Load Specifications
Bullet:.308 | 150gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:150 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 Lapua Mag. load data
Case Length (l3):2.724"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:100 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:60,916 psi
Recommended Twist Rate:1:11.5
Load data in caliber .300 Lapua Mag. with .308 | 150gr | Barnes MRX BT bullet and 86 powders. The key underlying parameters are shown in the table above.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,940 psi | 90% | 3077 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,214 psi | 87% | 3097 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,071 psi | 90% | 3202 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 52,069 psi | 85% | 3084 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,142 psi | 87% | 3199 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 52,794 psi | 87% | 3294 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 52,591 psi | 86% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,650 psi | 90% | 3248 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 98% | 52,272 psi | 86% | 3232 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,708 psi | 90% | 3241 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,432 psi | 88% | 3150 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,417 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,360 psi | 89% | 3268 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 51,750 psi | 85% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,969 psi | 89% | 3232 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,998 psi | 90% | 3294 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,982 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,092 psi | 74% | 3136 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,880 psi | 85% | 3304 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,328 psi | 83% | 3209 fps | 97.4% |
| Bofors RP3 | <<locked>> | 84% | 54,041 psi | 89% | 3163 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,998 psi | 90% | 3294 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 53,737 psi | 88% | 3146 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 54,563 psi | 90% | 3182 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 52,083 psi | 86% | 3196 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 86% | 51,750 psi | 85% | 3150 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,955 psi | 90% | 3222 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,549 psi | 90% | 3179 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,077 psi | 72% | 3166 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 88% | 52,243 psi | 86% | 3228 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 60% | 2021 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,054 psi | 85% | 3104 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,520 psi | 90% | 3140 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 54,868 psi | 90% | 3182 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,083 psi | 86% | 3123 fps | 98.7% |
| IMR 4831 | <<locked>> | 92% | 53,853 psi | 88% | 3192 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,853 psi | 90% | 3199 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,114 psi | 89% | 3169 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,432 psi | 88% | 3268 fps | 96.8% |
| Lovex S062 | <<locked>> | 82% | 52,069 psi | 85% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 51,996 psi | 85% | 3117 fps | 99.5% |
| Lovex S070 | <<locked>> | 90% | 53,301 psi | 88% | 3159 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,455 psi | 75% | 3031 fps | 98.5% |
| Norma 203B | <<locked>> | 82% | 52,750 psi | 87% | 3153 fps | 100% |
| Norma 204 | <<locked>> | 90% | 51,953 psi | 85% | 3173 fps | 97.4% |
| Norma MRP | <<locked>> | 98% | 54,679 psi | 90% | 3323 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 52,170 psi | 86% | 3182 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 53,722 psi | 88% | 3182 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,998 psi | 89% | 3287 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 54,752 psi | 90% | 3245 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,022 psi | 79% | 3143 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 61% | 2070 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,491 psi | 89% | 3163 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,085 psi | 90% | 3281 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,359 psi | 88% | 3222 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 51,909 psi | 85% | 3248 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,193 psi | 73% | 3159 fps | 97.7% |
| Rottweil R 902 | <<locked>> | 82% | 53,911 psi | 89% | 3110 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,114 psi | 89% | 3159 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,707 psi | 87% | 3153 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 96% | 53,142 psi | 87% | 3215 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 53,737 psi | 88% | 3146 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 51,996 psi | 85% | 3117 fps | 99.5% |
| Shooters World Precision | <<locked>> | 82% | 52,069 psi | 85% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,301 psi | 88% | 3159 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,504 psi | 86% | 3169 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 51,996 psi | 85% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,114 psi | 90% | 3120 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,678 psi | 86% | 3209 fps | 97.9% |
| Somchem S355 | <<locked>> | 86% | 54,085 psi | 89% | 3156 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,389 psi | 89% | 3143 fps | 96.2% |
| Somchem S365 | <<locked>> | 92% | 51,561 psi | 85% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,766 psi | 88% | 3189 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,505 psi | 89% | 3071 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,795 psi | 90% | 3084 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,011 psi | 85% | 3074 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,215 psi | 89% | 3179 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,171 psi | 87% | 3159 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 82% | 53,113 psi | 87% | 3077 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,432 psi | 88% | 3182 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 54,259 psi | 89% | 3248 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,911 psi | 90% | 3310 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,983 psi | 89% | 3140 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,286 psi | 86% | 3199 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,369 psi | 78% | 3284 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,983 psi | 89% | 3182 fps | 97.9% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,547 psi | 85% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,690 psi | 82% | 3035 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 33,533 psi | 55% | 2756 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,878 psi | 80% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,217 psi | 61% | 2874 fps | 98% |
