% | 2320 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,853 psi | 90% | 2356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,723 psi | 90% | 2201 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,012 psi | 89% | 2283 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,549 psi | 90% | 2411 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 53,476 psi | 88% | 2300 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,794 psi | 87% | 2316 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 53,563 psi | 88% | 2375 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 52,272 psi | 86% | 2349 fps | 99.7% |
| Unknown powder | <<locked>> | 90% | 55,071 psi | 90% | 2379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 54,201 psi | 89% | 2218 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,128 psi | 89% | 2234 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,839 psi | 90% | 2280 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,084 psi | 87% | 2326 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,300 psi | 84% | 2329 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 52,315 psi | 86% | 2238 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 52,156 psi | 86% | 2336 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 52,460 psi | 86% | 2388 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,721 psi | 87% | 2451 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 44,773 psi | 74% | 2333 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 52,228 psi | 86% | 2300 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 51,837 psi | 85% | 2362 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,092 psi | 74% | 2431 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,693 psi | 88% | 2365 fps | 99.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,735 psi | 85% | 2198 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,309 psi | 73% | 2146 fps | 98.7% |
| Accurate 3100 | <<locked>> | 80% | 27,340 psi | 45% | 1926 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,066 psi | 81% | 2208 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,246 psi | 61% | 2129 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 96% | 45,382 psi | 75% | 2343 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 46,282 psi | 76% | 2198 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 33,910 psi | 56% | 2070 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 38,928 psi | 64% | 2195 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 30,719 psi | 50% | 2077 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,705 psi | 83% | 2375 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,572 psi | 76% | 2215 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,777 psi | 82% | 2270 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,347 psi | 60% | 2136 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,075 psi | 67% | 2234 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 33,692 psi | 55% | 2070 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 33,620 psi | 55% | 2113 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,745 psi | 44% | 1955 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 26,585 psi | 44% | 1962 fps | 95.7% |
| Alliant Reloder-26 | 56.8 gr | 80% | 28,268 psi | 46% | 2051 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 50,401 psi | 83% | 2316 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 33,373 psi | 55% | 2106 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 46,963 psi | 77% | 2228 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 34,795 psi | 57% | 2172 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 33,620 psi | 55% | 2113 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 41,336 psi | 68% | 2133 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 98% | 38,014 psi | 62% | 2175 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,123 psi | 77% | 2238 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,380 psi | 70% | 2224 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 38,899 psi | 64% | 2123 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 94% | 41,408 psi | 68% | 2198 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 40,799 psi | 67% | 2188 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,982 psi | 56% | 2047 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,472 psi | 80% | 2270 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 33,301 psi | 55% | 2162 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 37,840 psi | 62% | 2182 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 45% | 1250 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,747 psi | 80% | 2228 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,358 psi | 84% | 2238 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,469 psi | 75% | 2175 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,672 psi | 73% | 2159 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 36,999 psi | 61% | 2080 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,801 psi | 70% | 2159 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 32,692 psi | 54% | 2028 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 51,039 psi | 84% | 2293 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 41,220 psi | 68% | 2159 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 39,769 psi | 65% | 2224 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 48,892 psi | 80% | 2215 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,408 psi | 66% | 2119 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 38,464 psi | 63% | 2106 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 26,774 psi | 44% | 1913 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 49,110 psi | 81% | 2260 fps | 100% |
| Norma 204 | <<locked>> | 80% | 36,274 psi | 60% | 2103 fps | 96% |
| Norma MRP | 56.5 gr | 82% | 30,632 psi | 50% | 2073 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,043 psi | 61% | 2123 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 80% | 49,226 psi | 81% | 2280 fps | 100% |
| Ramshot Grand | 62.5 gr | 88% | 38,595 psi | 63% | 2215 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 35,810 psi | 59% | 2119 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 33,388 psi | 55% | 2103 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 46% | 1280 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,166 psi | 77% | 2228 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,642 psi | 72% | 2270 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,854 psi | 61% | 2146 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,737 psi | 59% | 2156 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 30,124 psi | 49% | 2090 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,618 psi | 83% | 2221 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,179 psi | 73% | 2185 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 37,666 psi | 62% | 2103 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 32,663 psi | 54% | 2054 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 41,336 psi | 68% | 2133 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,408 psi | 66% | 2119 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 48,892 psi | 80% | 2215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,464 psi | 63% | 2106 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,150 psi | 74% | 2231 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,513 psi | 75% | 2093 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,349 psi | 65% | 2073 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 32,358 psi | 53% | 2051 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 44,672 psi | 73% | 2185 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 40,756 psi | 67% | 2139 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 33,533 psi | 55% | 2090 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 31,212 psi | 51% | 2001 fps | 95.5% |
| Unknown powder | <<locked>> | 80% | 39,972 psi | 66% | 2165 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 80% | 50,879 psi | 84% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,937 psi | 84% | 2198 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,438 psi | 70% | 2123 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,450 psi | 63% | 2119 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 32,764 psi | 54% | 2031 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,023 psi | 80% | 2198 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,797 psi | 62% | 2123 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,385 psi | 48% | 2014 fps | 98.8% |
| Vihtavuori N560 | <<locked>> | 90% | 40,495 psi | 66% | 2257 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 39,146 psi | 64% | 2238 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,391 psi | 61% | 2093 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,380 psi | 70% | 2224 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,482 psi | 39% | 1949 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,083 psi | 54% | 2037 fps | 95% |
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 96 powders for .338 Blaser Mag. loaded with the .338 | 300gr | Nosler Custom Competition. Alliant Reloder-26 delivers the highest muzzle velocity at 2,490 fps; across all powders the maximum-charge window runs from 1,401 fps to 2,490 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Ramshot Grand, Norma MRP rank at the top here: for .338 Blaser Mag. with the .338 | 300gr | Nosler Custom Competition 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.