Load Specifications
Load data in caliber .243 WSSM with .243 | 90gr | Hornady ELD-X bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and ReloadSwiss RS 60.
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 2015 | <<locked>> | 82% | 54,737 psi | 86% | 3002 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,392 psi | 90% | 3074 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,940 psi | 86% | 3087 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,217 psi | 88% | 3077 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,483 psi | 70% | 2959 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 57,522 psi | 90% | 3130 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,725 psi | 90% | 3219 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 57,058 psi | 89% | 3159 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,650 psi | 86% | 3100 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,869 psi | 88% | 3104 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,246 psi | 90% | 3077 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,348 psi | 90% | 3294 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,143 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,419 psi | 87% | 3150 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,984 psi | 86% | 3225 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,376 psi | 88% | 3261 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2989 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,747 psi | 75% | 3176 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,406 psi | 90% | 3176 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 55,970 psi | 88% | 3146 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,506 psi | 87% | 3110 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,711 psi | 90% | 3087 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,782 psi | 87% | 3136 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,623 psi | 89% | 3159 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 56,463 psi | 88% | 3212 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 57,029 psi | 89% | 3173 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 57,711 psi | 90% | 3169 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,027 psi | 86% | 3143 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,157 psi | 85% | 3153 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,479 psi | 90% | 3255 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 56% | 1946 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,434 psi | 87% | 3117 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,505 psi | 85% | 3100 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,580 psi | 90% | 3140 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,479 psi | 90% | 3120 fps | 98.1% |
| IMR 4350 | <<locked>> | 98% | 56,260 psi | 88% | 3140 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,450 psi | 90% | 3146 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 54,273 psi | 85% | 3150 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 56,855 psi | 89% | 3182 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,869 psi | 88% | 3104 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,348 psi | 90% | 3133 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,449 psi | 88% | 3081 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,580 psi | 90% | 3133 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,145 psi | 90% | 3140 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 54,868 psi | 86% | 3123 fps | 97.9% |
| Norma 201 | <<locked>> | 86% | 55,927 psi | 88% | 3100 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,492 psi | 89% | 3100 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,636 psi | 86% | 3136 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 57,290 psi | 90% | 3199 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 47,456 psi | 74% | 3127 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 56,260 psi | 88% | 3202 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 55,492 psi | 87% | 3163 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 55,521 psi | 87% | 3202 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 56,449 psi | 88% | 3123 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,115 psi | 88% | 3143 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,782 psi | 89% | 3104 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1991 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,029 psi | 89% | 3143 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,217 psi | 88% | 3225 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,782 psi | 87% | 3255 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,508 psi | 90% | 3241 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,884 psi | 89% | 3274 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 56,913 psi | 89% | 3084 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,391 psi | 88% | 3097 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,840 psi | 88% | 3136 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,506 psi | 87% | 3110 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,145 psi | 90% | 3140 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,348 psi | 90% | 3133 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,580 psi | 90% | 3133 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,868 psi | 86% | 3123 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,667 psi | 90% | 3202 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,027 psi | 86% | 3104 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,709 psi | 87% | 3127 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,014 psi | 89% | 3031 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,740 psi | 90% | 3031 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,377 psi | 90% | 3087 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 57,305 psi | 90% | 3136 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,637 psi | 89% | 3028 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,549 psi | 85% | 3091 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 55,782 psi | 87% | 3130 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 3209 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3074 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 56,985 psi | 89% | 2995 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,305 psi | 90% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,405 psi | 88% | 3061 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,101 psi | 89% | 3077 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,609 psi | 90% | 3110 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,187 psi | 86% | 3143 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 56,811 psi | 89% | 3107 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,390 psi | 87% | 3071 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,549 psi | 85% | 3150 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,543 psi | 73% | 3074 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,492 psi | 87% | 3117 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,855 psi | 89% | 3156 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,898 psi | 89% | 3219 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,942 psi | 59% | 3002 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,593 psi | 87% | 3133 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% | 51,227 psi | 80% | 2949 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,179 