Load Specifications
Load data in caliber .277 Fury Commercial with .277 | 150gr | Alaska Bullet Works Kodiak SP SPBC 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 Power Pro 2000-MR, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 55,970 psi | 89% | 2454 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,563 psi | 86% | 2480 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,664 psi | 85% | 2470 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,289 psi | 89% | 2536 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 56,797 psi | 90% | 2549 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,791 psi | 77% | 2507 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 55,419 psi | 88% | 2405 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,898 psi | 89% | 2428 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,911 psi | 87% | 2533 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 96% | 55,753 psi | 88% | 2530 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 56,188 psi | 89% | 2510 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,230 psi | 86% | 2497 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 54,273 psi | 86% | 2480 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,738 psi | 88% | 2585 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,259 psi | 86% | 2631 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,143 psi | 87% | 2549 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,869 psi | 89% | 2457 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,304 psi | 89% | 2572 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,385 psi | 77% | 2516 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,680 psi | 88% | 2654 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,505 psi | 86% | 2405 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,476 psi | 86% | 2546 fps | 98.7% |
| Bofors RP3 | <<locked>> | 96% | 55,767 psi | 88% | 2566 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,521 psi | 90% | 2530 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,086 psi | 89% | 2480 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,594 psi | 90% | 2569 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,042 psi | 87% | 2605 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 84% | 54,897 psi | 87% | 2497 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,941 psi | 89% | 2520 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 57,072 psi | 90% | 2572 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 90% | 55,390 psi | 88% | 2546 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,382 psi | 70% | 2411 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,143 psi | 86% | 2572 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,128 psi | 56% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,768 psi | 90% | 2549 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 55,114 psi | 87% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,259 psi | 88% | 2516 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,912 psi | 89% | 2497 fps | 96.2% |
| IMR 4198 | <<locked>> | 84% | 56,144 psi | 89% | 2425 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,926 psi | 87% | 2510 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,789 psi | 74% | 2461 fps | 97.4% |
| IMR 4895 | <<locked>> | 92% | 53,882 psi | 85% | 2549 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 88% | 54,230 psi | 86% | 2497 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 54,505 psi | 86% | 2487 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,998 psi | 86% | 2516 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,998 psi | 87% | 2474 fps | 99.4% |
| Lovex S062 | <<locked>> | 94% | 54,839 psi | 87% | 2513 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,737 psi | 85% | 2503 fps | 97.2% |
| Norma 201 | <<locked>> | 92% | 57,058 psi | 90% | 2533 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,056 psi | 86% | 2493 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,405 psi | 88% | 2562 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 48,718 psi | 77% | 2503 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 94% | 55,811 psi | 88% | 2585 fps | 99.4% |
| Ramshot TAC | <<locked>> | 88% | 54,520 psi | 86% | 2507 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,954 psi | 86% | 2526 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,172 psi | 87% | 2497 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,259 psi | 56% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,751 psi | 85% | 2480 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,128 psi | 86% | 2507 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,478 psi | 90% | 2631 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,840 psi | 89% | 2661 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,544 psi | 77% | 2526 fps | 97.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,371 psi | 78% | 2543 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 88% | 54,940 psi | 87% | 2477 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,201 psi | 86% | 2487 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 55,622 psi | 88% | 2556 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,521 psi | 90% | 2530 fps | 95.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,737 psi | 85% | 2503 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,998 psi | 86% | 2516 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,839 psi | 87% | 2513 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,490 psi | 85% | 2454 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,492 psi | 90% | 2520 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,882 psi | 85% | 2562 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,971 psi | 90% | 2480 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,362 psi | 89% | 2536 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,913 psi | 90% | 2559 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,738 psi | 88% | 2441 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,274 psi | 88% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,404 psi | 86% | 2464 fps | 95.9% |
| Somchem S321 | <<locked>> | 86% | 55,608 psi | 88% | 2530 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,810 psi | 87% | 2441 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,709 psi | 88% | 2530 fps | 99.4% |
| Somchem S355 | <<locked>> | 98% | 55,869 psi | 89% | 2552 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,308 psi | 69% | 2454 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 55,419 psi | 88% | 2411 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,738 psi | 88% | 2431 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,985 psi | 90% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,476 psi | 86% | 2474 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,244 psi | 86% | 2497 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,111 psi | 81% | 2503 fps | 97.9% |
| Vihtavuori N530 | <<locked>> | 88% | 54,781 psi | 87% | 2497 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 56,159 psi | 89% | 2516 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 2507 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,315 psi | 83% | 2500 fps | 99.5% |
