Load Specifications
Load data in caliber .270 Win. Ackley Improved with .277 | 87gr | CutEdge ESP Raptor bullet and 95 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 52 and Hodgdon CFE223.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 62,888 psi | 87% | 3478 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 64,237 psi | 89% | 3570 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 65,180 psi | 90% | 3711 fps | 98.9% |
| Accurate 2230 | <<locked>> | 84% | 62,859 psi | 87% | 3655 fps | 98.9% |
| Accurate 2460 | <<locked>> | 90% | 63,672 psi | 88% | 3606 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 62,004 psi | 86% | 3576 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 61,699 psi | 85% | 3609 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 61,525 psi | 85% | 3619 fps | 100% |
| Accurate LT-30 | <<locked>> | 88% | 63,802 psi | 88% | 3524 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 64,223 psi | 89% | 3553 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 65,137 psi | 90% | 2864 fps | 100% |
| ADI AR 2206H | <<locked>> | 96% | 63,817 psi | 88% | 3675 fps | 99.3% |
| ADI AR 2207 | <<locked>> | 86% | 65,412 psi | 90% | 3550 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 61,177 psi | 84% | 3599 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 86% | 61,786 psi | 85% | 3609 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 62,903 psi | 87% | 3625 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 94% | 63,179 psi | 87% | 3612 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 90% | 64,905 psi | 90% | 3770 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 64,919 psi | 90% | 3816 fps | 99.1% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 60,234 psi | 83% | 3619 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 90% | 63,744 psi | 88% | 3593 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 65,485 psi | 90% | 3714 fps | 99.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,273 psi | 75% | 3615 fps | 98.8% |
| Alliant Reloder-7 | <<locked>> | 84% | 62,468 psi | 86% | 3514 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 63,788 psi | 88% | 3501 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 64,832 psi | 89% | 3688 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 61,525 psi | 85% | 3642 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 94% | 64,905 psi | 90% | 3609 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 62,758 psi | 87% | 3658 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 92% | 65,398 psi | 90% | 3783 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 90% | 63,889 psi | 88% | 3642 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 61,569 psi | 85% | 3606 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 63,179 psi | 87% | 3652 fps | 98% |
| Hodgdon H4198 | <<locked>> | 84% | 62,062 psi | 86% | 3530 fps | 100% |
| Hodgdon H4895 | <<locked>> | 96% | 64,440 psi | 89% | 3688 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 64,397 psi | 89% | 3727 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,113 psi | 47% | 2224 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 62,221 psi | 86% | 3632 fps | 99.5% |
| IMR 3031 | <<locked>> | 96% | 63,846 psi | 88% | 3681 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 64,571 psi | 89% | 3648 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 98% | 65,601 psi | 90% | 3622 fps | 96.2% |
| IMR 4198 | <<locked>> | 90% | 63,831 psi | 88% | 3550 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 64,934 psi | 90% | 3504 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 62,932 psi | 87% | 3691 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 94% | 62,903 psi | 87% | 3625 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 84% | 63,324 psi | 87% | 3625 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 63,860 psi | 88% | 3615 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 63,759 psi | 88% | 3648 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 63,121 psi | 87% | 3425 fps | 100% |
| Lovex S060 | <<locked>> | 96% | 63,498 psi | 88% | 3589 fps | 99.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 63,614 psi | 88% | 3638 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 63,773 psi | 88% | 3560 fps | 100% |
| Norma 201 | <<locked>> | 96% | 62,163 psi | 86% | 3609 fps | 99.8% |
| Norma 202 | <<locked>> | 96% | 62,845 psi | 87% | 3622 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 64,455 psi | 89% | 3698 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 98% | 62,047 psi | 86% | 3665 fps | 99.1% |
| Ramshot TAC | <<locked>> | 94% | 64,440 psi | 89% | 3635 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 94% | 63,672 psi | 88% | 3661 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 92% | 64,977 psi | 90% | 3629 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,345 psi | 47% | 2274 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 62,917 psi | 87% | 3619 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 63,875 psi | 88% | 3622 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 62,163 psi | 86% | 3734 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 58,073 psi | 80% | 3701 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 62,453 psi | 86% | 3596 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 62,337 psi | 86% | 3599 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,898 psi | 78% | 3556 fps | 99.1% |
