Load Specifications
Load data in caliber .264 Leroy N.E. with .264 | 85gr | Hammer Hunter 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, Hodgdon CFE223 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.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 56,217 psi | 88% | 3301 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,347 psi | 88% | 3409 fps | 98.5% |
| Accurate 2460 | <<locked>> | 86% | 55,071 psi | 86% | 3323 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,319 psi | 90% | 3363 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,694 psi | 86% | 3369 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,694 psi | 86% | 3369 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 57,203 psi | 90% | 3409 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,774 psi | 72% | 3268 fps | 96.2% |
| Accurate LT-30 | <<locked>> | 84% | 55,999 psi | 88% | 3245 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,420 psi | 88% | 3271 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,564 psi | 87% | 3392 fps | 99% |
| ADI AR 2207 | <<locked>> | 82% | 57,479 psi | 90% | 3271 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 56,362 psi | 88% | 3379 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 84% | 56,797 psi | 89% | 3379 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,592 psi | 86% | 3343 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 90% | 54,418 psi | 85% | 3337 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,188 psi | 88% | 3474 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,911 psi | 86% | 3501 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,622 psi | 87% | 3402 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,985 psi | 88% | 3317 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,536 psi | 89% | 3428 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,774 psi | 72% | 3278 fps | 96.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3465 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,317 psi | 87% | 3232 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,317 psi | 87% | 3396 fps | 98.2% |
| Bofors RP3 | <<locked>> | 98% | 56,086 psi | 88% | 3415 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,898 psi | 89% | 3333 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 57,609 psi | 90% | 3438 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,376 psi | 87% | 3478 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 88% | 54,476 psi | 85% | 3343 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,289 psi | 88% | 3376 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,230 psi | 85% | 3366 fps | 97.4% |
| Hodgdon H4198 | <<locked>> | 84% | 57,508 psi | 90% | 3297 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 56,057 psi | 88% | 3409 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,901 psi | 66% | 3146 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,534 psi | 85% | 3428 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,403 psi | 54% | 2083 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 56,144 psi | 88% | 3386 fps | 99.4% |
| IMR 3031 | <<locked>> | 96% | 56,492 psi | 89% | 3422 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,636 psi | 86% | 3343 fps | 98.6% |
| IMR 4198 | <<locked>> | 86% | 56,115 psi | 88% | 3271 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 54,418 psi | 85% | 3409 fps | 99% |
| IMR 8208 XBR | <<locked>> | 90% | 54,592 psi | 86% | 3343 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 86% | 55,027 psi | 86% | 3330 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 54,694 psi | 86% | 3369 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,593 psi | 87% | 3314 fps | 99% |
| Lovex S062 | <<locked>> | 96% | 55,187 psi | 86% | 3363 fps | 99.7% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 3278 fps | 95.9% |
| Norma 200 | <<locked>> | 82% | 55,999 psi | 88% | 3287 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,450 psi | 90% | 3389 fps | 99.8% |
| Norma 202 | <<locked>> | 92% | 54,592 psi | 86% | 3346 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,622 psi | 87% | 3412 fps | 99.1% |
| Norma URPᴾ | <<locked>> | 100% | 45,890 psi | 72% | 3264 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 96% | 56,318 psi | 88% | 3438 fps | 99.1% |
| Ramshot TAC | <<locked>> | 90% | 55,477 psi | 87% | 3350 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,549 psi | 85% | 3376 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,405 psi | 88% | 3346 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,664 psi | 54% | 2133 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,215 psi | 85% | 3330 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,897 psi | 86% | 3340 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,507 psi | 89% | 3504 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3543 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 54,911 psi | 86% | 3323 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,404 psi | 85% | 3327 fps | 99.6% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3406 fps | 99.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,227 psi | 80% | 3278 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,694 psi | 86% | 3369 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,187 psi | 86% | 3363 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,433 psi | 85% | 3294 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,825 psi | 87% | 2969 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 57,217 psi | 90% | 3386 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,128 psi | 85% | 3409 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,000 psi | 89% | 3340 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,450 psi | 90% | 3383 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 57,421 psi | 90% | 3412 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,173 psi | 88% | 3278 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,043 psi | 88% | 3268 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 56,144 psi | 88% | 3383 fps | 99.8% |
| Somchem S335 | <<locked>> | 92% | 55,187 psi | 86% | 3274 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,579 psi | 89% | 3373 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3406 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,698 psi | 64% | 3196 fps | 98.2% |
| Unknown powderᴾ | <<locked>> | 100% | 50,401 psi | 79% | 3343 fps | 96.5% |
| Vihtavuori N120 | <<locked>> | 82% | 57,232 psi | 90% | 3209 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 56,086 psi | 88% | 3255 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,014 psi | 88% | 3264 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 57,595 psi | 90% | 3360 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,940 psi | 86% | 3314 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3330 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,414 psi | 76% | 3268 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 90% | 55,390 psi | 87% | 3346 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 96% | 56,942 psi | 89% | 3363 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 3271 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,763 psi | 78% | 3251 fps | 98.8% |
| Winchester 748 | <<locked>> | 88% | 55,376 psi | 87% | 3409 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,506 psi | 87% | 3392 fps | 99.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 40,944 psi | 64% | 3031 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,489 psi | 82% | 3340 fps | 97.9% |
