Load Specifications
Load data in caliber .243 WSSM with .243 | 90gr | Nosler Expansion Tip bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N160, Alliant Power Pro 2000-MR 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.
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% | 55,956 psi | 88% | 3022 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,389 psi | 85% | 3038 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,594 psi | 89% | 3114 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,215 psi | 85% | 3041 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 54,694 psi | 86% | 3091 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,201 psi | 87% | 3182 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 55,317 psi | 87% | 3130 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,695 psi | 89% | 3133 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,230 psi | 85% | 3077 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,201 psi | 87% | 3054 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,303 psi | 87% | 3255 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,086 psi | 88% | 3143 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,652 psi | 89% | 3153 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,305 psi | 90% | 3179 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3245 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,288 psi | 85% | 3228 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,161 psi | 63% | 2946 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,411 psi | 71% | 3127 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,419 psi | 87% | 3146 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 57,348 psi | 90% | 3169 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,130 psi | 90% | 3133 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,738 psi | 87% | 3058 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,653 psi | 90% | 3166 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,898 psi | 88% | 3215 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 54,433 psi | 85% | 3123 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 96% | 54,375 psi | 85% | 3176 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 94% | 55,085 psi | 86% | 3140 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 55,927 psi | 88% | 3140 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3107 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,593 psi | 87% | 3176 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,201 psi | 87% | 3215 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 56% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,464 psi | 90% | 3150 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,912 psi | 88% | 3123 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,956 psi | 88% | 3114 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,014 psi | 88% | 3094 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3163 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,622 psi | 87% | 3114 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3173 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 55,027 psi | 86% | 3153 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,230 psi | 85% | 3077 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,317 psi | 87% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,926 psi | 86% | 3054 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,709 psi | 87% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,071 psi | 86% | 3107 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 55,970 psi | 88% | 3140 fps | 98% |
| Norma 201 | <<locked>> | 88% | 57,246 psi | 90% | 3123 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,665 psi | 86% | 3074 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,478 psi | 89% | 3163 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,955 psi | 86% | 3156 fps | 95.8% |
| Norma URP | <<locked>> | 98% | 54,143 psi | 85% | 3166 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 90% | 57,479 psi | 90% | 3192 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,811 psi | 89% | 3222 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 54,549 psi | 85% | 3094 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,462 psi | 85% | 3117 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,216 psi | 87% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 56% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,000 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,027 psi | 86% | 3110 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,925 psi | 85% | 3186 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,708 psi | 84% | 3225 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,230 psi | 87% | 3209 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,592 psi | 86% | 3235 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 54,737 psi | 86% | 3054 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,476 psi | 85% | 3071 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,203 psi | 90% | 3159 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,130 psi | 90% | 3133 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,071 psi | 86% | 3107 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,317 psi | 87% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,709 psi | 87% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,970 psi | 88% | 3140 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,579 psi | 87% | 3173 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,942 psi | 89% | 3133 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,261 psi | 90% | 3153 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,288 psi | 87% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,753 psi | 87% | 3002 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,376 psi | 87% | 3054 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 55,564 psi | 87% | 3110 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,897 psi | 86% | 3005 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,492 psi | 89% | 3120 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 57,203 psi | 90% | 3153 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 3169 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 55,187 psi | 86% | 2972 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,622 psi | 87% | 2992 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,418 psi | 85% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,361 psi | 87% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,463 psi | 87% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,884 psi | 89% | 3169 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 54,665 psi | 86% | 3077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,869 psi | 89% | 3094 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,666 psi | 87% | 3169 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,222 psi | 69% | 3031 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,435 psi | 90% | 3143 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,694 psi | 86% | 3127 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,810 psi | 86% | 3182 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,897 psi | 56% | 2943 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,551 psi | 90% | 3163 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% | 49,240 psi | 77% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,669 psi | 65% | 2831 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,458 psi | 78% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,195 psi | 74% | 2917 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,465 psi | 62% | 2822 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,897 psi | 56% | 2802 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 45,411 psi | 71% | 2949 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,667 psi | 61% | 2789 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,529 psi | 74% | 2963 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,240 psi | 76% | 2949 fps | 100% |