| Shooters World AR Plus | <<locked>> | 84% | 63,324 psi | 87% | 3625 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 96% | 63,759 psi | 88% | 3648 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 63,614 psi | 88% | 3638 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 63,121 psi | 87% | 3583 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 62,337 psi | 86% | 3228 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 62,004 psi | 86% | 3612 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 59,509 psi | 82% | 3632 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 65,035 psi | 90% | 3622 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 62,453 psi | 86% | 3602 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 62,482 psi | 86% | 3632 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 64,629 psi | 89% | 3560 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 60,379 psi | 83% | 3481 fps | 100% |
| Somchem S321 | <<locked>> | 92% | 65,456 psi | 90% | 3671 fps | 100% |
| Somchem S335 | <<locked>> | 96% | 63,396 psi | 87% | 3543 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 61,844 psi | 85% | 3596 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,261 psi | 79% | 3553 fps | 99% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,394 psi | 57% | 3323 fps | 97.2% |
| Vihtavuori N120 | <<locked>> | 86% | 65,108 psi | 90% | 3481 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 63,773 psi | 88% | 3524 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 64,324 psi | 89% | 3537 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 65,427 psi | 90% | 3622 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 63,686 psi | 88% | 3593 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,738 psi | 77% | 3481 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 94% | 64,107 psi | 88% | 3629 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 61,888 psi | 85% | 3579 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,836 psi | 70% | 3396 fps | 98.2% |
| Winchester 748 | <<locked>> | 94% | 63,947 psi | 88% | 3684 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 62,816 psi | 87% | 3648 fps | 99.6% |
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 1680 | <<locked>> | 80% | 58,987 psi | 81% | 3422 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 41,002 psi | 57% | 3169 fps | 99.9% |
| Accurate 2200 | <<locked>> | 80% | 53,011 psi | 73% | 3497 fps | 97% |
| Accurate 2230 | <<locked>> | 80% | 53,925 psi | 74% | 3501 fps | 97.6% |
| Accurate 2460 | <<locked>> | 80% | 44,889 psi | 62% | 3274 fps | 99.1% |
| Accurate 2495 | <<locked>> | 80% | 33,040 psi | 46% | 3015 fps | 99% |
| Accurate 2520 | <<locked>> | 80% | 40,074 psi | 55% | 3199 fps | 97.9% |
| Accurate 4064 | <<locked>> | 80% | 31,227 psi | 43% | 2976 fps | 96% |
| Accurate LT-30 | <<locked>> | 80% | 49,777 psi | 69% | 3294 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,140 psi | 69% | 3317 fps | 99.5% |
| ADI APS 450 | <<locked>> | 80% | 57,000 psi | 79% | 2736 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 43,221 psi | 60% | 3274 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 54,201 psi | 75% | 3389 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 44,411 psi | 61% | 3274 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 49,879 psi | 69% | 3409 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,914 psi | 55% | 3169 fps | 96% |
| Alliant AR-Comp | <<locked>> | 80% | 38,696 psi | 53% | 3196 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,180 psi | 64% | 3415 fps | 97% |
| Alliant Power Pro 2000-MR | 57.8 gr | 90% | 48,617 psi | 67% | 3501 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 37,985 psi | 52% | 3156 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,398 psi | 64% | 3304 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 44,106 psi | 61% | 3310 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 92% | 40,843 psi | 56% | 3304 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 55,172 psi | 76% | 3406 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,965 psi | 68% | 3271 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 45,600 psi | 63% | 3333 fps | 95% |
| Bofors RP3 | <<locked>> | 88% | 40,350 psi | 56% | 3228 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,814 psi | 58% | 3179 fps | 97.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,058 psi | 52% | 3166 fps | 96.1% |
| Hodgdon CFE223 | 53.9 gr | 82% | 45,092 psi | 62% | 3399 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 45,513 psi | 63% | 3323 fps | 99.8% |
| Hodgdon H335 | <<locked>> | 80% | 46,630 psi | 64% | 3340 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 94% | 51,271 psi | 71% | 3442 fps | 95.8% |
| Hodgdon H4198 | <<locked>> | 80% | 54,795 psi | 76% | 3415 fps | 100% |
| Hodgdon H4895 | <<locked>> | 82% | 40,727 psi | 56% | 3222 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 39,175 psi | 54% | 3225 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,309 psi | 35% | 1998 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 41,959 psi | 58% | 3235 fps | 95.8% |