| Accurate 2460 | <<locked>> | 80% | 44,672 psi | 70% | 3140 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 33,707 psi | 53% | 2917 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 38,493 psi | 60% | 3051 fps | 98.5% |
| Accurate 2520 | <<locked>> | 80% | 38,493 psi | 60% | 3051 fps | 98.5% |
| Accurate 4064 | <<locked>> | 80% | 31,836 psi | 50% | 2887 fps | 97.7% |
| Accurate 4350 | <<locked>> | 98% | 42,714 psi | 67% | 3205 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 49,516 psi | 78% | 3140 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,879 psi | 78% | 3159 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 80% | 37,826 psi | 59% | 3022 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 53,911 psi | 84% | 3219 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 41,394 psi | 65% | 3084 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 49,603 psi | 78% | 3261 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,842 psi | 62% | 3045 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 80% | 38,667 psi | 61% | 3064 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,977 psi | 72% | 3274 fps | 98% |
| Alliant Power Pro 2000-MR | 42.7 gr | 86% | 41,901 psi | 66% | 3219 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,549 psi | 56% | 2982 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,615 psi | 73% | 3159 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,104 psi | 64% | 3120 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 43,047 psi | 67% | 3215 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 37,884 psi | 59% | 3120 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,617 psi | 76% | 3123 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,076 psi | 66% | 3133 fps | 95.3% |
| Bofors RP3 | <<locked>> | 84% | 35,041 psi | 55% | 2982 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,829 psi | 66% | 3048 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,927 psi | 59% | 3051 fps | 97.4% |
| Hodgdon CFE223 | 40.6 gr | 80% | 41,510 psi | 65% | 3192 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 42,018 psi | 66% | 3114 fps | 99.8% |
| Hodgdon H335 | <<locked>> | 80% | 49,052 psi | 77% | 3255 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 44,193 psi | 69% | 3173 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 51,155 psi | 80% | 3192 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 38,116 psi | 60% | 3035 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,854 psi | 58% | 3022 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 34,185 psi | 54% | 2979 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,614 psi | 40% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 36,245 psi | 57% | 2969 fps | 95.2% |
| IMR 3031 | <<locked>> | 80% | 33,489 psi | 52% | 2966 fps | 99.2% |
| IMR 4064 | <<locked>> | 88% | 40,219 psi | 63% | 3051 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 46,963 psi | 74% | 3123 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 39,247 psi | 62% | 3091 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 80% | 39,842 psi | 62% | 3045 fps | 97.2% |
| Lovex D073.5 | <<locked>> | 80% | 44,643 psi | 70% | 3143 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 36,100 psi | 57% | 2995 fps | 97.9% |
| Lovex S060 | <<locked>> | 80% | 38,638 psi | 61% | 2966 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 33,475 psi | 52% | 2894 fps | 95.2% |
| Lovex S065 | <<locked>> | 98% | 48,167 psi | 75% | 3219 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 52,649 psi | 83% | 3235 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,101 psi | 58% | 2976 fps | 96.5% |
| Norma 202 | <<locked>> | 80% | 37,115 psi | 58% | 2999 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 37,666 psi | 59% | 3041 fps | 95.2% |
| Norma URP | <<locked>> | 98% | 43,062 psi | 67% | 3202 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 40,147 psi | 63% | 3117 fps | 95.8% |
| Ramshot TAC | <<locked>> | 86% | 48,660 psi | 76% | 3219 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,769 psi | 61% | 3048 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,279 psi | 68% | 3094 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,686 psi | 40% | 1909 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,672 psi | 70% | 3153 fps | 99.2% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 51,285 psi | 80% | 3274 fps | 95% |
| ReloadSwiss RS 52 | 40.4 gr | 84% | 39,813 psi | 62% | 3163 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,980 psi | 49% | 2923 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 40,669 psi | 64% | 3048 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 80% | 35,128 psi | 55% | 2913 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 86% | 34,925 psi | 55% | 2969 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,167 psi | 75% | 3219 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,100 psi | 57% | 2995 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 33,475 psi | 52% | 2894 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,340 psi | 74% | 3166 fps | 98.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,214 psi | 83% | 2933 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,995 psi | 78% | 3268 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 38,914 psi | 61% | 3094 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,949 psi | 74% | 3173 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,543 psi | 73% | 3186 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 38,740 psi | 61% | 3035 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,537 psi | 60% | 2946 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,575 psi | 49% | 2782 fps | 98.2% |
| Somchem S321 | <<locked>> | 80% | 42,728 psi | 67% | 3130 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 38,290 psi | 60% | 2953 fps | 99.4% |
| Somchem S341 | <<locked>> | 82% | 40,059 psi | 63% | 3054 fps | 95.8% |
| Somchem S355 | <<locked>> | 86% | 36,143 psi | 57% | 2986 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 33,692 psi | 53% | 3005 fps | 95.7% |
| Unknown powder | <<locked>> | 98% | 47,326 psi | 74% | 3281 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 53,780 psi | 84% | 3159 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 43,685 psi | 68% | 3045 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,595 psi | 60% | 2953 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,111 psi | 50% | 2867 fps | 99.1% |
| Vihtavuori N140 | <<locked>> | 80% | 35,099 psi | 55% | 2923 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 84% | 32,198 psi | 50% | 2854 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 98% | 45,382 psi | 71% | 3209 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 39,726 psi | 62% | 3038 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 80% | 33,765 psi | 53% | 2897 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 98% | 44,237 psi | 69% | 3202 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 38,014 psi | 60% | 2995 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 41,742 psi | 65% | 3150 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,411 psi | 70% | 3186 fps | 97.8% |
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 .264 Leroy N.E. loaded with the .264 | 85gr | Hammer Hunter. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,543 fps; across all powders the maximum-charge window runs from 2,083 fps to 3,543 fps. Accurate 4350 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 (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.264" calls for a 1:11.5 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for .264 Leroy N.E. with the .264 | 85gr | Hammer Hunter 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.