Load Specifications
Load data in caliber .270 Win. with .277 | 130gr | Prvi Partizan SP 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-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 56,391 psi | 90% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,592 psi | 88% | 2894 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2861 fps | 97.7% |
| Accurate 4064 | <<locked>> | 86% | 53,098 psi | 85% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,200 psi | 85% | 2982 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 55,970 psi | 90% | 2972 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,650 psi | 86% | 2923 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 3015 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,940 psi | 88% | 2923 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,188 psi | 90% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,188 psi | 90% | 3100 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,172 psi | 87% | 2949 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,621 psi | 88% | 2969 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,085 psi | 87% | 3045 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,288 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 3005 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,512 psi | 71% | 2884 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,662 psi | 81% | 3071 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,028 psi | 90% | 2992 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,911 psi | 88% | 2966 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,752 psi | 88% | 2940 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,405 psi | 90% | 2904 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,723 psi | 88% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,419 psi | 89% | 2976 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 55,695 psi | 89% | 3035 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 92% | 55,854 psi | 90% | 2995 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 82% | 53,301 psi | 85% | 2933 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,317 psi | 87% | 2969 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,026 psi | 85% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,231 psi | 90% | 3074 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,868 psi | 58% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,375 psi | 87% | 2936 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,577 psi | 86% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,171 psi | 85% | 2907 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,318 psi | 90% | 2940 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 55,100 psi | 88% | 2966 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,376 psi | 90% | 2969 fps | 98.3% |
| IMR 4831 | <<locked>> | 96% | 53,780 psi | 86% | 2976 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 55,985 psi | 90% | 3002 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,940 psi | 88% | 2923 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,304 psi | 90% | 2949 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,129 psi | 88% | 2900 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,214 psi | 85% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,072 psi | 90% | 2963 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 53,780 psi | 86% | 2946 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 54,882 psi | 88% | 2920 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,303 psi | 89% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,838 psi | 86% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,101 psi | 90% | 3018 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 50,096 psi | 80% | 3022 fps | 97.4% |
| Norma URP | <<locked>> | 96% | 55,506 psi | 89% | 3025 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 54,375 psi | 87% | 2979 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,578 psi | 88% | 3025 fps | 98.9% |
| Ramshot TAC | <<locked>> | 82% | 55,071 psi | 88% | 2943 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,882 psi | 88% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,506 psi | 59% | 1883 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,753 psi | 89% | 2959 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,245 psi | 89% | 3038 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,911 psi | 88% | 3071 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 52,982 psi | 85% | 3005 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,796 psi | 89% | 3094 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 55,666 psi | 89% | 2897 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,419 psi | 89% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,795 psi | 88% | 2956 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2986 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 92% | 54,752 psi | 88% | 2940 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,072 psi | 90% | 2963 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,304 psi | 90% | 2949 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,214 psi | 85% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,780 psi | 86% | 2946 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,982 psi | 85% | 2963 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,650 psi | 86% | 2917 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,491 psi | 87% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,912 psi | 90% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,258 psi | 85% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,188 psi | 90% | 2913 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,069 psi | 83% | 2979 fps | 96.3% |
| Somchem S335 | <<locked>> | 84% | 55,550 psi | 89% | 2851 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,432 psi | 86% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,100 psi | 88% | 2956 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,259 psi | 87% | 3028 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2966 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 84% | 56,304 psi | 90% | 2835 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,506 psi | 89% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,854 psi | 90% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,837 psi | 85% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,447 psi | 87% | 2969 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,347 psi | 89% | 2920 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,317 psi | 87% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,635 psi | 86% | 2972 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,559 psi | 79% | 2966 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,302 psi | 87% | 2940 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,738 psi | 89% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,028 psi | 90% | 3041 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,958 psi | 64% | 2907 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,665 psi | 88% | 2953 fps | 100% |
