Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 125gr | Hornady SST bullet and 88 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-17 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>> | 84% | 55,579 psi | 89% | 3225 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,462 psi | 87% | 3241 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,231 psi | 90% | 3314 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 54,491 psi | 87% | 3291 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,752 psi | 88% | 3366 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,694 psi | 88% | 3320 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 92% | 55,970 psi | 90% | 3317 fps | 99.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,722 psi | 86% | 3271 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 84% | 54,549 psi | 87% | 3258 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,636 psi | 88% | 3442 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,014 psi | 90% | 3346 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,084 psi | 85% | 3307 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 3428 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,650 psi | 86% | 3412 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,089 psi | 64% | 3107 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,107 psi | 72% | 3284 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,810 psi | 88% | 3330 fps | 98.9% |
| Bofors RP3 | <<locked>> | 90% | 53,214 psi | 85% | 3301 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,347 psi | 89% | 3255 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,185 psi | 85% | 3294 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,172 psi | 88% | 3406 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 90% | 54,085 psi | 87% | 3307 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 96% | 53,925 psi | 86% | 3356 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 55,259 psi | 89% | 3333 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,938 psi | 83% | 3287 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,984 psi | 88% | 3366 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,375 psi | 57% | 2103 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,098 psi | 85% | 3278 fps | 99.5% |
| IMR 3031 | <<locked>> | 86% | 55,230 psi | 89% | 3327 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,376 psi | 89% | 3301 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,230 psi | 89% | 3271 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,129 psi | 88% | 3294 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,158 psi | 88% | 3353 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 54,462 psi | 87% | 3343 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 84% | 53,722 psi | 86% | 3271 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 86% | 54,781 psi | 88% | 3297 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,186 psi | 87% | 3241 fps | 99.4% |
| Lovex S062 | <<locked>> | 90% | 55,100 psi | 88% | 3297 fps | 99.9% |
| Lovex S065 | <<locked>> | 96% | 54,549 psi | 87% | 3287 fps | 97.6% |
| Lovex S070 | <<locked>> | 98% | 55,782 psi | 89% | 3327 fps | 96.8% |
| Norma 201 | <<locked>> | 86% | 53,577 psi | 86% | 3264 fps | 99.9% |
| Norma 202 | <<locked>> | 86% | 54,143 psi | 87% | 3271 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,738 psi | 89% | 3353 fps | 99.6% |
| Norma URP | <<locked>> | 98% | 53,708 psi | 86% | 3350 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 88% | 52,866 psi | 85% | 3314 fps | 99.2% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,420 psi | 90% | 3406 fps | 97.7% |
| Ramshot TAC | <<locked>> | 84% | 54,201 psi | 87% | 3278 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,693 psi | 86% | 3297 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,578 psi | 88% | 3264 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 57% | 2152 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,418 psi | 87% | 3284 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,316 psi | 85% | 3376 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,127 psi | 85% | 3415 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,476 psi | 87% | 3383 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,114 psi | 87% | 3409 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 84% | 54,505 psi | 87% | 3255 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,954 psi | 87% | 3261 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 92% | 53,040 psi | 85% | 3287 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,549 psi | 87% | 3287 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,781 psi | 88% | 3297 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,100 psi | 88% | 3297 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 98% | 55,782 psi | 89% | 3327 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,926 psi | 88% | 3356 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,405 psi | 90% | 3317 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,316 psi | 85% | 3284 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,853 psi | 88% | 3205 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,303 psi | 89% | 3202 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,013 psi | 88% | 3232 fps | 96.4% |
| Somchem S321 | <<locked>> | 82% | 55,129 psi | 88% | 3304 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,404 psi | 87% | 3202 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,927 psi | 90% | 3307 fps | 99.5% |
| Somchem S355 | <<locked>> | 92% | 53,287 psi | 85% | 3287 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 3353 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,534 psi | 87% | 3169 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,085 psi | 88% | 3192 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,751 psi | 86% | 3232 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,549 psi | 87% | 3245 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,810 psi | 88% | 3268 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,217 psi | 90% | 3350 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,230 psi | 87% | 3268 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 88% | 53,069 psi | 85% | 3238 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,288 psi | 89% | 3350 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,845 psi | 70% | 3196 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,098 psi | 85% | 3264 fps | 99.8% |
| Winchester 748 | <<locked>> | 84% | 54,186 psi | 87% | 3320 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,143 psi | 87% | 3360 fps | 96.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,027 psi | 58% | 3081 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,098 psi | 85% | 3291 fps | 99.6% |
