Load Specifications
Load data in caliber .240 Weath. Mag. with .243 | 100gr | Speer Grand Slam bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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 2700 | <<locked>> | 82% | 57,232 psi | 90% | 3035 fps | 99.1% |
| Accurate 3100 | <<locked>> | 98% | 57,101 psi | 89% | 3094 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 57,014 psi | 89% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,824 psi | 86% | 3081 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,404 psi | 85% | 3176 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 96% | 55,593 psi | 87% | 3179 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 56,463 psi | 88% | 3048 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,796 psi | 87% | 3130 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,971 psi | 89% | 3182 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,450 psi | 62% | 2874 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,796 psi | 87% | 3123 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,711 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,492 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,000 psi | 89% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,071 psi | 86% | 3114 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,536 psi | 89% | 3179 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,864 psi | 78% | 3094 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,027 psi | 85% | 3189 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3163 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 55,347 psi | 87% | 3041 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,536 psi | 89% | 3179 fps | 98.7% |
| Bofors RP7 | <<locked>> | 86% | 54,462 psi | 85% | 3025 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 3031 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 82% | 55,201 psi | 87% | 3054 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,623 psi | 89% | 3133 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 55,898 psi | 88% | 3087 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 57,246 psi | 90% | 3123 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,188 psi | 88% | 3107 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,796 psi | 87% | 3058 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,573 psi | 76% | 3133 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 88% | 57,188 psi | 90% | 3169 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1946 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,028 psi | 88% | 3031 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,637 psi | 87% | 3064 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,956 psi | 88% | 3054 fps | 99.4% |
| IMR 4831 | <<locked>> | 90% | 55,332 psi | 87% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,984 psi | 86% | 3051 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 98% | 54,665 psi | 86% | 3156 fps | 97.3% |
| Lovex S062 | <<locked>> | 82% | 56,420 psi | 88% | 3025 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,376 psi | 88% | 3054 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 57,653 psi | 90% | 3094 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,575 psi | 79% | 2989 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 57,203 psi | 90% | 3084 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,782 psi | 89% | 3120 fps | 98.4% |
| Norma MRP | <<locked>> | 96% | 56,362 psi | 88% | 3202 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 56,840 psi | 89% | 3117 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,317 psi | 87% | 3176 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 90% | 55,999 psi | 88% | 3123 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,374 psi | 84% | 3104 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,926 psi | 86% | 3035 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,434 psi | 88% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,897 psi | 86% | 3104 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,855 psi | 89% | 3189 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,994 psi | 77% | 3130 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 84% | 55,492 psi | 87% | 3038 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,087 psi | 89% | 3094 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 94% | 54,375 psi | 85% | 3097 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 86% | 54,462 psi | 85% | 3025 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,376 psi | 88% | 3054 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,420 psi | 88% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,653 psi | 90% | 3094 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,811 psi | 89% | 3097 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,695 psi | 87% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,753 psi | 87% | 2999 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,725 psi | 90% | 3156 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 55,245 psi | 87% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,347 psi | 87% | 3028 fps | 96.7% |
| Somchem S365 | <<locked>> | 92% | 57,043 psi | 89% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,230 psi | 87% | 3077 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 86% | 56,376 psi | 88% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,303 psi | 87% | 3058 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,650 psi | 86% | 3051 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 56,971 psi | 89% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,389 psi | 85% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,304 psi | 88% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,347 psi | 88% | 3196 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3097 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,940 psi | 86% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,985 psi | 89% | 3140 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,274 psi | 87% | 3071 fps | 98.4% |
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 2700 | <<locked>> | 80% | 53,650 psi | 84% | 2976 fps | 98.7% |
| Accurate 3100 | <<locked>> | 84% | 35,447 psi | 56% | 2674 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 53,693 psi | 84% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,597 psi | 65% | 2835 fps | 99% |
| Accurate High Country | 50.5 gr | 90% | 47,369 psi | 74% | 3045 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 94% | 51,605 psi | 81% | 3107 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,850 psi | 78% | 2936 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,757 psi | 67% | 2877 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 92% | 46,630 psi | 73% | 2986 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 98% | 37,144 psi | 58% | 2812 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,917 psi | 67% | 2874 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,879 psi | 80% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,089 psi | 63% | 2844 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,934 psi | 72% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,467 psi | 67% | 2867 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 43,221 psi | 68% | 2923 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,675 psi | 47% | 2582 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,547 psi | 53% | 2713 fps | 95.8% |
| Alliant Reloder-26 | 46.2 gr | 80% | 31,937 psi | 50% | 2700 fps | 95.9% |
| Bofors RP15 | <<locked>> | 92% | 42,627 psi | 67% | 2910 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,735 psi | 81% | 2982 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 43,221 psi | 68% | 2923 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,947 psi | 70% | 2848 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 98% | 45,905 psi | 72% | 2963 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,663 psi | 81% | 2992 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,352 psi | 68% | 2884 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 46,209 psi | 72% | 2907 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 92% | 49,864 psi | 78% | 2995 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,950 psi | 77% | 2979 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,637 psi | 59% | 2726 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,958 psi | 63% | 2927 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 42,583 psi | 67% | 2900 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 43% | 1742 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,460 psi | 82% | 2976 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,596 psi | 64% | 2769 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,354 psi | 73% | 2881 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 39,726 psi | 62% | 2782 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,341 psi | 76% | 2930 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 94% | 47,587 psi | 75% | 3022 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,866 psi | 83% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,005 psi | 69% | 2828 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 42,119 psi | 66% | 2805 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 34,330 psi | 54% | 2644 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 53,592 psi | 84% | 3025 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,062 psi | 67% | 2861 fps | 95.4% |
| Norma MRP | 47.1 gr | 84% | 36,883 psi | 58% | 2805 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,959 psi | 64% | 2822 fps | 98.9% |
| Ramshot Grand | <<locked>> | 92% | 44,599 psi | 70% | 2969 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,914 psi | 63% | 2812 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 39,755 psi | 62% | 2835 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 44% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,488 psi | 81% | 2976 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,718 psi | 76% | 3031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,568 psi | 65% | 2858 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,914 psi | 63% | 2864 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,811 psi | 58% | 2835 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 48,501 psi | 76% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 47,050 psi | 74% | 2913 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 86% | 41,771 psi | 65% | 2851 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,947 psi | 70% | 2848 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,005 psi | 69% | 2828 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 52,866 psi | 83% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,119 psi | 66% | 2805 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,835 psi | 78% | 2982 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,327 psi | 77% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,004 psi | 67% | 2766 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,408 psi | 65% | 2848 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,747 psi | 76% | 2923 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,385 psi | 76% | 2907 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,811 psi | 59% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,581 psi | 62% | 2772 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 46,427 psi | 73% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,453 psi | 67% | 2825 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 39,146 psi | 61% | 2753 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 53,447 psi | 84% | 2946 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,858 psi | 66% | 2822 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,170 psi | 52% | 2667 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 92% | 49,168 psi | 77% | 3061 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 98% | 48,675 psi | 76% | 3035 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,626 psi | 65% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,613 psi | 68% | 2890 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,252 psi | 41% | 2556 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,756 psi | 65% | 2815 fps | 95.2% |
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 83 powders for .240 Weath. Mag. loaded with the .243 | 100gr | Speer Grand Slam. Winchester StaBALL HD delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,238 fps. ADI AR 2225 gives the best case fill at 100 %, and 83 of the 83 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 100.0 gr projectile in 0.243" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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, Accurate High Country, Norma MRP rank at the top here: for .240 Weath. Mag. with the .243 | 100gr | Speer Grand Slam 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.