| Accurate High Country | <<locked>> | 92% | 45,585 psi | 75% | 3146 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 46,325 psi | 76% | 3009 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,599 psi | 73% | 3051 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 48,820 psi | 80% | 3163 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,715 psi | 73% | 3051 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,818 psi | 77% | 3035 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,038 psi | 82% | 3110 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,535 psi | 60% | 2894 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,655 psi | 68% | 3035 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,193 psi | 73% | 3041 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,756 psi | 69% | 3031 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,527 psi | 44% | 2605 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,519 psi | 57% | 2867 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 84% | 32,909 psi | 54% | 2867 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 43,903 psi | 72% | 3074 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,181 psi | 77% | 3045 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,756 psi | 69% | 3031 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,452 psi | 68% | 2904 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 47,587 psi | 78% | 3058 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 39,479 psi | 65% | 2933 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,467 psi | 70% | 2959 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,285 psi | 84% | 3153 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,895 psi | 56% | 2772 fps | 98.6% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,234 psi | 68% | 3094 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 38,508 psi | 63% | 2936 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 44% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,733 psi | 80% | 3045 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,140 psi | 84% | 3081 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 39,755 psi | 65% | 2881 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,931 psi | 70% | 2936 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 35,897 psi | 59% | 2825 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 51,358 psi | 84% | 3140 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,749 psi | 83% | 3107 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 49,864 psi | 82% | 3199 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 48,950 psi | 80% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,364 psi | 66% | 2881 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 38,522 psi | 63% | 2854 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 34,809 psi | 57% | 2789 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 49,385 psi | 81% | 3094 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,194 psi | 74% | 3041 fps | 95.8% |
| Norma MRP | <<locked>> | 88% | 38,189 psi | 63% | 2976 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 37,231 psi | 61% | 2874 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 50,111 psi | 82% | 3120 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,557 psi | 76% | 3140 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 36,216 psi | 59% | 2858 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 41,263 psi | 68% | 2999 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 45% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,747 psi | 78% | 3041 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,353 psi | 73% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,231 psi | 61% | 2894 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,245 psi | 60% | 2904 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,130 psi | 63% | 3002 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 50,662 psi | 83% | 3054 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,295 psi | 73% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,327 psi | 81% | 3091 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 43,192 psi | 71% | 3018 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,452 psi | 68% | 2904 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,364 psi | 66% | 2881 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 48,950 psi | 80% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,522 psi | 63% | 2854 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,818 psi | 75% | 3045 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,629 psi | 75% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,479 psi | 65% | 2818 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,801 psi | 70% | 3012 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 44,730 psi | 73% | 2989 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,821 psi | 83% | 3077 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,678 psi | 55% | 2822 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 40,944 psi | 67% | 2936 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 50,937 psi | 84% | 3018 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,343 psi | 84% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,685 psi | 70% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,595 psi | 63% | 2874 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,437 psi | 66% | 2910 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 49,603 psi | 81% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,072 psi | 63% | 2874 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,153 psi | 48% | 2690 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 51,285 psi | 84% | 3241 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,927 psi | 62% | 2841 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,595 psi | 65% | 2936 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,760 psi | 44% | 2703 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,526 psi | 71% | 2986 fps | 95.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 86 powders for .300 Lapua Mag. loaded with the .308 | 150gr | Barnes MRX BT. Norma MRP delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,323 fps. Accurate 3100 gives the best case fill at 100 %, and 86 of the 86 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.