Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 90gr | Impala LWHV LS bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, 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.
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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>> | 82% | 58,073 psi | 89% | 3537 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,059 psi | 89% | 3537 fps | 96.7% |
| Accurate 3100 | <<locked>> | 98% | 54,998 psi | 85% | 3507 fps | 98% |
| Accurate 4064 | <<locked>> | 84% | 58,262 psi | 90% | 3586 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,767 psi | 86% | 3596 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 86% | 56,826 psi | 87% | 3586 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,333 psi | 87% | 3707 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,073 psi | 89% | 3619 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,218 psi | 90% | 3645 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,347 psi | 85% | 3652 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,072 psi | 88% | 3681 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 3648 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,418 psi | 84% | 3589 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,761 psi | 74% | 3478 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,477 psi | 85% | 3668 fps | 99.4% |
| Bofors RP3 | <<locked>> | 84% | 55,970 psi | 86% | 3579 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 3648 fps | 96.3% |
| Bofors RP7 | <<locked>> | 90% | 58,668 psi | 90% | 3593 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,246 psi | 87% | 3583 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 90% | 57,363 psi | 88% | 3632 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 88% | 56,246 psi | 87% | 3583 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,999 psi | 86% | 3563 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,898 psi | 88% | 3632 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 58,581 psi | 90% | 3655 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 56% | 2493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,971 psi | 88% | 3602 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 56,086 psi | 86% | 3573 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,288 psi | 85% | 3530 fps | 96.9% |
| IMR 4350 | <<locked>> | 92% | 56,202 psi | 86% | 3547 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,362 psi | 87% | 3560 fps | 97.1% |
| IMR 4831 | <<locked>> | 92% | 55,883 psi | 86% | 3576 fps | 99.3% |
| IMR 4895 | <<locked>> | 82% | 55,970 psi | 86% | 3622 fps | 99.7% |
| Lovex S060 | <<locked>> | 82% | 57,246 psi | 88% | 3563 fps | 99.8% |
| Lovex S062 | <<locked>> | 84% | 56,840 psi | 87% | 3576 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,101 psi | 88% | 3563 fps | 98.5% |
| Lovex S070 | <<locked>> | 90% | 55,245 psi | 85% | 3540 fps | 97.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,791 psi | 75% | 3396 fps | 96.6% |
| Norma 201 | <<locked>> | 82% | 58,218 psi | 90% | 3602 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,508 psi | 90% | 3596 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,551 psi | 89% | 3625 fps | 99.8% |
| Norma MRP | <<locked>> | 98% | 57,682 psi | 89% | 3681 fps | 97.8% |
| Norma URP | <<locked>> | 92% | 57,435 psi | 88% | 3629 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 82% | 54,868 psi | 84% | 3573 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 56,753 psi | 87% | 3612 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 57% | 2549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,796 psi | 86% | 3547 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,318 psi | 87% | 3684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,753 psi | 86% | 3599 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,957 psi | 89% | 3688 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,347 psi | 85% | 3543 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,101 psi | 86% | 3573 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 90% | 58,668 psi | 90% | 3593 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,101 psi | 88% | 3563 fps | 98.5% |
| Shooters World Precision | <<locked>> | 84% | 56,840 psi | 87% | 3576 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,245 psi | 85% | 3540 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,450 psi | 88% | 3622 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,783 psi | 89% | 3602 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,146 psi | 89% | 3530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,999 psi | 86% | 3461 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,087 psi | 88% | 3501 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,479 psi | 90% | 3632 fps | 96.3% |
| Somchem S335 | <<locked>> | 82% | 58,407 psi | 90% | 3520 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 55,666 psi | 86% | 3566 fps | 99.8% |
| Somchem S365 | <<locked>> | 94% | 57,232 psi | 88% | 3635 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,362 psi | 87% | 3547 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 82% | 58,465 psi | 90% | 3507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 55,274 psi | 85% | 3510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,651 psi | 86% | 3507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,246 psi | 88% | 3537 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,753 psi | 86% | 3560 fps | 99.1% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,695 psi | 86% | 3504 fps | 96.3% |
| Vihtavuori N540 | <<locked>> | 84% | 58,059 psi | 89% | 3550 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,550 psi | 85% | 3563 fps | 99% |
| Vihtavuori N555 | <<locked>> | 98% | 57,261 psi | 88% | 3632 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,028 psi | 86% | 3510 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,537 psi | 89% | 3632 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,299 psi | 77% | 3645 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,334 psi | 90% | 3615 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% | 54,375 psi | 84% | 3481 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,894 psi | 78% | 3409 fps | 95% |
