Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 115gr | Lehigh Defense Controlled Chaos bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Alliant Reloder-16.
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% | 58,494 psi | 90% | 3271 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,869 psi | 86% | 3268 fps | 97.9% |
| Accurate 3100 | <<locked>> | 98% | 56,376 psi | 87% | 3304 fps | 99.4% |
| Accurate 4064 | <<locked>> | 82% | 55,303 psi | 85% | 3278 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,334 psi | 88% | 3376 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 58,784 psi | 90% | 3363 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 58,566 psi | 90% | 3412 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 98% | 56,521 psi | 87% | 3396 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,101 psi | 86% | 3330 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,159 psi | 86% | 3353 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,827 psi | 89% | 3438 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,579 psi | 86% | 3399 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 58,204 psi | 90% | 3396 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,072 psi | 86% | 3392 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 3383 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 3297 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 58,204 psi | 90% | 3474 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 3373 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 57,508 psi | 89% | 3346 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,072 psi | 86% | 3392 fps | 97.7% |
| Bofors RP7 | <<locked>> | 88% | 56,608 psi | 87% | 3320 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 57,580 psi | 89% | 3356 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 88% | 55,564 psi | 86% | 3363 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 88% | 58,421 psi | 90% | 3383 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,363 psi | 90% | 3350 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,283 psi | 74% | 3327 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 88% | 56,724 psi | 87% | 3392 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 56% | 2251 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,015 psi | 89% | 3343 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,927 psi | 88% | 3317 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 58,276 psi | 90% | 3350 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,088 psi | 89% | 3350 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 57,841 psi | 89% | 3363 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,624 psi | 89% | 3386 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,624 psi | 89% | 3327 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 58,102 psi | 89% | 3435 fps | 96.8% |
| Lovex S062 | <<locked>> | 84% | 58,247 psi | 90% | 3337 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,624 psi | 90% | 3346 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 56,753 psi | 87% | 3333 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,922 psi | 77% | 3199 fps | 98.5% |
| Norma 203B | <<locked>> | 82% | 55,492 psi | 85% | 3337 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,738 psi | 86% | 3340 fps | 97.1% |
| Norma MRP | <<locked>> | 96% | 55,999 psi | 86% | 3422 fps | 98.8% |
| Norma URP | <<locked>> | 90% | 55,782 psi | 86% | 3356 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 56,811 psi | 87% | 3353 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,766 psi | 84% | 3376 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 90% | 54,955 psi | 85% | 3346 fps | 99.1% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,403 psi | 82% | 3304 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 57% | 2300 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,595 psi | 89% | 3333 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,839 psi | 84% | 3396 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,725 psi | 89% | 3389 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,115 psi | 86% | 3415 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,385 psi | 76% | 3330 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,594 psi | 87% | 3301 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,537 psi | 89% | 3343 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,159 psi | 86% | 3317 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 96% | 57,290 psi | 88% | 3379 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 88% | 56,608 psi | 87% | 3320 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,624 psi | 90% | 3346 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 58,247 psi | 90% | 3337 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,753 psi | 87% | 3333 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,463 psi | 85% | 3340 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,783 psi | 89% | 3222 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,508 psi | 90% | 3291 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,811 psi | 87% | 3373 fps | 97.7% |
| Somchem S355 | <<locked>> | 86% | 57,203 psi | 88% | 3337 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,726 psi | 90% | 3297 fps | 96.1% |
| Somchem S365 | <<locked>> | 92% | 55,767 psi | 86% | 3360 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 58,262 psi | 90% | 3353 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,869 psi | 88% | 3261 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,406 psi | 88% | 3268 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,071 psi | 85% | 3251 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,769 psi | 89% | 3346 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 3320 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 82% | 55,883 psi | 86% | 3258 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,159 psi | 88% | 3350 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 96% | 55,216 psi | 85% | 3356 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 58,334 psi | 90% | 3301 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,738 psi | 86% | 3366 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,896 psi | 83% | 3451 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,665 psi | 84% | 3278 fps | 97.2% |
