Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 88gr | Inceptor SRR bullet and 92 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 2015 | <<locked>> | 82% | 55,361 psi | 85% | 3537 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,390 psi | 85% | 3543 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,203 psi | 88% | 3609 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,537 psi | 90% | 3570 fps | 96.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,602 psi | 75% | 3422 fps | 96.1% |
| Accurate 4064 | <<locked>> | 88% | 55,840 psi | 86% | 3589 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,030 psi | 89% | 3665 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 84% | 55,376 psi | 85% | 3625 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 90% | 57,130 psi | 88% | 3625 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,783 psi | 89% | 3635 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,013 psi | 85% | 3570 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,608 psi | 87% | 3750 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,580 psi | 89% | 3645 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,943 psi | 89% | 3675 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 98% | 58,769 psi | 90% | 3743 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,724 psi | 87% | 3711 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,600 psi | 70% | 3461 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,737 psi | 83% | 3671 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,391 psi | 87% | 3625 fps | 99.1% |
| Bofors RP3 | <<locked>> | 88% | 54,897 psi | 84% | 3599 fps | 99.8% |
| Bofors RP7 | <<locked>> | 94% | 58,624 psi | 90% | 3622 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,448 psi | 85% | 3566 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,639 psi | 90% | 3658 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,709 psi | 86% | 3609 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 94% | 56,768 psi | 87% | 3652 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 56,014 psi | 86% | 3642 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,013 psi | 85% | 3583 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,869 psi | 88% | 3665 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 94% | 58,682 psi | 90% | 3688 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,012 psi | 54% | 2490 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,580 psi | 89% | 3645 fps | 99.8% |
| IMR 3031 | <<locked>> | 84% | 56,086 psi | 86% | 3642 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,217 psi | 87% | 3606 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,985 psi | 86% | 3573 fps | 96.5% |
| IMR 4350 | <<locked>> | 96% | 56,115 psi | 86% | 3576 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,623 psi | 87% | 3593 fps | 96.7% |
| IMR 4831 | <<locked>> | 98% | 58,537 psi | 90% | 3652 fps | 99.3% |
| IMR 4895 | <<locked>> | 86% | 55,579 psi | 86% | 3648 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 84% | 57,783 psi | 89% | 3635 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,811 psi | 86% | 3593 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,059 psi | 89% | 3612 fps | 99.7% |
| Lovex S062 | <<locked>> | 88% | 56,231 psi | 87% | 3606 fps | 99.9% |
| Lovex S065 | <<locked>> | 94% | 56,521 psi | 87% | 3586 fps | 98% |
| Lovex S070 | <<locked>> | 96% | 58,117 psi | 89% | 3622 fps | 97.4% |
| Norma 201 | <<locked>> | 86% | 57,682 psi | 89% | 3629 fps | 100% |
| Norma 202 | <<locked>> | 86% | 58,465 psi | 90% | 3632 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,174 psi | 88% | 3655 fps | 99.6% |
| Norma URP | <<locked>> | 96% | 56,652 psi | 87% | 3652 fps | 99% |
| Ramshot Big Game | <<locked>> | 86% | 54,752 psi | 84% | 3606 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 96% | 55,927 psi | 86% | 3632 fps | 97.7% |
| Ramshot TAC | <<locked>> | 82% | 54,926 psi | 85% | 3570 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,897 psi | 84% | 3596 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,505 psi | 55% | 2546 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,043 psi | 86% | 3579 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,853 psi | 84% | 3681 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,072 psi | 86% | 3720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,755 psi | 90% | 3681 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,856 psi | 89% | 3717 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 57,754 psi | 89% | 3625 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 58,378 psi | 90% | 3629 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,668 psi | 90% | 3652 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 94% | 58,624 psi | 90% | 3622 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,521 psi | 87% | 3586 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,811 psi | 86% | 3593 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,231 psi | 87% | 3606 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 96% | 58,117 psi | 89% | 3622 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,188 psi | 88% | 3652 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,624 psi | 89% | 3609 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,175 psi | 90% | 3645 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 58,552 psi | 90% | 3573 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,217 psi | 87% | 3501 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,956 psi | 88% | 3527 fps | 97% |
| Somchem S335 | <<locked>> | 86% | 58,450 psi | 90% | 3556 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,392 psi | 88% | 3599 fps | 99.6% |
| Somchem S355 | <<locked>> | 92% | 58,711 psi | 90% | 3652 fps | 99.9% |
| Somchem S365 | <<locked>> | 98% | 55,622 psi | 86% | 3652 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 3556 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 57,769 psi | 89% | 3540 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 55,259 psi | 85% | 3504 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 58,233 psi | 90% | 3593 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,637 psi | 86% | 3547 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,724 psi | 87% | 3563 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,187 psi | 85% | 3586 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 84% | 58,566 psi | 90% | 3635 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,117 psi | 89% | 3586 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,537 psi | 90% | 3648 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 3556 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,188 psi | 86% | 3543 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,288 psi | 85% | 3619 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,942 psi | 88% | 3655 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,481 psi | 64% | 3461 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,610 psi | 90% | 3655 fps | 99.9% |
