Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 104gr | CutEdge ESP Raptor bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.
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 2495 | <<locked>> | 84% | 55,259 psi | 85% | 3353 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 58,015 psi | 89% | 3402 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,620 psi | 81% | 3346 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 55,883 psi | 86% | 3406 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 58,059 psi | 89% | 3497 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 55,027 psi | 85% | 3442 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 88% | 56,811 psi | 87% | 3445 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 98% | 55,941 psi | 86% | 3468 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,290 psi | 88% | 3445 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,391 psi | 87% | 3570 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,014 psi | 86% | 3461 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,537 psi | 89% | 3468 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,653 psi | 89% | 3491 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 58,682 psi | 90% | 3570 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,681 psi | 87% | 3533 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,216 psi | 85% | 3448 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,211 psi | 76% | 3376 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,018 psi | 66% | 3255 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 3593 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,680 psi | 86% | 3442 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 58,595 psi | 90% | 3478 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 58,146 psi | 89% | 3451 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,639 psi | 90% | 3432 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 58,030 psi | 89% | 3468 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,303 psi | 85% | 3432 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 92% | 56,710 psi | 87% | 3488 fps | 98% |
| Hodgdon H4350 | <<locked>> | 90% | 56,043 psi | 86% | 3445 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 82% | 55,666 psi | 86% | 3455 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,187 psi | 85% | 3419 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,666 psi | 87% | 3484 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,233 psi | 90% | 3524 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 55% | 2329 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,203 psi | 88% | 3461 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,941 psi | 86% | 3448 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,883 psi | 86% | 3425 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,332 psi | 85% | 3396 fps | 97.5% |
| IMR 4350 | <<locked>> | 94% | 55,825 psi | 86% | 3412 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,289 psi | 87% | 3422 fps | 97.7% |
| IMR 4831 | <<locked>> | 96% | 58,610 psi | 90% | 3484 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 55,303 psi | 85% | 3465 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 57,290 psi | 88% | 3445 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,593 psi | 86% | 3409 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,580 psi | 89% | 3425 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,985 psi | 86% | 3419 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,173 psi | 86% | 3412 fps | 98.8% |
| Lovex S070 | <<locked>> | 94% | 57,740 psi | 89% | 3451 fps | 98.3% |
| Norma 201 | <<locked>> | 84% | 57,261 psi | 88% | 3442 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,117 psi | 89% | 3442 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,898 psi | 88% | 3474 fps | 99.9% |
| Norma 204 | <<locked>> | 94% | 57,145 psi | 88% | 3465 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 56,492 psi | 87% | 3537 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 56,521 psi | 87% | 3481 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 58,537 psi | 90% | 3494 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,898 psi | 86% | 3468 fps | 98.6% |
| Ramshot TAC | <<locked>> | 82% | 58,218 psi | 90% | 3455 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 58,378 psi | 90% | 3481 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,027 psi | 55% | 2379 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,463 psi | 85% | 3406 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,795 psi | 84% | 3501 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,912 psi | 86% | 3540 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 58,639 psi | 90% | 3514 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,450 psi | 88% | 3547 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 57,493 psi | 88% | 3428 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,957 psi | 89% | 3438 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,624 psi | 90% | 3474 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 3501 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 58,146 psi | 89% | 3451 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,173 psi | 86% | 3412 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,593 psi | 86% | 3409 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,985 psi | 86% | 3419 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,740 psi | 89% | 3451 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,884 psi | 88% | 3474 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,942 psi | 88% | 3428 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,653 psi | 89% | 3461 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,073 psi | 89% | 3376 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,898 psi | 86% | 3314 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,376 psi | 87% | 3360 fps | 97.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 3494 fps | 96.9% |
| Somchem S335 | <<locked>> | 84% | 57,885 psi | 89% | 3366 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,594 psi | 87% | 3415 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 58,523 psi | 90% | 3474 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,057 psi | 86% | 3484 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,042 psi | 85% | 3402 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 84% | 58,523 psi | 90% | 3360 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,131 psi | 89% | 3402 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,332 psi | 85% | 3360 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,521 psi | 87% | 3386 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,027 psi | 85% | 3415 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 82% | 58,088 psi | 89% | 3445 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,566 psi | 89% | 3399 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 58,262 psi | 90% | 3474 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,042 psi | 85% | 3468 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,637 psi | 86% | 3373 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,927 psi | 88% | 3494 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,889 psi | 69% | 3412 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 58,218 psi | 90% | 3468 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,724 psi | 86% | 3392 fps | 96.3% |
