Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 135gr | Sierra HPBT MatchKing bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 55,288 psi | 89% | 3114 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,853 psi | 88% | 3143 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,607 psi | 88% | 3192 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,694 psi | 88% | 3133 fps | 96.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,774 psi | 73% | 3068 fps | 96.3% |
| Accurate 4064 | <<locked>> | 88% | 54,969 psi | 88% | 3192 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,303 psi | 89% | 3278 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 84% | 54,766 psi | 88% | 3222 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 90% | 55,854 psi | 90% | 3219 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,476 psi | 86% | 3166 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,578 psi | 88% | 3146 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,665 psi | 88% | 3343 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,188 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,069 psi | 85% | 3205 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,217 psi | 90% | 3343 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,824 psi | 86% | 3317 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,207 psi | 69% | 3097 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,255 psi | 79% | 3291 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,766 psi | 88% | 3232 fps | 99.4% |
| Bofors RP3 | <<locked>> | 88% | 53,345 psi | 86% | 3202 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,359 psi | 86% | 3166 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,926 psi | 88% | 3150 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,229 psi | 85% | 3192 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,230 psi | 87% | 3215 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,695 psi | 89% | 3291 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 96% | 56,159 psi | 90% | 3255 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 84% | 55,332 psi | 89% | 3235 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,275 psi | 90% | 3258 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,332 psi | 89% | 3268 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,737 psi | 88% | 3301 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 2041 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,521 psi | 89% | 3222 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,114 psi | 87% | 3199 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,665 psi | 88% | 3192 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,882 psi | 86% | 3156 fps | 97.1% |
| IMR 4350 | <<locked>> | 96% | 53,867 psi | 86% | 3196 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,998 psi | 88% | 3202 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 3219 fps | 99.2% |
| IMR 4895 | <<locked>> | 86% | 54,418 psi | 87% | 3241 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 82% | 53,476 psi | 86% | 3166 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,853 psi | 88% | 3196 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,940 psi | 86% | 3140 fps | 99.8% |
| Lovex S062 | <<locked>> | 88% | 55,216 psi | 89% | 3199 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,882 psi | 88% | 3199 fps | 98.4% |
| Lovex S070 | <<locked>> | 96% | 55,883 psi | 90% | 3235 fps | 97.7% |
| Norma 201 | <<locked>> | 84% | 53,345 psi | 86% | 3159 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,027 psi | 87% | 3166 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,869 psi | 90% | 3255 fps | 99.9% |
| Norma URP | <<locked>> | 96% | 54,143 psi | 87% | 3261 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 86% | 52,968 psi | 85% | 3215 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 96% | 53,156 psi | 85% | 3251 fps | 97.9% |
| Ramshot TAC | <<locked>> | 82% | 53,737 psi | 86% | 3176 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,577 psi | 86% | 3199 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 58% | 2087 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,215 psi | 87% | 3189 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,577 psi | 86% | 3278 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,519 psi | 86% | 3320 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,172 psi | 88% | 3297 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,317 psi | 87% | 3327 fps | 99% |
| Rottweil R 901 | <<locked>> | 82% | 54,244 psi | 87% | 3150 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,969 psi | 87% | 3163 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,432 psi | 86% | 3196 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 92% | 53,359 psi | 86% | 3166 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,882 psi | 88% | 3199 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,853 psi | 88% | 3196 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,216 psi | 89% | 3199 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,883 psi | 90% | 3235 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,013 psi | 88% | 3258 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,985 psi | 90% | 3215 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,171 psi | 85% | 3182 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,592 psi | 88% | 3100 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,129 psi | 88% | 3094 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,853 psi | 88% | 3143 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 54,099 psi | 87% | 3094 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,811 psi | 89% | 3209 fps | 99.8% |
| Somchem S355 | <<locked>> | 90% | 53,548 psi | 86% | 3192 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 3323 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 3189 fps | 96.1% |
| Unknown powder | <<locked>> | 94% | 55,100 psi | 88% | 3271 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 82% | 56,347 psi | 90% | 3097 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,331 psi | 87% | 3081 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,969 psi | 87% | 3130 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,795 psi | 86% | 3130 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,027 psi | 88% | 3179 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,709 psi | 89% | 3241 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 86% | 53,708 psi | 86% | 3159 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,086 psi | 90% | 3291 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,037 psi | 77% | 3186 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,026 psi | 85% | 3173 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,695 psi | 89% | 3291 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,001 psi | 63% | 3107 fps | 99.1% |