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% | 46,354 psi | 74% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,831 psi | 72% | 2723 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 38,450 psi | 62% | 2684 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 43,845 psi | 70% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,692 psi | 52% | 2566 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 49,356 psi | 79% | 2864 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 42,076 psi | 67% | 2710 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 51,169 psi | 82% | 2956 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,430 psi | 82% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,692 psi | 84% | 2844 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,498 psi | 73% | 2910 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,134 psi | 68% | 2733 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,976 psi | 72% | 2802 fps | 99.1% |
| Alliant Reloder-16 | 44.9 gr | 80% | 32,605 psi | 52% | 2579 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,622 psi | 59% | 2710 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,314 psi | 81% | 2943 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,429 psi | 49% | 2543 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,317 psi | 57% | 2730 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,892 psi | 78% | 2871 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 42,003 psi | 67% | 2740 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,411 psi | 73% | 2769 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,866 psi | 85% | 2851 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,937 psi | 82% | 2894 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,598 psi | 68% | 2743 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 42,757 psi | 69% | 2799 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 86% | 46,079 psi | 74% | 2822 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 49,908 psi | 80% | 2874 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,066 psi | 48% | 2474 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,354 psi | 74% | 2851 fps | 99.9% |
| Hodgdon Superformance | 56.3 gr | 88% | 45,353 psi | 73% | 2877 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 43% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,892 psi | 77% | 2825 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 50,270 psi | 81% | 2864 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,222 psi | 71% | 2746 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,615 psi | 75% | 2772 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 45,774 psi | 73% | 2799 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,208 psi | 71% | 2749 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 33,982 psi | 54% | 2582 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 46,137 psi | 74% | 2831 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 51,430 psi | 82% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,182 psi | 79% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,965 psi | 79% | 2795 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 44,324 psi | 71% | 2749 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,914 psi | 62% | 2641 fps | 95.8% |
| Lovex S070 | <<locked>> | 86% | 41,814 psi | 67% | 2720 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 48,341 psi | 78% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,950 psi | 78% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,367 psi | 71% | 2789 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 48,907 psi | 78% | 2894 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 43,642 psi | 70% | 2894 fps | 95.6% |
| Norma URP | <<locked>> | 82% | 35,259 psi | 57% | 2628 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 44,237 psi | 71% | 2802 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 39,073 psi | 63% | 2726 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 51,430 psi | 82% | 2881 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,430 psi | 82% | 2904 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,902 psi | 69% | 2730 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,037 psi | 77% | 2917 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,957 psi | 62% | 2779 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,708 psi | 56% | 2641 fps | 95.5% |
| ReloadSwiss RS 70 | 51.6 gr | 84% | 36,854 psi | 59% | 2707 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 52,417 psi | 84% | 2848 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,151 psi | 74% | 2766 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,537 psi | 63% | 2684 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 49,269 psi | 79% | 2927 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 45,411 psi | 73% | 2769 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,914 psi | 62% | 2641 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,182 psi | 79% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,324 psi | 71% | 2749 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,814 psi | 67% | 2720 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,524 psi | 65% | 2733 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,183 psi | 80% | 2861 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,834 psi | 77% | 2831 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,385 psi | 79% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,452 psi | 66% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,410 psi | 70% | 2690 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,834 psi | 78% | 2920 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 49,110 psi | 79% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,734 psi | 80% | 2851 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 40,132 psi | 64% | 2687 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 29,573 psi | 47% | 2520 fps | 97.3% |
| Somchem S385 | <<locked>> | 94% | 43,859 psi | 70% | 2792 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 49,850 psi | 80% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,876 psi | 74% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,296 psi | 74% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,218 psi | 61% | 2618 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 34,214 psi | 55% | 2569 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 51,735 psi | 83% | 2864 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,657 psi | 72% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,750 psi | 54% | 2569 fps | 95% |
| Vihtavuori N555 | <<locked>> | 86% | 31,125 psi | 50% | 2566 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,765 psi | 54% | 2543 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 52,156 psi | 84% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,757 psi | 69% | 2799 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,819 psi | 46% | 2569 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,616 psi | 76% | 2838 fps | 99.9% |
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 115 powders for .270 Win. loaded with the .277 | 130gr | Prvi Partizan SP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,100 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.277" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 130gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.