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% | 54,650 psi | 84% | 3222 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,199 psi | 80% | 3205 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 39,407 psi | 61% | 2986 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 51,735 psi | 80% | 3222 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,972 psi | 62% | 3048 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 80% | 48,428 psi | 75% | 3186 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 90% | 47,572 psi | 73% | 3212 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 52,779 psi | 81% | 3327 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,168 psi | 76% | 3215 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,634 psi | 81% | 3294 fps | 99.8% |
| Alliant Reloder-16 | 75.8 gr | 80% | 38,319 psi | 59% | 3054 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,425 psi | 68% | 3202 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 90% | 47,384 psi | 73% | 3202 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 48,675 psi | 75% | 3258 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 82% | 30,385 psi | 47% | 2825 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 37,521 psi | 58% | 3025 fps | 95.7% |
| Alliant Reloder-26 | 87.9 gr | 84% | 36,071 psi | 56% | 3028 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 47,805 psi | 74% | 3238 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 49,966 psi | 77% | 3225 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 48,675 psi | 75% | 3258 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 43,468 psi | 67% | 3068 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 50,299 psi | 77% | 3235 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 41,872 psi | 64% | 3094 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 82% | 47,776 psi | 74% | 3189 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,911 psi | 55% | 2933 fps | 97.9% |
| Hodgdon Retumbo | <<locked>> | 98% | 44,947 psi | 69% | 3248 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 82% | 44,788 psi | 69% | 3173 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 41% | 2031 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,865 psi | 78% | 3228 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,229 psi | 82% | 3255 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 44,701 psi | 69% | 3104 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,860 psi | 69% | 3104 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 38,261 psi | 59% | 2989 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 54,012 psi | 83% | 3327 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,041 psi | 83% | 3264 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 53,998 psi | 83% | 3363 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 51,314 psi | 79% | 3228 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,453 psi | 65% | 3048 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 40,698 psi | 63% | 3018 fps | 95% |
| Lovex S071 | <<locked>> | 92% | 37,985 psi | 58% | 2949 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 51,996 psi | 80% | 3278 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 48,167 psi | 74% | 3202 fps | 95.2% |
| Norma MRP | 89.4 gr | 88% | 41,568 psi | 64% | 3133 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 39,436 psi | 61% | 3038 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 53,069 psi | 82% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 50,749 psi | 78% | 3301 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 38,522 psi | 59% | 3012 fps | 95% |
| Ramshot Magnum | <<locked>> | 96% | 45,614 psi | 70% | 3156 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 42% | 2077 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,183 psi | 77% | 3209 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,152 psi | 73% | 3268 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,001 psi | 62% | 3058 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,769 psi | 60% | 3061 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 42,395 psi | 65% | 3166 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 53,026 psi | 82% | 3248 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,862 psi | 72% | 3163 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 92% | 52,591 psi | 81% | 3255 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 46,412 psi | 71% | 3182 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 43,468 psi | 67% | 3068 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,453 psi | 65% | 3048 fps | 96.8% |
| Shooters World Precision | <<locked>> | 80% | 51,314 psi | 79% | 3228 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,698 psi | 63% | 3018 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,312 psi | 74% | 3215 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,529 psi | 73% | 3071 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,655 psi | 64% | 2979 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 49,501 psi | 76% | 3245 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 47,021 psi | 72% | 3166 fps | 99.8% |
| Somchem S361 | <<locked>> | 92% | 54,752 psi | 84% | 3235 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 36,056 psi | 55% | 2989 fps | 99.1% |
| Somchem S385 | <<locked>> | 88% | 44,193 psi | 68% | 3097 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 53,156 psi | 82% | 3205 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,621 psi | 83% | 3215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,962 psi | 69% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,944 psi | 63% | 3041 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 94% | 46,920 psi | 72% | 3133 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 52,243 psi | 80% | 3202 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,582 psi | 62% | 3038 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 33,895 psi | 52% | 2917 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,466 psi | 62% | 2999 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 42,032 psi | 65% | 3097 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 29,066 psi | 45% | 2851 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 92% | 47,166 psi | 73% | 3143 fps | 95.2% |
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 92 powders for .300 Rem. Ultra Mag. loaded with the .308 | 115gr | Lehigh Defense Controlled Chaos. Alliant Reloder-26 delivers the highest muzzle velocity at 3,474 fps; across all powders the maximum-charge window runs from 2,251 fps to 3,474 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 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. The 115.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Norma MRP, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 115gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2217, ADI AR 2225 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.