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% | 51,938 psi | 83% | 3064 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,976 psi | 72% | 2976 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,865 psi | 82% | 3130 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 51,256 psi | 82% | 3074 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 42,801 psi | 69% | 3005 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,540 psi | 68% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 36,361 psi | 58% | 2884 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,196 psi | 77% | 3100 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,828 psi | 65% | 2923 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,299 psi | 81% | 3110 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 51,097 psi | 82% | 3094 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,193 psi | 71% | 3133 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,756 psi | 65% | 2949 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,845 psi | 70% | 3025 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 36,013 psi | 58% | 2897 fps | 95.1% |
| Alliant Reloder-17 | 65.4 gr | 80% | 35,476 psi | 57% | 2907 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 33,446 psi | 54% | 2841 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 39,595 psi | 63% | 3064 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,674 psi | 76% | 3100 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 40,712 psi | 65% | 2953 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 49,966 psi | 80% | 3104 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,706 psi | 83% | 3094 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,647 psi | 80% | 3130 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,437 psi | 66% | 2956 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 86% | 45,310 psi | 73% | 3091 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 52,808 psi | 85% | 3196 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,718 psi | 78% | 3114 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 33,127 psi | 53% | 2779 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,235 psi | 68% | 3022 fps | 99% |
| Hodgdon Superformance | <<locked>> | 90% | 47,427 psi | 76% | 3156 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 43% | 1824 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,076 psi | 69% | 2982 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 44,541 psi | 71% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,074 psi | 64% | 2900 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,732 psi | 77% | 3038 fps | 95.6% |
| IMR 4350 | <<locked>> | 94% | 50,662 psi | 81% | 3133 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,762 psi | 78% | 3081 fps | 95.8% |
| IMR 4831 | <<locked>> | 88% | 36,085 psi | 58% | 2861 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 44,962 psi | 72% | 3061 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 50,299 psi | 81% | 3110 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 47,703 psi | 76% | 3074 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,790 psi | 77% | 3028 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 43,076 psi | 69% | 2972 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 42,772 psi | 69% | 2963 fps | 95.8% |
| Lovex S070 | <<locked>> | 90% | 46,282 psi | 74% | 3054 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 47,094 psi | 76% | 3045 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 47,485 psi | 76% | 3051 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,221 psi | 69% | 3012 fps | 98.4% |
| Norma URP | <<locked>> | 84% | 36,463 psi | 58% | 2887 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 42,989 psi | 69% | 3022 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 43,279 psi | 69% | 3054 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 50,241 psi | 81% | 3110 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,038 psi | 80% | 3136 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 43% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,628 psi | 72% | 3002 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,644 psi | 75% | 3146 fps | 98.5% |
| ReloadSwiss RS 60 | 65.4 gr | 80% | 37,724 psi | 60% | 2989 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 38,667 psi | 62% | 2963 fps | 95.6% |
| ReloadSwiss RS 70 | 73.1 gr | 88% | 41,176 psi | 66% | 3041 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 51,024 psi | 82% | 3091 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,802 psi | 72% | 2989 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 38,363 psi | 62% | 2894 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 49,966 psi | 80% | 3104 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,772 psi | 69% | 2963 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,703 psi | 76% | 3074 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,076 psi | 69% | 2972 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 46,282 psi | 74% | 3054 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,349 psi | 63% | 2943 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,849 psi | 78% | 3087 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,673 psi | 75% | 3061 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,240 psi | 77% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,408 psi | 65% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,034 psi | 72% | 2959 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 47,935 psi | 77% | 2992 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,530 psi | 78% | 3081 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 38,957 psi | 62% | 2897 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 28,514 psi | 46% | 2697 fps | 95.2% |
| Somchem S385 | <<locked>> | 98% | 48,646 psi | 78% | 3123 fps | 95.2% |
| Unknown powder | <<locked>> | 84% | 39,508 psi | 63% | 2953 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 53,185 psi | 85% | 3048 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,527 psi | 73% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,628 psi | 72% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,396 psi | 71% | 2969 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,228 psi | 53% | 2730 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 82% | 36,941 psi | 59% | 2861 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 44,121 psi | 71% | 2986 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,536 psi | 60% | 2907 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 34,374 psi | 55% | 2874 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,924 psi | 53% | 2733 fps | 96.1% |
| Winchester 760 | <<locked>> | 86% | 45,310 psi | 73% | 3091 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,937 psi | 51% | 2877 fps | 95.7% |
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 Win. Mag. loaded with the .308 | 135gr | Sierra HPBT MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,041 fps to 3,343 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 (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:15.0 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 135gr | Sierra HPBT MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-22, Alliant Reloder-25, 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.