Load Specifications
Load data in caliber .243 WSSM with .243 | 85gr | Barnes Solid BT bullet and 96 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% | 56,478 psi | 89% | 3110 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,535 psi | 87% | 3136 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,566 psi | 90% | 3212 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,447 psi | 85% | 3123 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 55,637 psi | 87% | 3186 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,680 psi | 87% | 3271 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 55,811 psi | 87% | 3219 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,898 psi | 89% | 3219 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,752 psi | 86% | 3166 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,492 psi | 87% | 3143 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,709 psi | 87% | 3346 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,594 psi | 89% | 3235 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,956 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,595 psi | 90% | 3268 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3337 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,520 psi | 85% | 3314 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,915 psi | 64% | 3035 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,209 psi | 72% | 3215 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,927 psi | 88% | 3235 fps | 99.5% |
| Bofors RP3 | <<locked>> | 90% | 54,012 psi | 85% | 3199 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,696 psi | 90% | 3222 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,304 psi | 88% | 3150 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,404 psi | 85% | 3199 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,115 psi | 88% | 3304 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 90% | 55,158 psi | 86% | 3215 fps | 99% |
| Hodgdon H414 | <<locked>> | 96% | 55,042 psi | 86% | 3264 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 94% | 55,463 psi | 87% | 3225 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 56,434 psi | 88% | 3232 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3199 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,130 psi | 88% | 3264 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,840 psi | 88% | 3301 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 56% | 2005 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,230 psi | 85% | 3179 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 56,536 psi | 89% | 3219 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,318 psi | 88% | 3202 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,260 psi | 88% | 3176 fps | 97.5% |
| IMR 4350 | <<locked>> | 98% | 54,708 psi | 86% | 3189 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,072 psi | 88% | 3199 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 3264 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 55,448 psi | 87% | 3245 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,752 psi | 86% | 3166 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,869 psi | 88% | 3196 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,056 psi | 86% | 3140 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 56,231 psi | 88% | 3199 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,666 psi | 87% | 3196 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 56,855 psi | 89% | 3235 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 54,346 psi | 85% | 3159 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,882 psi | 86% | 3163 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,753 psi | 89% | 3251 fps | 99.9% |
| Norma URP | <<locked>> | 98% | 54,926 psi | 86% | 3261 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 88% | 53,911 psi | 84% | 3219 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3310 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 55,172 psi | 86% | 3182 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,737 psi | 86% | 3202 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,579 psi | 87% | 3166 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 56% | 2051 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,566 psi | 90% | 3199 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,172 psi | 86% | 3186 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,679 psi | 86% | 3284 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,418 psi | 85% | 3320 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,782 psi | 87% | 3294 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,969 psi | 86% | 3320 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 84% | 55,492 psi | 87% | 3146 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,187 psi | 86% | 3163 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,259 psi | 85% | 3196 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,696 psi | 90% | 3222 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,666 psi | 87% | 3196 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,869 psi | 88% | 3196 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,231 psi | 88% | 3199 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,855 psi | 89% | 3235 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,999 psi | 88% | 3258 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,217 psi | 90% | 3215 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,375 psi | 85% | 3189 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,014 psi | 88% | 3100 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,130 psi | 88% | 3091 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,825 psi | 87% | 3140 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 56,028 psi | 88% | 3199 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,172 psi | 86% | 3091 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,029 psi | 89% | 3209 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 54,346 psi | 85% | 3189 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3258 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 55,303 psi | 87% | 3058 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,275 psi | 88% | 3084 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,723 psi | 86% | 3123 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,796 psi | 87% | 3140 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,086 psi | 88% | 3169 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,145 psi | 90% | 3251 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 55,187 psi | 86% | 3166 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,479 psi | 90% | 3186 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,376 psi | 88% | 3258 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,107 psi | 71% | 3120 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,725 psi | 90% | 3225 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,434 psi | 87% | 3219 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,042 psi | 86% | 3264 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,564 psi | 57% | 3025 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,172 psi | 85% | 3192 fps | 99.9% |