| IMR 3031 | <<locked>> | 80% | 36,724 psi | 51% | 3169 fps | 99% |
| IMR 4064 | <<locked>> | 88% | 43,671 psi | 60% | 3255 fps | 95.2% |
| IMR 4166 Enduron | <<locked>> | 96% | 61,482 psi | 85% | 3556 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 47,210 psi | 65% | 3284 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 61,105 psi | 84% | 3448 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 42,264 psi | 58% | 3284 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 39,914 psi | 55% | 3169 fps | 96% |
| Lovex D073.4 | <<locked>> | 80% | 54,665 psi | 75% | 3488 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 44,730 psi | 62% | 3274 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 35,969 psi | 50% | 3104 fps | 96.6% |
| Lovex S053 | <<locked>> | 80% | 59,509 psi | 82% | 3376 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 41,017 psi | 57% | 3150 fps | 95% |
| Lovex S062 | <<locked>> | 84% | 37,869 psi | 52% | 3127 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 52,344 psi | 72% | 3389 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,753 psi | 51% | 3084 fps | 95% |
| Norma 202 | <<locked>> | 80% | 37,043 psi | 51% | 3114 fps | 97.7% |
| Norma 203B | <<locked>> | 88% | 43,381 psi | 60% | 3294 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 88% | 43,279 psi | 60% | 3304 fps | 95.4% |
| Ramshot TAC | <<locked>> | 88% | 52,518 psi | 72% | 3425 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 42,003 psi | 58% | 3245 fps | 95.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,410 psi | 60% | 3222 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,396 psi | 35% | 2041 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,860 psi | 62% | 3291 fps | 98.6% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,767 psi | 77% | 3488 fps | 95% |
| ReloadSwiss RS 52 | 54.8 gr | 88% | 46,412 psi | 64% | 3438 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,447 psi | 49% | 3169 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 40,176 psi | 55% | 3166 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 37,318 psi | 51% | 3094 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 90% | 40,190 psi | 55% | 3215 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 54,665 psi | 75% | 3488 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,969 psi | 50% | 3104 fps | 96.6% |
| Shooters World Precision | <<locked>> | 84% | 37,869 psi | 52% | 3127 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,645 psi | 66% | 3310 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,113 psi | 73% | 3100 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,575 psi | 70% | 3419 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 42,177 psi | 58% | 3284 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,195 psi | 65% | 3327 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 50,546 psi | 70% | 3392 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 41,742 psi | 58% | 3228 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,479 psi | 53% | 3074 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,488 psi | 43% | 2894 fps | 97% |
| Somchem S321 | <<locked>> | 80% | 42,917 psi | 59% | 3255 fps | 97.2% |
| Somchem S335 | <<locked>> | 80% | 38,029 psi | 52% | 3074 fps | 98.6% |
| Somchem S341 | <<locked>> | 84% | 43,352 psi | 60% | 3251 fps | 95.6% |
| Somchem S355 | <<locked>> | 90% | 41,249 psi | 57% | 3228 fps | 95.6% |
| Somchem S365 | <<locked>> | 96% | 36,143 psi | 50% | 3179 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 54,041 psi | 75% | 3327 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,743 psi | 60% | 3192 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,624 psi | 53% | 3087 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 80% | 33,736 psi | 47% | 3031 fps | 99% |
| Vihtavuori N140 | <<locked>> | 80% | 34,882 psi | 48% | 3031 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 88% | 36,927 psi | 51% | 3091 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 39,755 psi | 55% | 3159 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 80% | 33,678 psi | 46% | 3005 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 41,191 psi | 57% | 3186 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 38,754 psi | 53% | 3196 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 41,046 psi | 57% | 3228 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 95 powders for .270 Win. Ackley Improved loaded with the .277 | 87gr | CutEdge ESP Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,816 fps; across all powders the maximum-charge window runs from 2,224 fps to 3,816 fps. Accurate 4064 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (500 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 87.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, ADI AR 2208, Alliant Reloder- TS 15.5 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 52, Hodgdon CFE223 rank at the top here: for .270 Win. Ackley Improved with the .277 | 87gr | CutEdge ESP Raptor 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.