psi | 69% | 2871 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,459 psi | 81% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,124 psi | 77% | 2953 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 41,437 psi | 65% | 2897 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,771 psi | 65% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,346 psi | 55% | 2782 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 47,500 psi | 74% | 2989 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,219 psi | 63% | 2822 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,574 psi | 78% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,285 psi | 79% | 2979 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,381 psi | 68% | 3025 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,190 psi | 63% | 2851 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,134 psi | 68% | 2920 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,389 psi | 55% | 2802 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,737 psi | 54% | 2812 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,864 psi | 48% | 2694 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 38,421 psi | 60% | 2959 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,862 psi | 73% | 2992 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 39,798 psi | 62% | 2851 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 46,137 psi | 72% | 2936 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,937 psi | 80% | 2979 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,733 psi | 76% | 3018 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,553 psi | 64% | 2851 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 88% | 43,424 psi | 68% | 2966 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 50,183 psi | 79% | 3054 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 47,950 psi | 75% | 3002 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,574 psi | 48% | 2631 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,845 psi | 69% | 2966 fps | 99.5% |
| Hodgdon Superformance | 44.7 gr | 90% | 46,122 psi | 72% | 3045 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 42% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,687 psi | 72% | 2943 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 47,572 psi | 75% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,250 psi | 66% | 2861 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,672 psi | 70% | 2881 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 46,514 psi | 73% | 2963 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,034 psi | 71% | 2917 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 34,301 psi | 54% | 2740 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 44,193 psi | 69% | 2953 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 49,574 psi | 78% | 2999 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,760 psi | 73% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,094 psi | 74% | 2917 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 42,351 psi | 66% | 2867 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,349 psi | 62% | 2795 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 42,511 psi | 67% | 2887 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 46,441 psi | 73% | 2936 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,847 psi | 73% | 2943 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,496 psi | 67% | 2907 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 53,171 psi | 83% | 3127 fps | 95.5% |
| Norma MRP | <<locked>> | 98% | 44,077 psi | 69% | 3054 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 35,491 psi | 56% | 2782 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 42,177 psi | 66% | 2917 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 42,206 psi | 66% | 2949 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 49,559 psi | 78% | 3005 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,139 psi | 77% | 3025 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,417 psi | 84% | 3051 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 42% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,002 psi | 64% | 2835 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,571 psi | 71% | 3031 fps | 98.8% |
| ReloadSwiss RS 60 | 37.6 gr | 80% | 36,941 psi | 58% | 2884 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,056 psi | 55% | 2795 fps | 95% |
| ReloadSwiss RS 70 | 41.1 gr | 86% | 37,652 psi | 59% | 2874 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,502 psi | 79% | 2982 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,222 psi | 69% | 2884 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,666 psi | 59% | 2795 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 46,137 psi | 72% | 2936 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,349 psi | 62% | 2795 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,760 psi | 73% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,351 psi | 66% | 2867 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,511 psi | 67% | 2887 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,508 psi | 60% | 2841 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,008 psi | 75% | 2979 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,759 psi | 72% | 2949 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,471 psi | 74% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,682 psi | 62% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,164 psi | 69% | 2851 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 53,809 psi | 84% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,282 psi | 74% | 2884 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,703 psi | 75% | 2972 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 38,348 psi | 60% | 2799 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 28,036 psi | 44% | 2612 fps | 95.9% |
| Somchem S385 | <<locked>> | 98% | 47,442 psi | 74% | 3015 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 53,461 psi | 84% | 2943 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,848 psi | 75% | 2871 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,772 psi | 69% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,411 psi | 70% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,550 psi | 57% | 2730 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 34,592 psi | 54% | 2726 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 49,443 psi | 77% | 2989 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,641 psi | 67% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,753 psi | 58% | 2792 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 33,286 psi | 52% | 2772 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,329 psi | 51% | 2641 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 49,530 psi | 78% | 3041 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,424 psi | 68% | 2966 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,067 psi | 49% | 2782 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,484 psi | 71% | 2956 fps | 99.5% |
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 97 powders for .243 WSSM loaded with the .243 | 90gr | Hornady ELD-X. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,294 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 90.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .243 WSSM with the .243 | 90gr | Hornady ELD-X 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.