Load Specifications
Load data in caliber .300 WSM with .308 | 147gr | CamPro FMJ BT bullet and 22 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 57,479 psi | 90% | 2992 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,043 psi | 88% | 3018 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,231 psi | 88% | 3015 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,592 psi | 86% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,709 psi | 87% | 3005 fps | 96.3% |
| Accurate 4064 | <<locked>> | 92% | 56,101 psi | 88% | 3061 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3146 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,724 psi | 89% | 3110 fps | 99.5% |
| IMR 3031 | <<locked>> | 88% | 57,174 psi | 90% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 57,319 psi | 90% | 3077 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,276 psi | 90% | 3054 fps | 97.4% |
| IMR 4198 | <<locked>> | 82% | 56,971 psi | 89% | 2956 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3064 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,971 psi | 89% | 3074 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,910 psi | 83% | 3074 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 56,115 psi | 88% | 3117 fps | 99.9% |
| Norma 201 | <<locked>> | 88% | 55,434 psi | 87% | 3038 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,912 psi | 88% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,638 psi | 90% | 3130 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,563 psi | 86% | 3048 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,318 psi | 88% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,550 psi | 87% | 3140 fps | 97.3% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,877 psi | 75% | 2848 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,460 psi | 82% | 2966 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,451 psi | 63% | 2759 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,442 psi | 74% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,199 psi | 82% | 2949 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,203 psi | 60% | 2746 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 36,883 psi | 58% | 2776 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,236 psi | 68% | 2867 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 44,034 psi | 69% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,233 psi | 61% | 2740 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 47,601 psi | 75% | 2884 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 53,737 psi | 84% | 2910 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 48,631 psi | 76% | 2946 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,355 psi | 74% | 2907 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 38,043 psi | 60% | 2785 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 40,712 psi | 64% | 2828 fps | 97.8% |
| Norma 201 | <<locked>> | 80% | 43,076 psi | 68% | 2822 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 43,366 psi | 68% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,131 psi | 61% | 2782 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,010 psi | 50% | 2582 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 45,774 psi | 72% | 2923 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 48,457 psi | 76% | 3012 fps | 95.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 22 powders for .300 WSM loaded with the .308 | 147gr | CamPro FMJ BT. Accurate 4350 delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 2,956 fps to 3,146 fps. Accurate 4350 gives the best case fill at 100 %, and 22 of the 22 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 83–90 %, leaving at least 10 % headroom. The 147.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, IMR 4350, IMR 4831 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.