Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Norma GTX bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 56,695 psi | 89% | 2992 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,215 psi | 85% | 3002 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3107 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 57,334 psi | 90% | 3051 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,723 psi | 86% | 3104 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,927 psi | 89% | 3081 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,492 psi | 87% | 3143 fps | 97.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3202 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,782 psi | 89% | 3212 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,404 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,607 psi | 86% | 3071 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,230 psi | 87% | 3163 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,753 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,056 psi | 86% | 3133 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 3196 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,098 psi | 83% | 3123 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,195 psi | 72% | 3041 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,537 psi | 90% | 3274 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3110 fps | 97% |
| Bofors RP3 | <<locked>> | 84% | 55,317 psi | 87% | 3068 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 3196 fps | 98.1% |
| Bofors RP7 | <<locked>> | 88% | 54,810 psi | 86% | 3051 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 55,666 psi | 87% | 3087 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 56,695 psi | 89% | 3156 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 56,231 psi | 88% | 3114 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 98% | 57,290 psi | 90% | 3143 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,956 psi | 88% | 3120 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,840 psi | 88% | 3087 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,116 psi | 90% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 57,246 psi | 90% | 3196 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 57% | 1955 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,450 psi | 90% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,420 psi | 88% | 3064 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,550 psi | 87% | 3045 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 55,753 psi | 87% | 3084 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,202 psi | 88% | 3077 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 54,969 psi | 86% | 3094 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,999 psi | 88% | 3104 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,882 psi | 86% | 3068 fps | 95.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3169 fps | 96.4% |
| Lovex S062 | <<locked>> | 84% | 56,782 psi | 89% | 3058 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,420 psi | 88% | 3077 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 54,549 psi | 85% | 3064 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2943 fps | 98.3% |
| Norma 203B | <<locked>> | 84% | 57,551 psi | 90% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,681 psi | 89% | 3140 fps | 97.8% |
| Norma MRP | <<locked>> | 98% | 55,912 psi | 88% | 3222 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 56,869 psi | 89% | 3143 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,810 psi | 86% | 3087 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,969 psi | 86% | 3186 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 92% | 55,680 psi | 87% | 3140 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,182 psi | 77% | 3048 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1998 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,579 psi | 87% | 3068 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,260 psi | 88% | 3182 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,636 psi | 86% | 3127 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,753 psi | 89% | 3215 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,194 psi | 71% | 3058 fps | 97.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,303 psi | 87% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,593 psi | 87% | 3068 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,130 psi | 90% | 3114 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 54,317 psi | 85% | 3120 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 88% | 54,810 psi | 86% | 3051 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,420 psi | 88% | 3077 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 56,782 psi | 89% | 3058 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,549 psi | 85% | 3064 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,174 psi | 90% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,318 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,130 psi | 88% | 3025 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,464 psi | 90% | 3173 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 55,405 psi | 87% | 3061 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,550 psi | 89% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,839 psi | 86% | 3091 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 82% | 55,564 psi | 87% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,883 psi | 88% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,710 psi | 89% | 3035 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,419 psi | 87% | 3084 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3064 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 57,624 psi | 90% | 3038 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,520 psi | 85% | 3087 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 55,521 psi | 87% | 3150 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,072 psi | 88% | 3209 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,100 psi | 86% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,913 psi | 89% | 3163 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,544 psi | 76% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,085 psi | 86% | 3087 fps | 97.7% |
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 2495 | <<locked>> | 80% | 53,200 psi | 83% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,633 psi | 79% | 2940 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 37,420 psi | 59% | 2740 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 50,430 psi | 79% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,595 psi | 60% | 2792 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,384 psi | 74% | 2913 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 45,643 psi | 72% | 2956 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 49,748 psi | 78% | 3064 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,794 psi | 83% | 3146 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,066 psi | 75% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,126 psi | 80% | 3012 fps | 99.9% |
| Alliant Reloder-16 | 64.9 gr | 80% | 37,463 psi | 59% | 2802 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,670 psi | 67% | 2940 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,295 psi | 71% | 2946 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,919 psi | 72% | 3002 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,572 psi | 43% | 2530 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,563 psi | 56% | 2782 fps | 95.7% |
| Alliant Reloder-26 | 75.2 gr | 84% | 34,069 psi | 53% | 2782 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 45,078 psi | 71% | 2982 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,530 psi | 76% | 2956 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,919 psi | 72% | 3002 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 42,453 psi | 67% | 2812 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 48,776 psi | 76% | 2963 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 40,596 psi | 64% | 2841 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 43,453 psi | 68% | 2867 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 53,476 psi | 84% | 3077 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,214 psi | 82% | 3054 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,085 psi | 55% | 2690 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,214 psi | 83% | 3064 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,525 psi | 67% | 2917 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 43% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,809 psi | 84% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,792 psi | 78% | 2953 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,054 psi | 82% | 2982 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 40,582 psi | 64% | 2789 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,976 psi | 69% | 2848 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 37,101 psi | 58% | 2740 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 52,475 psi | 82% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,677 psi | 81% | 3009 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 50,865 psi | 80% | 3100 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,038 psi | 78% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,466 psi | 65% | 2792 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 39,653 psi | 62% | 2769 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 36,245 psi | 57% | 2713 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 50,502 psi | 79% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,282 psi | 73% | 2946 fps | 95.4% |
| Norma MRP | 76.5 gr | 88% | 39,276 psi | 62% | 2884 fps | 95% |
| Norma URP | <<locked>> | 80% | 38,319 psi | 60% | 2785 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,126 psi | 80% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,155 psi | 80% | 3117 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,173 psi | 58% | 2769 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 42,409 psi | 66% | 2907 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 44% | 1788 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,675 psi | 76% | 2946 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,310 psi | 71% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,406 psi | 60% | 2808 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,260 psi | 58% | 2812 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,221 psi | 66% | 2986 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,967 psi | 81% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,556 psi | 71% | 2894 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 50,415 psi | 79% | 2995 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 44,382 psi | 70% | 2927 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,453 psi | 67% | 2812 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,466 psi | 65% | 2792 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 50,038 psi | 78% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,653 psi | 62% | 2769 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,746 psi | 73% | 2949 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,644 psi | 73% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,582 psi | 64% | 2730 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,976 psi | 69% | 2923 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 45,832 psi | 72% | 2894 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,853 psi | 55% | 2740 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 42,192 psi | 66% | 2848 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 52,156 psi | 82% | 2927 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,344 psi | 82% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,772 psi | 69% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,682 psi | 62% | 2785 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 44,396 psi | 70% | 2884 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,720 psi | 79% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,247 psi | 62% | 2789 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,429 psi | 48% | 2615 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 96% | 52,388 psi | 82% | 3140 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,870 psi | 61% | 2756 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 40,741 psi | 64% | 2844 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,905 psi | 44% | 2628 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,614 psi | 70% | 2894 fps | 95.1% |
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 86 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Norma GTX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,274 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 (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Norma GTX 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.