Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 135gr | IBEX Viper bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, 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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 52,156 psi | 86% | 3127 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 52,214 psi | 86% | 3140 fps | 96.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,211 psi | 81% | 3176 fps | 97.5% |
| Accurate 4064 | <<locked>> | 84% | 52,156 psi | 86% | 3179 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,723 psi | 90% | 3310 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 82% | 53,751 psi | 88% | 3241 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 88% | 54,549 psi | 90% | 3238 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,229 psi | 87% | 3363 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 52,069 psi | 85% | 3215 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 52,286 psi | 86% | 3235 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,911 psi | 90% | 3363 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,678 psi | 86% | 3340 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,607 psi | 90% | 3317 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,818 psi | 75% | 3199 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,083 psi | 86% | 3396 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,258 psi | 87% | 3248 fps | 99.4% |
| Bofors RP3 | <<locked>> | 86% | 53,011 psi | 87% | 3235 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 52,620 psi | 86% | 3192 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 86% | 53,287 psi | 87% | 3238 fps | 99% |
| Hodgdon H414 | <<locked>> | 92% | 53,272 psi | 87% | 3294 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 90% | 53,258 psi | 87% | 3248 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 54,360 psi | 89% | 3255 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 51,822 psi | 85% | 3228 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,853 psi | 88% | 3284 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,214 psi | 87% | 3317 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 59% | 2067 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,969 psi | 90% | 3251 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,578 psi | 90% | 3241 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,056 psi | 89% | 3222 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,693 psi | 88% | 3192 fps | 97.3% |
| IMR 4350 | <<locked>> | 94% | 52,866 psi | 87% | 3219 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,737 psi | 88% | 3219 fps | 97.3% |
| IMR 4831 | <<locked>> | 96% | 54,998 psi | 90% | 3297 fps | 99.6% |
| IMR 4895 | <<locked>> | 84% | 53,563 psi | 88% | 3268 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 82% | 54,143 psi | 89% | 3222 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,808 psi | 87% | 3159 fps | 99.8% |
| Lovex S062 | <<locked>> | 86% | 54,679 psi | 90% | 3225 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,201 psi | 89% | 3228 fps | 98.6% |
| Lovex S070 | <<locked>> | 92% | 51,938 psi | 85% | 3205 fps | 97.3% |
| Norma 201 | <<locked>> | 82% | 53,011 psi | 87% | 3189 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,287 psi | 87% | 3189 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,984 psi | 90% | 3281 fps | 99.9% |
| Norma MRPᴾ | <<locked>> | 100% | 51,184 psi | 84% | 3337 fps | 96.9% |
| Norma URP | <<locked>> | 94% | 53,287 psi | 87% | 3291 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 84% | 51,909 psi | 85% | 3241 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 94% | 51,924 psi | 85% | 3278 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 60% | 2113 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,127 psi | 87% | 3212 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,402 psi | 86% | 3301 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,112 psi | 86% | 3340 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,114 psi | 89% | 3323 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,953 psi | 87% | 3346 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 84% | 53,650 psi | 88% | 3189 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,040 psi | 87% | 3228 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,635 psi | 88% | 3297 fps | 96% |
| Rottweil R 907 | <<locked>> | 90% | 52,620 psi | 86% | 3192 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,201 psi | 89% | 3228 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,143 psi | 89% | 3222 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,679 psi | 90% | 3225 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 51,938 psi | 85% | 3205 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,809 psi | 88% | 3281 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,027 psi | 90% | 3238 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 52,025 psi | 85% | 3202 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,490 psi | 88% | 3114 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,998 psi | 89% | 3114 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,099 psi | 89% | 3166 fps | 97.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,127 psi | 87% | 3291 fps | 95.8% |
| Somchem S335 | <<locked>> | 82% | 53,461 psi | 88% | 3117 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,331 psi | 89% | 3222 fps | 99.9% |
| Somchem S355 | <<locked>> | 88% | 52,953 psi | 87% | 3222 fps | 99.9% |
| Somchem S365 | <<locked>> | 96% | 51,764 psi | 85% | 3297 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,679 psi | 90% | 3278 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 82% | 53,737 psi | 88% | 3097 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,316 psi | 88% | 3150 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,606 psi | 88% | 3159 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,041 psi | 89% | 3192 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 51,967 psi | 85% | 3222 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 51,967 psi | 85% | 3153 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,694 psi | 90% | 3287 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,198 psi | 84% | 3291 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 51,750 psi | 85% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,272 psi | 87% | 3294 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,684 psi | 68% | 3228 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 82% | 52,011 psi | 85% | 3212 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,066 psi | 81% | 3077 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,095 psi | 81% | 3081 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 40,437 psi | 66% | 2992 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,354 psi | 76% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,693 psi | 57% | 2877 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 50,473 psi | 83% | 3182 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 42,975 psi | 71% | 3009 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,514 psi | 76% | 3228 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,395 psi | 71% | 3045 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,224 psi | 76% | 3114 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 35,984 psi | 59% | 2936 fps | 95.7% |
