Load Specifications
Load data in caliber .240 Weath. Mag. with .243 | 89gr | Merlin Virtus bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 84% | 56,695 psi | 89% | 3130 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,042 psi | 86% | 3146 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 3169 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 57,014 psi | 89% | 3189 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,679 psi | 86% | 3238 fps | 99.8% |
| Accurate High Country | <<locked>> | 98% | 53,925 psi | 85% | 3320 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 56,434 psi | 88% | 3225 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,375 psi | 85% | 3173 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 56,202 psi | 88% | 3287 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,290 psi | 90% | 3360 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,289 psi | 88% | 3281 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,013 psi | 86% | 3199 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,955 psi | 86% | 3215 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,477 psi | 87% | 3304 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,363 psi | 90% | 3337 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,477 psi | 87% | 3268 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,562 psi | 82% | 3261 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3196 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,946 psi | 67% | 3091 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3412 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,681 psi | 89% | 3241 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 55,637 psi | 87% | 3212 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,562 psi | 82% | 3261 fps | 96.9% |
| Bofors RP7 | <<locked>> | 90% | 55,085 psi | 86% | 3186 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 56,217 psi | 88% | 3228 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 57,348 psi | 90% | 3301 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,768 psi | 89% | 3251 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 57,116 psi | 90% | 3235 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,782 psi | 87% | 3219 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,551 psi | 90% | 3271 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,766 psi | 84% | 3264 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 2044 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,491 psi | 85% | 3176 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,653 psi | 90% | 3212 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,246 psi | 90% | 3212 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,478 psi | 89% | 3189 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 56,478 psi | 89% | 3225 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,232 psi | 90% | 3225 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 55,143 psi | 86% | 3228 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 56,405 psi | 88% | 3248 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,797 psi | 89% | 3192 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,216 psi | 87% | 3140 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,290 psi | 90% | 3202 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,840 psi | 89% | 3215 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 54,882 psi | 86% | 3202 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,207 psi | 68% | 2992 fps | 97% |
| Norma 201 | <<locked>> | 82% | 54,766 psi | 86% | 3159 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,825 psi | 87% | 3159 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,230 psi | 85% | 3199 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,566 psi | 90% | 3284 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 55,970 psi | 88% | 3356 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 57,203 psi | 90% | 3284 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,216 psi | 87% | 3225 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,260 psi | 88% | 3284 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 57% | 2090 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,144 psi | 88% | 3209 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,173 psi | 88% | 3294 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,449 psi | 88% | 3327 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,679 psi | 86% | 3261 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,508 psi | 90% | 3360 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,434 psi | 87% | 3159 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,840 psi | 88% | 3209 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,725 psi | 90% | 3251 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 54,592 psi | 86% | 3251 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,085 psi | 86% | 3186 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,840 psi | 89% | 3215 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,797 psi | 89% | 3192 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,290 psi | 90% | 3202 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,882 psi | 86% | 3202 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,983 psi | 85% | 3212 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,696 psi | 90% | 3225 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,940 psi | 86% | 3189 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,782 psi | 87% | 3091 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,869 psi | 89% | 3091 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,927 psi | 89% | 3166 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3307 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 55,361 psi | 87% | 3084 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,682 psi | 90% | 3212 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,535 psi | 87% | 3199 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,449 psi | 88% | 3284 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,027 psi | 86% | 3222 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 56,333 psi | 88% | 3071 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,869 psi | 88% | 3120 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,594 psi | 89% | 3136 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,246 psi | 90% | 3176 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,767 psi | 87% | 3222 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 3130 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 84% | 54,650 psi | 86% | 3127 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,694 psi | 86% | 3219 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3284 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,753 psi | 87% | 3186 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,348 psi | 90% | 3301 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,846 psi | 70% | 3245 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,955 psi | 86% | 3192 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3215 fps | 97.2% |
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% | 49,501 psi | 78% | 3022 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,124 psi | 75% | 3018 fps | 96.4% |
| Accurate 3100 | <<locked>> | 92% | 39,581 psi | 62% | 2910 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 46,891 psi | 73% | 3022 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,462 psi | 56% | 2838 fps | 96.2% |
