Load Specifications
Load data in caliber .243 WSSM with .243 | 80gr | Berger Varmint 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 Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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 2015 | <<locked>> | 84% | 55,811 psi | 87% | 3199 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,853 psi | 86% | 3219 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,782 psi | 89% | 3294 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,969 psi | 85% | 3199 fps | 95.8% |
| Accurate 4064 | <<locked>> | 90% | 55,216 psi | 87% | 3274 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,100 psi | 86% | 3350 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 86% | 55,274 psi | 87% | 3304 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 56,159 psi | 88% | 3297 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,696 psi | 90% | 3310 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,100 psi | 86% | 3235 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,013 psi | 86% | 3428 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,985 psi | 88% | 3320 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,434 psi | 88% | 3327 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,145 psi | 90% | 3353 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3419 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,940 psi | 85% | 3396 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,509 psi | 63% | 3100 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,556 psi | 71% | 3281 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,361 psi | 87% | 3314 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 57,450 psi | 90% | 3346 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,435 psi | 90% | 3307 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,970 psi | 88% | 3238 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,363 psi | 90% | 3337 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,666 psi | 87% | 3389 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 90% | 54,607 psi | 86% | 3294 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 96% | 54,476 psi | 85% | 3343 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 55,825 psi | 87% | 3317 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,359 psi | 82% | 3271 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,579 psi | 87% | 3350 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,288 psi | 87% | 3379 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 55% | 2073 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,072 psi | 89% | 3317 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 55,622 psi | 87% | 3301 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,680 psi | 87% | 3281 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,593 psi | 87% | 3251 fps | 96.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3327 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,535 psi | 87% | 3278 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3343 fps | 99.3% |
| IMR 4895 | <<locked>> | 88% | 54,766 psi | 86% | 3323 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 57,696 psi | 90% | 3310 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,071 psi | 86% | 3278 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,636 psi | 86% | 3225 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 55,593 psi | 87% | 3281 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,042 psi | 86% | 3271 fps | 98.1% |
| Lovex S070 | <<locked>> | 98% | 55,985 psi | 88% | 3307 fps | 97.3% |
| Norma 201 | <<locked>> | 88% | 57,290 psi | 90% | 3301 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,404 psi | 85% | 3248 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,318 psi | 88% | 3337 fps | 99.8% |
| Norma URP | <<locked>> | 98% | 54,027 psi | 85% | 3333 fps | 99% |
| Ramshot Big Game | <<locked>> | 90% | 57,000 psi | 89% | 3360 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,753 psi | 89% | 3389 fps | 98.1% |
| Ramshot TAC | <<locked>> | 84% | 54,404 psi | 85% | 3258 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,346 psi | 85% | 3284 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,998 psi | 86% | 3245 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 56% | 2123 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,130 psi | 90% | 3287 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,955 psi | 86% | 3271 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,838 psi | 84% | 3360 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,508 psi | 90% | 3461 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,911 psi | 86% | 3369 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,447 psi | 85% | 3396 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,868 psi | 86% | 3235 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,679 psi | 86% | 3248 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,290 psi | 90% | 3337 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,435 psi | 90% | 3307 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,042 psi | 86% | 3271 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,071 psi | 86% | 3278 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,593 psi | 87% | 3281 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,985 psi | 88% | 3307 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,274 psi | 87% | 3337 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,637 psi | 89% | 3297 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,392 psi | 90% | 3330 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,332 psi | 87% | 3186 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,927 psi | 88% | 3179 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,492 psi | 87% | 3219 fps | 97% |
| Somchem S321 | <<locked>> | 82% | 55,695 psi | 87% | 3287 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,766 psi | 86% | 3179 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,420 psi | 88% | 3291 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 57,363 psi | 90% | 3330 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 3340 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,853 psi | 86% | 3146 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,550 psi | 87% | 3169 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,273 psi | 85% | 3212 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,172 psi | 86% | 3225 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,448 psi | 87% | 3251 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,608 psi | 89% | 3333 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 84% | 54,679 psi | 86% | 3251 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,956 psi | 89% | 3271 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,724 psi | 87% | 3333 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 3192 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,203 psi | 90% | 3307 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,708 psi | 86% | 3301 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,476 psi | 85% | 3343 fps | 96.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,303 psi | 57% | 3084 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,479 psi | 90% | 3340 fps | 100% |
