Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 125gr | Sierra MatchKing bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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% | 53,722 psi | 86% | 3189 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,738 psi | 89% | 3264 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,086 psi | 90% | 3261 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,375 psi | 87% | 3278 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 55,869 psi | 90% | 3307 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 3379 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 56,391 psi | 90% | 3340 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 92% | 54,085 psi | 87% | 3278 fps | 98.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,376 psi | 89% | 3291 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 56,231 psi | 90% | 3278 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,420 psi | 90% | 3465 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,027 psi | 87% | 3304 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,505 psi | 87% | 3323 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,548 psi | 86% | 3379 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,056 psi | 88% | 3428 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,421 psi | 62% | 3058 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 52,823 psi | 85% | 3284 fps | 98.4% |
| Bofors RP3 | <<locked>> | 92% | 54,781 psi | 88% | 3320 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,795 psi | 86% | 3219 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,911 psi | 88% | 3317 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,084 psi | 85% | 3356 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 82% | 55,927 psi | 90% | 3294 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,709 psi | 89% | 3327 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 98% | 55,317 psi | 89% | 3373 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 53,417 psi | 86% | 3291 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,951 psi | 80% | 3245 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 52,953 psi | 85% | 3323 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,128 psi | 56% | 2083 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,752 psi | 88% | 3297 fps | 99.6% |
| IMR 3031 | <<locked>> | 86% | 53,287 psi | 85% | 3291 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,664 psi | 86% | 3261 fps | 99% |
| IMR 4198 | <<locked>> | 82% | 56,318 psi | 90% | 3209 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 3307 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 55,912 psi | 90% | 3363 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 86% | 55,376 psi | 89% | 3291 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 55,724 psi | 89% | 3274 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,275 psi | 90% | 3317 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,115 psi | 90% | 3264 fps | 99.5% |
| Lovex S062 | <<locked>> | 90% | 53,330 psi | 86% | 3261 fps | 99.8% |
| Lovex S065 | <<locked>> | 98% | 56,115 psi | 90% | 3304 fps | 97.7% |
| Lovex S070 | <<locked>> | 98% | 53,635 psi | 86% | 3274 fps | 96.1% |
| Norma 201 | <<locked>> | 88% | 55,143 psi | 88% | 3284 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 55,753 psi | 89% | 3291 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,751 psi | 86% | 3307 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 55,042 psi | 88% | 3366 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 90% | 54,462 psi | 87% | 3333 fps | 99.3% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,911 psi | 86% | 3350 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 56,086 psi | 90% | 3301 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,448 psi | 89% | 3323 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,011 psi | 85% | 3225 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 57% | 2133 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,926 psi | 88% | 3274 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,202 psi | 90% | 3307 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,998 psi | 88% | 3399 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,636 psi | 88% | 3435 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 3399 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,912 psi | 90% | 3432 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 86% | 55,941 psi | 90% | 3271 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,579 psi | 89% | 3278 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 54,621 psi | 88% | 3310 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,115 psi | 90% | 3304 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,275 psi | 90% | 3317 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,330 psi | 86% | 3261 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 98% | 53,635 psi | 86% | 3274 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,420 psi | 90% | 3376 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,346 psi | 87% | 3271 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,998 psi | 88% | 3307 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,388 psi | 86% | 3173 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,577 psi | 86% | 3166 fps | 100% |
| Somchem S321 | <<locked>> | 82% | 53,200 psi | 85% | 3261 fps | 99.8% |
| Somchem S335 | <<locked>> | 88% | 56,057 psi | 90% | 3219 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,867 psi | 86% | 3264 fps | 99.2% |
| Somchem S355 | <<locked>> | 94% | 54,868 psi | 88% | 3307 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,371 psi | 79% | 3307 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 84% | 56,231 psi | 90% | 3189 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,606 psi | 86% | 3159 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,259 psi | 89% | 3251 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,333 psi | 90% | 3264 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,405 psi | 90% | 3287 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,969 psi | 87% | 3301 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 86% | 55,912 psi | 90% | 3291 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 90% | 54,607 psi | 88% | 3255 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,171 psi | 85% | 3304 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,698 psi | 67% | 3143 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,868 psi | 88% | 3284 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 55,854 psi | 90% | 3340 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,550 psi | 89% | 3376 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,868 psi | 88% | 3310 fps | 99.7% |