| Alliant Reloder-17 | 64.8 gr | 80% | 38,000 psi | 62% | 3022 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,184 psi | 84% | 3251 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 32,097 psi | 53% | 2841 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 90% | 37,130 psi | 61% | 3045 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,893 psi | 82% | 3186 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 43,845 psi | 72% | 3061 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 46,557 psi | 76% | 3074 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 44,193 psi | 73% | 3058 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 43,888 psi | 72% | 3104 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 50,169 psi | 82% | 3186 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,039 psi | 84% | 3196 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,618 psi | 52% | 2772 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,340 psi | 78% | 3166 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 46,427 psi | 76% | 3182 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 45% | 1850 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,646 psi | 80% | 3133 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,271 psi | 84% | 3189 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,165 psi | 74% | 3051 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,413 psi | 78% | 3068 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 46,818 psi | 77% | 3100 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,194 psi | 74% | 3048 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 35,650 psi | 59% | 2887 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 47,398 psi | 78% | 3150 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 50,778 psi | 83% | 3163 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,821 psi | 82% | 3104 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,803 psi | 75% | 3064 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 40,350 psi | 66% | 2940 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 43,555 psi | 72% | 3031 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 49,980 psi | 82% | 3133 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,009 psi | 82% | 3133 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,629 psi | 75% | 3100 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 44,918 psi | 74% | 3202 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 36,651 psi | 60% | 2930 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 45,484 psi | 75% | 3117 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 42,902 psi | 70% | 3087 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 45% | 1896 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,164 psi | 73% | 3031 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,240 psi | 81% | 3241 fps | 99.2% |
| ReloadSwiss RS 60 | 64.8 gr | 80% | 40,205 psi | 66% | 3091 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,419 psi | 60% | 2946 fps | 95.3% |
| ReloadSwiss RS 70 | 69.1 gr | 84% | 38,290 psi | 63% | 3012 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 47,645 psi | 78% | 3077 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 41,466 psi | 68% | 3002 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 50,415 psi | 83% | 3238 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 46,557 psi | 76% | 3074 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 40,350 psi | 66% | 2940 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,778 psi | 83% | 3163 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,803 psi | 75% | 3064 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 43,555 psi | 72% | 3031 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,829 psi | 69% | 3045 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,387 psi | 84% | 3173 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,037 psi | 81% | 3146 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,502 psi | 83% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,627 psi | 70% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,860 psi | 74% | 2989 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,937 psi | 82% | 3228 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,473 psi | 83% | 3064 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,778 psi | 83% | 3159 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 41,727 psi | 69% | 2999 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 31,241 psi | 51% | 2825 fps | 97.3% |
| Somchem S385 | <<locked>> | 96% | 48,269 psi | 79% | 3159 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,763 psi | 83% | 3051 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,326 psi | 78% | 3054 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,514 psi | 78% | 3058 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,813 psi | 65% | 2923 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 35,621 psi | 58% | 2867 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 46,064 psi | 76% | 3048 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,753 psi | 62% | 2933 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 33,098 psi | 54% | 2881 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,172 psi | 58% | 2835 fps | 97.5% |
| Winchester 760 | <<locked>> | 86% | 44,092 psi | 72% | 3107 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,661 psi | 50% | 2877 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,834 psi | 80% | 3153 fps | 99.7% |
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 84 powders for .300 Blaser Mag. loaded with the .308 | 135gr | IBEX Viper. Alliant Reloder-26 delivers the highest muzzle velocity at 3,396 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,396 fps. Accurate 3100 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-19, 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. ReloadSwiss RS 70, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 Blaser Mag. with the .308 | 135gr | IBEX Viper 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.