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 2015 | <<locked>> | 80% | 49,255 psi | 77% | 3094 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,322 psi | 66% | 3005 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,385 psi | 77% | 3173 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,749 psi | 80% | 3140 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,001 psi | 63% | 2989 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 38,711 psi | 61% | 3015 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,687 psi | 72% | 3120 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,783 psi | 61% | 2943 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,718 psi | 75% | 3133 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 48,283 psi | 76% | 3130 fps | 100% |
| Alliant Power Pro 2000-MR | 40 gr | 80% | 41,553 psi | 65% | 3140 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,238 psi | 72% | 3136 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,551 psi | 60% | 2969 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,336 psi | 65% | 3038 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 38,566 psi | 60% | 3035 fps | 95.6% |
| Alliant Reloder-17 | 39.4 gr | 80% | 33,272 psi | 52% | 2910 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 33,402 psi | 52% | 2907 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,465 psi | 62% | 3130 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,904 psi | 70% | 3114 fps | 97.5% |
| Bofors RP3 | <<locked>> | 80% | 38,261 psi | 60% | 2969 fps | 97.8% |
| Bofors RP7 | <<locked>> | 92% | 50,415 psi | 79% | 3179 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,284 psi | 77% | 3123 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,702 psi | 73% | 3150 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,866 psi | 81% | 3320 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 39,030 psi | 61% | 2969 fps | 95% |
| Hodgdon H414 | <<locked>> | 92% | 47,340 psi | 74% | 3205 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,093 psi | 72% | 3133 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 33,257 psi | 52% | 2851 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,293 psi | 66% | 3097 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 94% | 51,547 psi | 81% | 3307 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 41% | 1864 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,280 psi | 69% | 3077 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 45,672 psi | 72% | 3133 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,727 psi | 64% | 2982 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,936 psi | 77% | 3127 fps | 95.4% |
| IMR 4350 | <<locked>> | 96% | 50,995 psi | 80% | 3209 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 49,240 psi | 77% | 3159 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 37,463 psi | 59% | 2969 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,366 psi | 66% | 3074 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 47,718 psi | 75% | 3133 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 44,889 psi | 70% | 3094 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 45,585 psi | 71% | 3054 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 40,770 psi | 64% | 2992 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 42,859 psi | 67% | 3031 fps | 95.3% |
| Lovex S070 | <<locked>> | 92% | 46,267 psi | 73% | 3123 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,788 psi | 70% | 3071 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 45,107 psi | 71% | 3081 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,727 psi | 64% | 3028 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 38,899 psi | 61% | 3018 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 40,306 psi | 63% | 3035 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 92% | 43,366 psi | 68% | 3127 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 47,688 psi | 75% | 3130 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,500 psi | 74% | 3159 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,459 psi | 81% | 3182 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 42% | 1903 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,403 psi | 84% | 3228 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,918 psi | 70% | 3077 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,613 psi | 68% | 3156 fps | 97.6% |
| ReloadSwiss RS 60 | 39.4 gr | 80% | 35,418 psi | 56% | 2995 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 38,551 psi | 60% | 3031 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,263 psi | 65% | 3110 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 48,588 psi | 76% | 3123 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,409 psi | 66% | 3009 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,969 psi | 56% | 2904 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 50,415 psi | 79% | 3179 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,859 psi | 67% | 3031 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,889 psi | 70% | 3094 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 40,770 psi | 64% | 2992 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 92% | 46,267 psi | 73% | 3123 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,883 psi | 58% | 2956 fps | 96.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,035 psi | 72% | 3100 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,150 psi | 69% | 3081 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,774 psi | 72% | 3018 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,130 psi | 60% | 2861 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 48,617 psi | 76% | 3094 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,692 psi | 81% | 3219 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 45,672 psi | 72% | 3022 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,716 psi | 72% | 3097 fps | 98.5% |
| Somchem S355 | <<locked>> | 80% | 36,782 psi | 58% | 2913 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 30,371 psi | 48% | 2825 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 51,576 psi | 81% | 3094 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,093 psi | 72% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,858 psi | 66% | 2995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,699 psi | 67% | 3005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,998 psi | 55% | 2841 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 86% | 38,014 psi | 60% | 2959 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 47,906 psi | 75% | 3130 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 41,176 psi | 65% | 2986 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 39,987 psi | 63% | 3022 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 36,274 psi | 57% | 2999 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 33,330 psi | 52% | 2808 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 47,601 psi | 75% | 3176 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 47,703 psi | 75% | 3212 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,837 psi | 53% | 3002 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,671 psi | 68% | 3081 fps | 98.7% |
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 113 powders for .243 WSSM loaded with the .243 | 80gr | Berger Varmint. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,461 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,461 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .243 WSSM with the .243 | 80gr | Berger Varmint they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.