| Winchester 748 | <<locked>> | 88% | 54,157 psi | 86% | 2539 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,608 psi | 90% | 2566 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,947 psi | 70% | 2293 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,529 psi | 75% | 2382 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,419 psi | 58% | 2211 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,844 psi | 68% | 2339 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 34,432 psi | 55% | 2195 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 39,885 psi | 63% | 2359 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 52,170 psi | 83% | 2362 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,576 psi | 83% | 2385 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,234 psi | 64% | 2293 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 38,725 psi | 61% | 2251 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 52,779 psi | 84% | 2467 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,279 psi | 67% | 2310 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 41,611 psi | 66% | 2310 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,095 psi | 78% | 2487 fps | 99.2% |
| Alliant Power Pro 2000-MR | 35.9 gr | 82% | 38,725 psi | 61% | 2349 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,634 psi | 53% | 2178 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,327 psi | 78% | 2375 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,114 psi | 57% | 2228 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 94% | 40,030 psi | 63% | 2359 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,172 psi | 56% | 2283 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,111 psi | 81% | 2362 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,088 psi | 62% | 2290 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 32,953 psi | 52% | 2175 fps | 95.8% |
| Bofors RP7 | <<locked>> | 98% | 53,142 psi | 84% | 2484 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,251 psi | 70% | 2306 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,379 psi | 64% | 2320 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,585 psi | 71% | 2444 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 80% | 48,356 psi | 77% | 2408 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,168 psi | 78% | 2428 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,162 psi | 65% | 2323 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,553 psi | 64% | 2306 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,592 psi | 55% | 2221 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,506 psi | 58% | 2274 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 41% | 1348 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,030 psi | 62% | 2264 fps | 97.1% |
| IMR 3031 | <<locked>> | 80% | 39,769 psi | 63% | 2310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,853 psi | 57% | 2188 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 90% | 52,707 psi | 84% | 2451 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,879 psi | 79% | 2346 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,764 psi | 82% | 2464 fps | 95.2% |
| IMR 4831 | <<locked>> | 94% | 38,363 psi | 61% | 2310 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 36,941 psi | 59% | 2257 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 80% | 42,279 psi | 67% | 2310 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 47,500 psi | 75% | 2388 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 38,827 psi | 62% | 2280 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 40,785 psi | 65% | 2247 fps | 97.2% |
| Lovex S062 | <<locked>> | 80% | 35,723 psi | 57% | 2195 fps | 97.1% |
| Lovex S065 | <<locked>> | 94% | 44,846 psi | 71% | 2365 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 39,523 psi | 63% | 2257 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 39,697 psi | 63% | 2274 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 35,476 psi | 56% | 2221 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 40,001 psi | 63% | 2352 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 82% | 37,217 psi | 59% | 2277 fps | 95.8% |
| Ramshot TAC | <<locked>> | 82% | 45,063 psi | 71% | 2359 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,437 psi | 66% | 2326 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,643 psi | 72% | 2352 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,281 psi | 42% | 1381 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,239 psi | 75% | 2385 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 47,659 psi | 76% | 2408 fps | 95.1% |
| ReloadSwiss RS 52 | 34 gr | 80% | 37,376 psi | 59% | 2313 fps | 95.4% |
| ReloadSwiss RS 60 | 34.5 gr | 80% | 30,763 psi | 49% | 2182 fps | 96.2% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 42,467 psi | 67% | 2425 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 46,021 psi | 73% | 2487 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 43,482 psi | 69% | 2306 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 37,507 psi | 59% | 2211 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 33,141 psi | 53% | 2175 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 98% | 53,142 psi | 84% | 2484 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,846 psi | 71% | 2365 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,827 psi | 62% | 2280 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 35,723 psi | 57% | 2195 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,908 psi | 79% | 2402 fps | 99.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,185 psi | 84% | 2477 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,477 psi | 58% | 2267 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,169 psi | 80% | 2395 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 43,047 psi | 68% | 2329 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,841 psi | 62% | 2267 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,031 psi | 65% | 2228 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,837 psi | 54% | 2106 fps | 99.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,024 psi | 81% | 2418 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 45,353 psi | 72% | 2379 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 40,611 psi | 64% | 2231 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 39,856 psi | 63% | 2280 fps | 96.7% |
| Somchem S355 | <<locked>> | 82% | 34,127 psi | 54% | 2182 fps | 95.6% |
| Somchem S365 | <<locked>> | 90% | 31,517 psi | 50% | 2205 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 46,456 psi | 74% | 2293 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,234 psi | 65% | 2231 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,608 psi | 58% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,304 psi | 59% | 2211 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 30,226 psi | 48% | 2080 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 92% | 39,465 psi | 63% | 2310 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 42,351 psi | 67% | 2306 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 35,940 psi | 57% | 2198 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 41,321 psi | 65% | 2359 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,027 psi | 56% | 2195 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 41,234 psi | 65% | 2339 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,985 psi | 60% | 2267 fps | 96.9% |
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 109 powders for .277 Fury Commercial loaded with the .277 | 150gr | Alaska Bullet Works Kodiak SP SPBC. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,661 fps. Accurate 4350 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 Power Pro 2000-MR, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for .277 Fury Commercial with the .277 | 150gr | Alaska Bullet Works Kodiak SP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Alliant Reloder-26 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.