| Alliant Power Pro 2000-MR | 37.7 gr | 80% | 41,800 psi | 66% | 2989 fps | 97.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,977 psi | 72% | 2966 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,421 psi | 60% | 2812 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,031 psi | 64% | 2877 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,984 psi | 56% | 2818 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,185 psi | 52% | 2769 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,154 psi | 49% | 2707 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,289 psi | 57% | 2904 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,904 psi | 70% | 2956 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 37,826 psi | 59% | 2808 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,181 psi | 74% | 2959 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,356 psi | 77% | 2953 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,905 psi | 74% | 2989 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,837 psi | 81% | 3146 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 38,783 psi | 61% | 2815 fps | 96% |
| Hodgdon H414 | <<locked>> | 90% | 44,411 psi | 70% | 2989 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 51,619 psi | 81% | 3081 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 45,832 psi | 72% | 2963 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,893 psi | 48% | 2644 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,134 psi | 66% | 2933 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 92% | 47,805 psi | 75% | 3077 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 41% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,077 psi | 69% | 2913 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 45,977 psi | 72% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,582 psi | 64% | 2825 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 46,093 psi | 72% | 2910 fps | 95.7% |
| IMR 4350 | <<locked>> | 94% | 47,703 psi | 75% | 2989 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,151 psi | 72% | 2940 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 34,621 psi | 54% | 2753 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,061 psi | 66% | 2910 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 47,529 psi | 74% | 2963 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 44,701 psi | 70% | 2930 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,527 psi | 71% | 2887 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 40,495 psi | 63% | 2831 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 40,234 psi | 63% | 2822 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 43,250 psi | 68% | 2904 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 44,512 psi | 70% | 2904 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,020 psi | 71% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,422 psi | 63% | 2864 fps | 98.2% |
| Norma 204 | <<locked>> | 96% | 51,300 psi | 80% | 3094 fps | 95% |
| Norma URP | <<locked>> | 86% | 36,274 psi | 57% | 2808 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,509 psi | 63% | 2884 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 40,625 psi | 64% | 2913 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,688 psi | 75% | 2969 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,456 psi | 74% | 2995 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,430 psi | 81% | 3015 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 41% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,388 psi | 84% | 3051 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,061 psi | 66% | 2861 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,714 psi | 69% | 2995 fps | 98.4% |
| ReloadSwiss RS 60 | 37.1 gr | 80% | 35,375 psi | 55% | 2844 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,752 psi | 56% | 2818 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,421 psi | 60% | 2894 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 48,327 psi | 76% | 2949 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,308 psi | 66% | 2851 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 35,708 psi | 56% | 2749 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,181 psi | 74% | 2959 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,234 psi | 63% | 2822 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,701 psi | 70% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,495 psi | 63% | 2831 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 43,250 psi | 68% | 2904 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,825 psi | 58% | 2805 fps | 97.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,905 psi | 72% | 2940 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,135 psi | 69% | 2920 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,774 psi | 72% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,087 psi | 60% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,165 psi | 71% | 2874 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 51,692 psi | 81% | 3048 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,498 psi | 71% | 2854 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,687 psi | 72% | 2936 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 36,506 psi | 57% | 2759 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 28,137 psi | 44% | 2618 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 51,677 psi | 81% | 2920 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,195 psi | 72% | 2844 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,814 psi | 66% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,699 psi | 67% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,824 psi | 55% | 2694 fps | 98.4% |
| Vihtavuori N160 | 37.1 gr | 84% | 35,346 psi | 55% | 2746 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,747 psi | 75% | 2959 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,973 psi | 64% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 37,260 psi | 58% | 2805 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 33,750 psi | 53% | 2792 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,734 psi | 48% | 2598 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 47,790 psi | 75% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,411 psi | 70% | 2989 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,415 psi | 49% | 2795 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,816 psi | 69% | 2927 fps | 99.2% |
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 115 powders for .243 WSSM loaded with the .243 | 90gr | Nosler Expansion Tip. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,255 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,255 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:8.5 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. Vihtavuori N160, Alliant Power Pro 2000-MR, ReloadSwiss RS 60 rank at the top here: for .243 WSSM with the .243 | 90gr | Nosler Expansion Tip 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.