Load Specifications
Load data in caliber .240 Weath. Mag. with .243 | 88gr | Warner Tool Co. Flat Line bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Alliant Reloder-26.
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% | 56,869 psi | 89% | 3140 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,534 psi | 85% | 3140 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3169 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 57,116 psi | 90% | 3196 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,346 psi | 85% | 3241 fps | 99.8% |
| Accurate High Countryᴾ | <<locked>> | 100% | 57,217 psi | 90% | 3386 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 56,115 psi | 88% | 3225 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,450 psi | 90% | 3228 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,419 psi | 87% | 3278 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,797 psi | 89% | 3363 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,477 psi | 87% | 3271 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,404 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,694 psi | 86% | 3219 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,824 psi | 86% | 3301 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,318 psi | 88% | 3333 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,752 psi | 86% | 3261 fps | 96.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3255 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,907 psi | 77% | 3196 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,583 psi | 67% | 3087 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 3406 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,072 psi | 88% | 3235 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 55,201 psi | 87% | 3212 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3255 fps | 96.5% |
| Bofors RP7 | <<locked>> | 90% | 54,969 psi | 86% | 3189 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 86% | 55,767 psi | 87% | 3225 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 56,507 psi | 89% | 3294 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 56,173 psi | 88% | 3248 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 56,724 psi | 89% | 3235 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,158 psi | 86% | 3222 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,188 psi | 90% | 3274 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,319 psi | 90% | 3337 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 2044 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,041 psi | 85% | 3176 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,101 psi | 89% | 3212 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,565 psi | 89% | 3209 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,825 psi | 87% | 3182 fps | 98.4% |
| IMR 4350 | <<locked>> | 94% | 55,637 psi | 87% | 3215 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,608 psi | 89% | 3222 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 54,723 psi | 86% | 3232 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 56,086 psi | 88% | 3251 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 56,608 psi | 89% | 3196 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,795 psi | 86% | 3140 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,710 psi | 89% | 3202 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,420 psi | 88% | 3212 fps | 99.3% |
| Lovex S070 | <<locked>> | 92% | 54,549 psi | 85% | 3202 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,149 psi | 68% | 2995 fps | 96.7% |
| Norma 201 | <<locked>> | 82% | 54,897 psi | 86% | 3166 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,463 psi | 87% | 3163 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,983 psi | 85% | 3202 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,710 psi | 89% | 3274 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3353 fps | 98.5% |
| Norma URP | <<locked>> | 94% | 56,652 psi | 89% | 3281 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 54,984 psi | 86% | 3228 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,463 psi | 87% | 3278 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 57% | 2090 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,985 psi | 88% | 3209 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,753 psi | 87% | 3294 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,753 psi | 87% | 3327 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,302 psi | 85% | 3264 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,681 psi | 89% | 3353 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 55,579 psi | 87% | 3166 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,419 psi | 87% | 3209 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,276 psi | 90% | 3248 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3307 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 54,969 psi | 86% | 3189 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,420 psi | 88% | 3212 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,608 psi | 89% | 3196 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,710 psi | 89% | 3202 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,549 psi | 85% | 3202 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,145 psi | 90% | 3274 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,566 psi | 90% | 3225 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,621 psi | 86% | 3189 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,695 psi | 87% | 3097 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,463 psi | 88% | 3091 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,608 psi | 89% | 3163 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3301 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 55,448 psi | 87% | 3091 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,029 psi | 89% | 3209 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,361 psi | 87% | 3202 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,869 psi | 88% | 3287 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,462 psi | 85% | 3215 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 82% | 56,130 psi | 88% | 3077 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,477 psi | 87% | 3123 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,898 psi | 88% | 3136 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,724 psi | 89% | 3176 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,274 psi | 87% | 3219 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,270 psi | 79% | 3123 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 84% | 54,404 psi | 85% | 3133 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,317 psi | 85% | 3222 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3281 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,027 psi | 86% | 3182 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,840 psi | 89% | 3297 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,193 psi | 69% | 3238 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,708 psi | 86% | 3196 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 3212 fps | 96.8% |
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% | 49,661 psi | 78% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,674 psi | 75% | 3012 fps | 96% |
| Accurate 3100 | <<locked>> | 92% | 39,566 psi | 62% | 2917 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,021 psi | 74% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,534 psi | 56% | 2844 fps | 96% |