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% | 48,022 psi | 74% | 3241 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 50,328 psi | 77% | 3271 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 41,989 psi | 65% | 3140 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 45,397 psi | 70% | 3232 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,912 psi | 57% | 3077 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 51,416 psi | 79% | 3379 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 43,555 psi | 67% | 3196 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 96% | 52,112 psi | 80% | 3399 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,563 psi | 82% | 3386 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,457 psi | 75% | 3422 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 52,170 psi | 80% | 3392 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,758 psi | 67% | 3222 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,905 psi | 72% | 3297 fps | 98.6% |
| Alliant Reloder-16 | 75.6 gr | 82% | 36,216 psi | 56% | 3097 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,653 psi | 59% | 3176 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 51,474 psi | 79% | 3383 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 32,285 psi | 50% | 2972 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 40,118 psi | 62% | 3182 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 38,870 psi | 60% | 3196 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,851 psi | 80% | 3376 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 44,063 psi | 68% | 3225 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 47,529 psi | 73% | 3255 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,911 psi | 85% | 3376 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,998 psi | 83% | 3406 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,657 psi | 69% | 3232 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 86% | 45,614 psi | 70% | 3278 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 52,359 psi | 81% | 3379 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 51,967 psi | 80% | 3392 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 33,475 psi | 52% | 2972 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,921 psi | 75% | 3353 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 45,861 psi | 71% | 3291 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 41% | 2103 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,879 psi | 77% | 3337 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 52,272 psi | 80% | 3389 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,716 psi | 70% | 3238 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,414 psi | 75% | 3264 fps | 95.9% |
| IMR 4350 | <<locked>> | 90% | 48,733 psi | 75% | 3281 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 46,209 psi | 71% | 3232 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 38,276 psi | 59% | 3094 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 48,138 psi | 74% | 3337 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 53,563 psi | 82% | 3386 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,605 psi | 79% | 3346 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,575 psi | 78% | 3304 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 45,847 psi | 71% | 3241 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 43,105 psi | 66% | 3163 fps | 95.9% |
| Lovex S070 | <<locked>> | 86% | 44,077 psi | 68% | 3196 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,082 psi | 77% | 3323 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,836 psi | 78% | 3327 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,267 psi | 71% | 3281 fps | 98.9% |
| Norma 204 | <<locked>> | 92% | 53,040 psi | 82% | 3392 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 44,991 psi | 69% | 3310 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 36,985 psi | 57% | 3084 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 47,050 psi | 72% | 3297 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 41,901 psi | 64% | 3196 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 54,331 psi | 84% | 3392 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,244 psi | 83% | 3412 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 41% | 2149 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,947 psi | 69% | 3205 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,807 psi | 78% | 3432 fps | 99.2% |
| ReloadSwiss RS 60 | 79.4 gr | 80% | 41,147 psi | 63% | 3261 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 40,089 psi | 62% | 3163 fps | 96.1% |
| ReloadSwiss RS 70 | 84.7 gr | 84% | 39,349 psi | 61% | 3173 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 53,911 psi | 83% | 3376 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,514 psi | 73% | 3261 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 41,147 psi | 63% | 3156 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 50,372 psi | 78% | 3360 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 47,529 psi | 73% | 3255 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 43,105 psi | 66% | 3163 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,605 psi | 79% | 3346 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,847 psi | 71% | 3241 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 86% | 44,077 psi | 68% | 3196 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,757 psi | 66% | 3212 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,982 psi | 82% | 3363 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,241 psi | 77% | 3337 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,894 psi | 78% | 3271 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,815 psi | 66% | 3100 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 45,701 psi | 70% | 3163 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,722 psi | 83% | 3422 fps | 96% |
| Somchem S335 | <<locked>> | 80% | 50,850 psi | 78% | 3258 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,707 psi | 81% | 3353 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 41,669 psi | 64% | 3163 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 30,777 psi | 47% | 2946 fps | 96.2% |
| Somchem S385 | <<locked>> | 94% | 47,819 psi | 74% | 3268 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,416 psi | 79% | 3258 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,442 psi | 73% | 3241 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,196 psi | 74% | 3245 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,842 psi | 61% | 3084 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 38,464 psi | 59% | 3084 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 54,172 psi | 83% | 3386 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,905 psi | 72% | 3228 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 38,116 psi | 59% | 3081 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 35,708 psi | 55% | 3068 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,723 psi | 55% | 2986 fps | 97.3% |
| Winchester 760 | <<locked>> | 86% | 45,774 psi | 70% | 3281 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,951 psi | 48% | 2999 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,444 psi | 78% | 3340 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,735 psi | 80% | 3323 fps | 95.3% |
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 97 powders for .300 Rem. Ultra Mag. loaded with the .308 | 104gr | CutEdge ESP Raptor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,593 fps; across all powders the maximum-charge window runs from 2,329 fps to 3,593 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 104.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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. ReloadSwiss RS 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 104gr | 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.