| Accurate High Country | <<locked>> | 96% | 50,169 psi | 79% | 3245 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 52,779 psi | 83% | 3163 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,904 psi | 70% | 2995 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 49,124 psi | 77% | 3153 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,676 psi | 78% | 3225 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,965 psi | 77% | 3143 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,049 psi | 71% | 3018 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,254 psi | 76% | 3094 fps | 99.6% |
| Alliant Reloder-16 | 41.3 gr | 80% | 34,969 psi | 55% | 2858 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,813 psi | 62% | 3002 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,341 psi | 76% | 3133 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,861 psi | 72% | 3127 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,979 psi | 45% | 2690 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,623 psi | 59% | 2953 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 88% | 36,419 psi | 57% | 2966 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,721 psi | 83% | 3173 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 45,324 psi | 71% | 3025 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 45,861 psi | 72% | 3127 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 42,685 psi | 67% | 2940 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 45,701 psi | 72% | 3031 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 40,509 psi | 63% | 2963 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 46,630 psi | 73% | 3058 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 53,345 psi | 84% | 3173 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,343 psi | 51% | 2740 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,154 psi | 79% | 3150 fps | 100% |
| Hodgdon Superformance | 49.4 gr | 84% | 42,931 psi | 67% | 3045 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 42% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,227 psi | 80% | 3120 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,041 psi | 85% | 3156 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,210 psi | 74% | 3035 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,414 psi | 77% | 3061 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 43,656 psi | 68% | 2979 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,481 psi | 65% | 2913 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 34,200 psi | 54% | 2789 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 49,487 psi | 78% | 3127 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 52,968 psi | 83% | 3133 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,982 psi | 81% | 3087 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,311 psi | 74% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,841 psi | 61% | 2854 fps | 96% |
| Lovex S070 | <<locked>> | 82% | 39,537 psi | 62% | 2887 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 37,782 psi | 59% | 2867 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 51,474 psi | 81% | 3104 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,170 psi | 82% | 3104 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,601 psi | 75% | 3081 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 50,009 psi | 78% | 3143 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 41,959 psi | 66% | 3071 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,708 psi | 56% | 2844 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 48,138 psi | 75% | 3104 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 39,813 psi | 62% | 2953 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 43% | 1873 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,905 psi | 72% | 3015 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,315 psi | 82% | 3225 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,366 psi | 66% | 3071 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,563 psi | 56% | 2858 fps | 95.9% |
| ReloadSwiss RS 70 | 46.3 gr | 82% | 37,275 psi | 58% | 2933 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 48,950 psi | 77% | 3048 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,656 psi | 67% | 2966 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 54,201 psi | 85% | 3189 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 94% | 47,587 psi | 75% | 3120 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 42,685 psi | 67% | 2940 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,841 psi | 61% | 2854 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,968 psi | 83% | 3133 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,311 psi | 74% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,537 psi | 62% | 2887 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,932 psi | 69% | 3022 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,896 psi | 84% | 3159 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,401 psi | 81% | 3127 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,344 psi | 82% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,121 psi | 69% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,756 psi | 64% | 2854 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,152 psi | 74% | 3110 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,156 psi | 82% | 3031 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,621 psi | 84% | 3150 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,975 psi | 67% | 2966 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 32,039 psi | 50% | 2789 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 44,947 psi | 70% | 3031 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,924 psi | 83% | 3022 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,110 psi | 77% | 3015 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,705 psi | 78% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,162 psi | 65% | 2894 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 36,999 psi | 58% | 2844 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 96% | 44,382 psi | 70% | 3002 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 47,776 psi | 75% | 3012 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,434 psi | 57% | 2838 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 31,981 psi | 50% | 2776 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,332 psi | 57% | 2812 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 40,756 psi | 64% | 2969 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 29,327 psi | 46% | 2785 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,372 psi | 81% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,211 psi | 76% | 3084 fps | 95.5% |
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 95 powders for .240 Weath. Mag. loaded with the .243 | 89gr | Merlin Virtus. Alliant Reloder-26 delivers the highest muzzle velocity at 3,412 fps; across all powders the maximum-charge window runs from 2,044 fps to 3,412 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 89.0 gr projectile in 0.243" calls for a 1:8.5 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. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .240 Weath. Mag. with the .243 | 89gr | Merlin Virtus 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.