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% | 48,892 psi | 78% | 3117 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,843 psi | 67% | 3022 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,066 psi | 79% | 3189 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,523 psi | 63% | 3002 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 41,162 psi | 66% | 3094 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 45,194 psi | 72% | 3133 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,406 psi | 62% | 2953 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,253 psi | 76% | 3150 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 47,587 psi | 76% | 3146 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,205 psi | 66% | 3146 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,043 psi | 61% | 2976 fps | 97.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,886 psi | 66% | 3048 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 40,567 psi | 65% | 3104 fps | 95.7% |
| Alliant Reloder-17 | 66.3 gr | 82% | 35,244 psi | 57% | 2986 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 35,157 psi | 56% | 2972 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,018 psi | 67% | 3205 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,570 psi | 71% | 3127 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 37,869 psi | 61% | 2979 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,994 psi | 79% | 3143 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,325 psi | 74% | 3166 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,314 psi | 82% | 3333 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 82% | 41,307 psi | 66% | 3045 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 50,357 psi | 81% | 3284 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,600 psi | 73% | 3146 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 35,143 psi | 56% | 2920 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,800 psi | 67% | 3104 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 42% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,743 psi | 70% | 3091 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 45,179 psi | 72% | 3150 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,292 psi | 65% | 2995 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 51,924 psi | 83% | 3209 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 51,866 psi | 83% | 3232 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 39,639 psi | 64% | 3038 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,872 psi | 67% | 3084 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,253 psi | 76% | 3150 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 80% | 44,512 psi | 71% | 3114 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 45,034 psi | 72% | 3064 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 40,190 psi | 64% | 2999 fps | 98.1% |
| Lovex S065 | <<locked>> | 90% | 45,324 psi | 73% | 3104 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 49,023 psi | 79% | 3199 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 44,309 psi | 71% | 3084 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 44,585 psi | 71% | 3094 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 40,248 psi | 65% | 3035 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 41,162 psi | 66% | 3094 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,900 psi | 64% | 3045 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 46,064 psi | 74% | 3202 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 47,297 psi | 76% | 3143 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,847 psi | 75% | 3169 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,184 psi | 82% | 3202 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,703 psi | 76% | 3156 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,105 psi | 69% | 3166 fps | 97% |
| ReloadSwiss RS 60 | 64.7 gr | 80% | 35,085 psi | 56% | 2995 fps | 98% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,915 psi | 66% | 3107 fps | 95.3% |
| ReloadSwiss RS 70 | 75.6 gr | 92% | 43,903 psi | 70% | 3192 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 48,138 psi | 77% | 3143 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,105 psi | 68% | 3025 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,476 psi | 57% | 2910 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 45,324 psi | 73% | 3104 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,512 psi | 71% | 3114 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 40,190 psi | 64% | 2999 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 94% | 49,023 psi | 79% | 3199 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,492 psi | 59% | 2963 fps | 95.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,701 psi | 73% | 3114 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,729 psi | 70% | 3091 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,585 psi | 73% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,971 psi | 61% | 2881 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 51,605 psi | 83% | 3173 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 51,387 psi | 82% | 3238 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 45,252 psi | 73% | 3041 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,411 psi | 73% | 3110 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 36,390 psi | 58% | 2923 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 32,227 psi | 52% | 2897 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 51,387 psi | 82% | 3120 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,905 psi | 74% | 3038 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,611 psi | 67% | 3015 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,163 psi | 68% | 3018 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 34,519 psi | 55% | 2848 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 40,292 psi | 65% | 3031 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 47,442 psi | 76% | 3143 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 40,683 psi | 65% | 2999 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 42,351 psi | 68% | 3094 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 38,334 psi | 61% | 3064 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 35,201 psi | 56% | 2874 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 47,253 psi | 76% | 3192 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 50,560 psi | 81% | 3291 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,692 psi | 54% | 2999 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,395 psi | 70% | 3097 fps | 98.2% |
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 88 powders for .300 Win. Mag. loaded with the .308 | 125gr | Hornady SST. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,442 fps; across all powders the maximum-charge window runs from 2,103 fps to 3,442 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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-17, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 125gr | Hornady SST 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.