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% | 47,456 psi | 76% | 3084 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,214 psi | 84% | 3205 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,219 psi | 64% | 2982 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,152 psi | 76% | 3146 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 37,985 psi | 61% | 2963 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 42,177 psi | 68% | 3110 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 43,801 psi | 70% | 3094 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 39,668 psi | 64% | 2976 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,832 psi | 73% | 3110 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 45,788 psi | 73% | 3114 fps | 100% |
| Alliant Power Pro 2000-MR | 63.6 gr | 80% | 39,842 psi | 64% | 3100 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,695 psi | 59% | 2936 fps | 96.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,508 psi | 63% | 3009 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,640 psi | 67% | 3120 fps | 95.8% |
| Alliant Reloder-17 | 65.7 gr | 84% | 36,390 psi | 58% | 3009 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,998 psi | 58% | 2989 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,033 psi | 69% | 3084 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 36,332 psi | 58% | 2933 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,630 psi | 76% | 3107 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,773 psi | 72% | 3127 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,400 psi | 79% | 3287 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 52,359 psi | 84% | 3235 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 42,641 psi | 68% | 3068 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 96% | 51,764 psi | 83% | 3307 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 44,179 psi | 71% | 3107 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,882 psi | 58% | 2930 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,089 psi | 64% | 3061 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,150 psi | 42% | 1867 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,395 psi | 68% | 3051 fps | 97.7% |
| IMR 3031 | <<locked>> | 80% | 43,700 psi | 70% | 3117 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,957 psi | 62% | 2953 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 53,171 psi | 85% | 3159 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 40,567 psi | 65% | 3054 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 40,480 psi | 65% | 3045 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 45,832 psi | 73% | 3110 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 51,982 psi | 83% | 3212 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 42,844 psi | 69% | 3071 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 43,714 psi | 70% | 3025 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 38,798 psi | 62% | 2959 fps | 97.6% |
| Lovex S065 | <<locked>> | 92% | 46,528 psi | 75% | 3120 fps | 95.5% |
| Lovex S070 | <<locked>> | 96% | 50,314 psi | 81% | 3212 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,873 psi | 69% | 3045 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 43,120 psi | 69% | 3058 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 38,899 psi | 62% | 2995 fps | 96.2% |
| Norma URP | <<locked>> | 92% | 42,221 psi | 68% | 3110 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 38,537 psi | 62% | 3002 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 96% | 47,123 psi | 76% | 3219 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 45,788 psi | 73% | 3100 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,382 psi | 73% | 3130 fps | 97.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,588 psi | 80% | 3163 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,455 psi | 42% | 1913 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,285 psi | 82% | 3212 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 49,269 psi | 79% | 3176 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,336 psi | 66% | 3120 fps | 96.2% |
| ReloadSwiss RS 60 | 62.6 gr | 80% | 33,837 psi | 54% | 2953 fps | 97.3% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,989 psi | 67% | 3127 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 45,266 psi | 73% | 3212 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 46,760 psi | 75% | 3107 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 40,669 psi | 65% | 2986 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 34,084 psi | 55% | 2867 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 46,528 psi | 75% | 3120 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,844 psi | 69% | 3071 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 38,798 psi | 62% | 2959 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 96% | 50,314 psi | 81% | 3212 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 37,710 psi | 60% | 2989 fps | 95.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,063 psi | 71% | 3068 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,279 psi | 68% | 3051 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,106 psi | 71% | 3005 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,637 psi | 59% | 2841 fps | 99.6% |
| Somchem S321 | <<locked>> | 80% | 49,647 psi | 80% | 3199 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 43,859 psi | 70% | 3005 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,801 psi | 70% | 3071 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 35,070 psi | 56% | 2881 fps | 95.4% |
| Somchem S365 | <<locked>> | 86% | 30,879 psi | 50% | 2848 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 49,792 psi | 80% | 3087 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,396 psi | 71% | 3005 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,987 psi | 64% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,756 psi | 65% | 2982 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 33,286 psi | 53% | 2808 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 90% | 41,263 psi | 66% | 3048 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 45,847 psi | 74% | 3104 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 39,436 psi | 63% | 2963 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 90% | 40,741 psi | 65% | 3048 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 39,088 psi | 63% | 3081 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,982 psi | 54% | 2831 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 45,571 psi | 73% | 3153 fps | 99.5% |
| Winchester 760 | <<locked>> | 96% | 51,764 psi | 83% | 3307 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,742 psi | 67% | 3051 fps | 97.7% |
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 106 powders for .300 Win. Mag. loaded with the .308 | 125gr | Sierra MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,465 fps; across all powders the maximum-charge window runs from 2,083 fps to 3,465 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 Win. Mag. with the .308 | 125gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.