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% | 49,995 psi | 78% | 3012 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,830 psi | 67% | 2927 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,850 psi | 78% | 3087 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 51,140 psi | 80% | 3064 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,495 psi | 63% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,709 psi | 58% | 2887 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 46,209 psi | 72% | 3045 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 39,189 psi | 61% | 2871 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,283 psi | 76% | 3054 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,791 psi | 76% | 3041 fps | 100% |
| Alliant Power Pro 2000-MR | 38.7 gr | 80% | 42,018 psi | 66% | 3068 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,775 psi | 73% | 3058 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,015 psi | 61% | 2897 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,872 psi | 66% | 2969 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,593 psi | 57% | 2900 fps | 95.4% |
| Alliant Reloder-17 | 38.1 gr | 80% | 33,634 psi | 53% | 2848 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,720 psi | 50% | 2782 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,827 psi | 62% | 3064 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,397 psi | 71% | 3038 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 38,827 psi | 61% | 2900 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 47,718 psi | 75% | 3041 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,763 psi | 78% | 3041 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,210 psi | 74% | 3071 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,214 psi | 82% | 3235 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 80% | 39,349 psi | 62% | 2897 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 90% | 44,976 psi | 70% | 3074 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 52,098 psi | 82% | 3163 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 46,630 psi | 73% | 3054 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,444 psi | 49% | 2723 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,714 psi | 67% | 3022 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 92% | 48,356 psi | 76% | 3163 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 42% | 1798 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,469 psi | 70% | 2995 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 46,195 psi | 72% | 3051 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,104 psi | 64% | 2910 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 46,369 psi | 73% | 2989 fps | 95.2% |
| IMR 4350 | <<locked>> | 94% | 48,225 psi | 76% | 3071 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,557 psi | 73% | 3022 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 35,360 psi | 55% | 2835 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,902 psi | 67% | 3005 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 48,283 psi | 76% | 3054 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 45,600 psi | 71% | 3022 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,963 psi | 72% | 2972 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 41,176 psi | 65% | 2917 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 40,698 psi | 64% | 2900 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 47,021 psi | 74% | 3054 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 45,252 psi | 71% | 2992 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 45,585 psi | 71% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,234 psi | 65% | 2953 fps | 98% |
| Norma URP | <<locked>> | 86% | 36,898 psi | 58% | 2890 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,785 psi | 64% | 2963 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 43,961 psi | 69% | 3058 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,182 psi | 76% | 3051 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,645 psi | 75% | 3074 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,953 psi | 81% | 3104 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 42% | 1837 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,056 psi | 85% | 3146 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 45,440 psi | 71% | 3002 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,048 psi | 69% | 3081 fps | 98.1% |
| ReloadSwiss RS 60 | 38.1 gr | 80% | 35,766 psi | 56% | 2923 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 39,073 psi | 61% | 2969 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,843 psi | 66% | 3045 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 48,950 psi | 77% | 3038 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,076 psi | 68% | 2940 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 36,463 psi | 57% | 2838 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 47,718 psi | 75% | 3041 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,698 psi | 64% | 2900 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,600 psi | 71% | 3022 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,176 psi | 65% | 2917 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 47,021 psi | 74% | 3054 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,231 psi | 58% | 2884 fps | 96.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,557 psi | 73% | 3025 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,454 psi | 70% | 3002 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,369 psi | 73% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,725 psi | 61% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 46,006 psi | 72% | 2959 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 52,257 psi | 82% | 3136 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,137 psi | 72% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,195 psi | 72% | 3022 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 37,246 psi | 58% | 2844 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 28,950 psi | 45% | 2707 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 52,272 psi | 82% | 3009 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,760 psi | 73% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,554 psi | 67% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,221 psi | 68% | 2927 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,462 psi | 56% | 2772 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 38,479 psi | 60% | 2890 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,486 psi | 76% | 3051 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 41,452 psi | 65% | 2907 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 37,855 psi | 59% | 2890 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 92% | 34,389 psi | 54% | 2874 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,343 psi | 49% | 2677 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 48,370 psi | 76% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,976 psi | 70% | 3074 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 32,227 psi | 51% | 2881 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,092 psi | 69% | 3005 fps | 99% |
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 114 powders for .243 WSSM loaded with the .243 | 85gr | Barnes Solid BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,346 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,346 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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 | 85gr | Barnes Solid BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate High Country, 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.