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 2015 | <<locked>> | 80% | 51,866 psi | 80% | 3481 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,628 psi | 69% | 3360 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,214 psi | 82% | 3547 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,578 psi | 84% | 3504 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 44,947 psi | 69% | 3350 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 42,148 psi | 65% | 3340 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 42,728 psi | 66% | 3373 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 48,414 psi | 75% | 3494 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,901 psi | 63% | 3301 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,575 psi | 78% | 3514 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 51,184 psi | 79% | 3510 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,976 psi | 69% | 3514 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,814 psi | 63% | 3320 fps | 97.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,961 psi | 68% | 3402 fps | 96.9% |
| Alliant Reloder-16 | 83.3 gr | 88% | 41,524 psi | 64% | 3389 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,911 psi | 55% | 3258 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 36,883 psi | 57% | 3245 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 94% | 41,974 psi | 65% | 3415 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,675 psi | 75% | 3484 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 40,857 psi | 63% | 3317 fps | 97.6% |
| Bofors RP7 | <<locked>> | 92% | 54,824 psi | 84% | 3553 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,938 psi | 80% | 3507 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,488 psi | 78% | 3520 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 44,773 psi | 69% | 3392 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 90% | 49,211 psi | 76% | 3507 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 48,950 psi | 75% | 3510 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 35,752 psi | 55% | 3182 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,513 psi | 70% | 3455 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 92% | 54,027 psi | 83% | 3606 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,918 psi | 40% | 2260 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,847 psi | 72% | 3448 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 48,530 psi | 75% | 3517 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,902 psi | 66% | 3346 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,257 psi | 80% | 3504 fps | 95.6% |
| IMR 4350 | <<locked>> | 94% | 52,489 psi | 81% | 3507 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,026 psi | 82% | 3527 fps | 95.8% |
| IMR 4831 | <<locked>> | 88% | 40,973 psi | 63% | 3310 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 45,121 psi | 69% | 3445 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 50,575 psi | 78% | 3514 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 48,138 psi | 74% | 3465 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 47,659 psi | 73% | 3425 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 42,786 psi | 66% | 3346 fps | 98.3% |
| Lovex S065 | <<locked>> | 88% | 46,238 psi | 71% | 3389 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 50,575 psi | 78% | 3484 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,065 psi | 72% | 3438 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 47,674 psi | 73% | 3455 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,323 psi | 67% | 3386 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 42,496 psi | 65% | 3369 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 43,729 psi | 67% | 3392 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 48,341 psi | 74% | 3484 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 51,126 psi | 79% | 3494 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,010 psi | 79% | 3530 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,150 psi | 40% | 2310 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 48,501 psi | 75% | 3438 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,152 psi | 73% | 3533 fps | 97.6% |
| ReloadSwiss RS 60 | 81.6 gr | 80% | 38,290 psi | 59% | 3350 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 43,120 psi | 66% | 3386 fps | 95.8% |
| ReloadSwiss RS 70 | 91.1 gr | 88% | 42,583 psi | 66% | 3396 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 50,720 psi | 78% | 3507 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,614 psi | 69% | 3376 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,145 psi | 59% | 3245 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 54,824 psi | 84% | 3553 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 46,238 psi | 71% | 3389 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,138 psi | 74% | 3465 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 42,786 psi | 66% | 3346 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 92% | 50,575 psi | 78% | 3484 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,769 psi | 61% | 3304 fps | 96.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,559 psi | 76% | 3468 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,195 psi | 73% | 3448 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,950 psi | 74% | 3402 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,132 psi | 62% | 3219 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 49,472 psi | 76% | 3389 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 47,964 psi | 74% | 3389 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,501 psi | 76% | 3465 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 38,885 psi | 60% | 3261 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 32,866 psi | 51% | 3153 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 51,314 psi | 79% | 3488 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 54,041 psi | 83% | 3488 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,399 psi | 74% | 3392 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,179 psi | 68% | 3366 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,179 psi | 70% | 3366 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 57% | 3179 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 86% | 41,336 psi | 64% | 3307 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 50,894 psi | 78% | 3507 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 43,888 psi | 68% | 3340 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 44,034 psi | 68% | 3373 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 94% | 40,799 psi | 63% | 3346 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 35,984 psi | 55% | 3133 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 51,430 psi | 79% | 3556 fps | 99.9% |
| Winchester 760 | <<locked>> | 90% | 49,385 psi | 76% | 3514 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 35,592 psi | 55% | 3284 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,137 psi | 73% | 3448 fps | 98.7% |
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 111 powders for .300 Rem. Ultra Mag. loaded with the .308 | 88gr | Inceptor SRR. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,750 fps; across all powders the maximum-charge window runs from 2,490 fps to 3,750 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 88.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 | 88gr | Inceptor SRR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-19, Alliant Reloder-22, Alliant Reloder-25 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.