| Accurate High Country | <<locked>> | 98% | 53,229 psi | 83% | 3317 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,460 psi | 82% | 3159 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 44,585 psi | 70% | 2992 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 94% | 48,414 psi | 76% | 3140 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,950 psi | 77% | 3219 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,588 psi | 76% | 3143 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,121 psi | 71% | 3025 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,964 psi | 75% | 3094 fps | 99.5% |
| Alliant Reloder-16 | 40.5 gr | 80% | 35,056 psi | 55% | 2864 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,639 psi | 62% | 3005 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,964 psi | 75% | 3133 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 48,370 psi | 76% | 3186 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,109 psi | 46% | 2697 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,579 psi | 59% | 2956 fps | 95.5% |
| Alliant Reloder-26 | 49.1 gr | 88% | 36,129 psi | 57% | 2963 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,431 psi | 82% | 3176 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 45,281 psi | 71% | 3031 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 48,370 psi | 76% | 3186 fps | 95.5% |
| Bofors RP7 | <<locked>> | 84% | 45,368 psi | 71% | 3002 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 45,571 psi | 71% | 3035 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 43,323 psi | 68% | 3035 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 46,383 psi | 73% | 3058 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,011 psi | 83% | 3173 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,474 psi | 51% | 2746 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,821 psi | 78% | 3150 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,670 psi | 67% | 3045 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,992 psi | 42% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,778 psi | 80% | 3117 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,490 psi | 84% | 3156 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,847 psi | 73% | 3031 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,153 psi | 77% | 3058 fps | 97.2% |
| IMR 4350 | <<locked>> | 86% | 43,279 psi | 68% | 2972 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 44,150 psi | 69% | 2979 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 34,447 psi | 54% | 2799 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 49,211 psi | 77% | 3127 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 52,837 psi | 83% | 3136 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,561 psi | 81% | 3084 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 47,108 psi | 74% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,798 psi | 61% | 2858 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 42,105 psi | 66% | 2949 fps | 95.6% |
| Lovex S071 | <<locked>> | 96% | 37,797 psi | 59% | 2874 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,285 psi | 80% | 3104 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,112 psi | 82% | 3110 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,369 psi | 74% | 3081 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 49,559 psi | 78% | 3143 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 44,570 psi | 70% | 3140 fps | 96% |
| Norma URP | <<locked>> | 80% | 35,578 psi | 56% | 2844 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 47,616 psi | 75% | 3100 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 39,494 psi | 62% | 2953 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,499 psi | 43% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,759 psi | 72% | 3015 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,880 psi | 81% | 3228 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,134 psi | 66% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,346 psi | 55% | 2861 fps | 95.6% |
| ReloadSwiss RS 70 | 45.4 gr | 82% | 37,260 psi | 58% | 2936 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 48,776 psi | 76% | 3051 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,583 psi | 67% | 2969 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 53,461 psi | 84% | 3182 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 46,905 psi | 74% | 3110 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 45,368 psi | 71% | 3002 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,798 psi | 61% | 2858 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,837 psi | 83% | 3136 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,108 psi | 74% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 42,105 psi | 66% | 2949 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,700 psi | 68% | 3025 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,780 psi | 84% | 3163 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,082 psi | 80% | 3130 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,257 psi | 82% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,092 psi | 69% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,814 psi | 64% | 2858 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 49,951 psi | 78% | 3173 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 51,880 psi | 81% | 3038 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,330 psi | 84% | 3150 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,873 psi | 67% | 2969 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 32,010 psi | 50% | 2792 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 44,730 psi | 70% | 3031 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 52,779 psi | 83% | 3028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,081 psi | 77% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,385 psi | 77% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,031 psi | 64% | 2897 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 36,854 psi | 58% | 2848 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 47,094 psi | 74% | 3064 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,587 psi | 75% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,419 psi | 57% | 2844 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 32,053 psi | 50% | 2785 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,347 psi | 57% | 2818 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 43,323 psi | 68% | 3035 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 29,443 psi | 46% | 2795 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,097 psi | 80% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,630 psi | 75% | 3081 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 95 powders for .240 Weath. Mag. loaded with the .243 | 88gr | Warner Tool Co. Flat Line. Alliant Reloder-26 delivers the highest muzzle velocity at 3,406 fps; across all powders the maximum-charge window runs from 2,044 fps to 3,406 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 88.0 gr projectile in 0.243" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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-16, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .240 Weath. Mag. with the .243 | 88gr | Warner Tool Co. Flat Line 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.