| Accurate 3100 | <<locked>> | 92% | 44,672 psi | 69% | 3310 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,256 psi | 79% | 3474 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,436 psi | 61% | 3258 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,094 psi | 72% | 3402 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,330 psi | 81% | 3635 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,863 psi | 74% | 3438 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,184 psi | 79% | 3517 fps | 98.9% |
| Alliant Reloder-16 | 80.9 gr | 82% | 39,943 psi | 61% | 3317 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,859 psi | 66% | 3402 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 53,954 psi | 83% | 3583 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 34,316 psi | 53% | 3143 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 41,858 psi | 64% | 3337 fps | 95.2% |
| Alliant Reloder-26 | 95.9 gr | 88% | 41,046 psi | 63% | 3363 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,921 psi | 75% | 3455 fps | 99.5% |
| Bofors RP5 | <<locked>> | 98% | 53,954 psi | 83% | 3583 fps | 95.4% |
| Bofors RP7 | <<locked>> | 86% | 51,692 psi | 80% | 3465 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 49,052 psi | 75% | 3448 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 50,024 psi | 77% | 3494 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 52,823 psi | 81% | 3517 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,143 psi | 54% | 3133 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,142 psi | 82% | 3566 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 50,299 psi | 77% | 3504 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 2264 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,447 psi | 82% | 3540 fps | 99.7% |
| IMR 4064 | <<locked>> | 80% | 49,487 psi | 76% | 3451 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,909 psi | 80% | 3468 fps | 96.1% |
| IMR 4350 | <<locked>> | 88% | 49,516 psi | 76% | 3422 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,719 psi | 77% | 3435 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 40,132 psi | 62% | 3258 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 52,533 psi | 81% | 3560 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 53,954 psi | 83% | 3510 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 50,212 psi | 77% | 3461 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 44,599 psi | 69% | 3323 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 48,733 psi | 75% | 3415 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 45,803 psi | 70% | 3333 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 54,621 psi | 84% | 3543 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 54,897 psi | 84% | 3543 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,604 psi | 78% | 3504 fps | 99.1% |
| Norma MRP | <<locked>> | 94% | 50,009 psi | 77% | 3537 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 41,234 psi | 63% | 3307 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,140 psi | 79% | 3507 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 46,253 psi | 71% | 3412 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 42% | 2313 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,907 psi | 75% | 3415 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,324 psi | 70% | 3484 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 41,974 psi | 65% | 3327 fps | 95.9% |
| ReloadSwiss RS 70 | 90.7 gr | 84% | 43,613 psi | 67% | 3396 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,083 psi | 80% | 3484 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 46,093 psi | 71% | 3389 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 51,692 psi | 80% | 3465 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 44,599 psi | 69% | 3323 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 50,212 psi | 77% | 3461 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 48,733 psi | 75% | 3415 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,891 psi | 72% | 3432 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,099 psi | 83% | 3543 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,694 psi | 84% | 3478 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,470 psi | 72% | 3304 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 50,067 psi | 77% | 3373 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,679 psi | 84% | 3566 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 54,882 psi | 84% | 3465 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,064 psi | 71% | 3386 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 35,143 psi | 54% | 3186 fps | 97.2% |
| Somchem S385 | <<locked>> | 92% | 49,327 psi | 76% | 3419 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 55,027 psi | 85% | 3461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,924 psi | 80% | 3461 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,243 psi | 80% | 3455 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,077 psi | 68% | 3304 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 39,958 psi | 61% | 3241 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 98% | 52,098 psi | 80% | 3442 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 50,966 psi | 78% | 3435 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,798 psi | 61% | 3241 fps | 95% |
| Vihtavuori N555 | <<locked>> | 86% | 38,203 psi | 59% | 3245 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,523 psi | 61% | 3192 fps | 97.9% |
| Winchester 760 | <<locked>> | 86% | 50,183 psi | 77% | 3497 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 33,344 psi | 51% | 3182 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,534 psi | 84% | 3553 fps | 99.8% |
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 99 powders for .300 Rem. Ultra Mag. loaded with the .308 | 90gr | Impala LWHV LS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,707 fps; across all powders the maximum-charge window runs from 2,493 fps to 3,707 fps. ADI AR 2213 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. ADI AR 2213, Alliant Reloder-22, Alliant Reloder-23 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-26, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 90gr | Impala LWHV LS 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.