Load Specifications
Load data in caliber .243 WSSM with .243 | 90gr | SUS-TAC HPT bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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>> | 84% | 57,014 psi | 89% | 3028 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,463 psi | 88% | 3058 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,128 psi | 85% | 3071 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,187 psi | 86% | 3054 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,511 psi | 68% | 2936 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 56,260 psi | 88% | 3107 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,536 psi | 89% | 3199 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 56,275 psi | 88% | 3140 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,537 psi | 90% | 3143 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,085 psi | 86% | 3084 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,188 psi | 88% | 3058 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,217 psi | 88% | 3268 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,667 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,636 psi | 86% | 3133 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3255 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,332 psi | 87% | 3241 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,205 psi | 65% | 2966 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,557 psi | 73% | 3146 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,376 psi | 88% | 3153 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 54,810 psi | 86% | 3123 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,897 psi | 86% | 3091 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,927 psi | 89% | 3071 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,027 psi | 86% | 3120 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,855 psi | 89% | 3225 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 55,550 psi | 87% | 3133 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 55,419 psi | 87% | 3189 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 55,985 psi | 88% | 3150 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 56,869 psi | 89% | 3153 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,925 psi | 85% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,579 psi | 89% | 3182 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,202 psi | 88% | 3228 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,636 psi | 86% | 3097 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,927 psi | 89% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,811 psi | 89% | 3120 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,826 psi | 89% | 3100 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 55,332 psi | 87% | 3117 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,869 psi | 89% | 3127 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3186 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 56,057 psi | 88% | 3163 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,085 psi | 86% | 3084 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,521 psi | 89% | 3117 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,709 psi | 87% | 3061 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 56,797 psi | 89% | 3117 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,144 psi | 88% | 3117 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 57,116 psi | 90% | 3153 fps | 98.2% |
| Norma 201 | <<locked>> | 86% | 55,129 psi | 86% | 3084 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,651 psi | 87% | 3084 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,493 psi | 90% | 3176 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,927 psi | 88% | 3169 fps | 96% |
| Norma URP | <<locked>> | 98% | 55,172 psi | 86% | 3179 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 54,389 psi | 85% | 3140 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,157 psi | 85% | 3173 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 55,434 psi | 87% | 3100 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,405 psi | 87% | 3127 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,101 psi | 88% | 3087 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 56% | 1982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,014 psi | 88% | 3120 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,405 psi | 87% | 3205 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,085 psi | 86% | 3241 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,420 psi | 88% | 3222 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,550 psi | 87% | 3245 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 55,999 psi | 88% | 3064 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,579 psi | 87% | 3081 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,665 psi | 86% | 3114 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,897 psi | 86% | 3091 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,144 psi | 88% | 3117 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,521 psi | 89% | 3117 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,797 psi | 89% | 3117 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,116 psi | 90% | 3153 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,594 psi | 89% | 3182 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,954 psi | 85% | 3077 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,969 psi | 86% | 3110 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,594 psi | 89% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,985 psi | 89% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,405 psi | 88% | 3068 fps | 97.8% |
| Somchem S321 | <<locked>> | 82% | 56,594 psi | 89% | 3120 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,883 psi | 88% | 3015 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,450 psi | 90% | 3130 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,027 psi | 86% | 3114 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3189 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,792 psi | 78% | 3051 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 56,057 psi | 88% | 2976 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,869 psi | 89% | 3002 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,492 psi | 87% | 3045 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,347 psi | 88% | 3061 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,492 psi | 89% | 3091 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,114 psi | 85% | 3117 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 55,579 psi | 87% | 3084 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,259 psi | 85% | 3051 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,217 psi | 90% | 3186 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,513 psi | 71% | 3051 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,708 psi | 86% | 3100 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,043 psi | 88% | 3140 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,825 psi | 87% | 3196 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,014 psi | 58% | 2969 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,868 psi | 86% | 3117 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% | 50,299 psi | 79% | 2930 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,265 psi | 68% | 2851 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,633 psi | 79% | 3015 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,182 psi | 76% | 2927 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 40,524 psi | 64% | 2874 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,915 psi | 64% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,592 psi | 54% | 2759 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 46,702 psi | 73% | 2969 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,465 psi | 62% | 2799 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,762 psi | 76% | 2979 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,240 psi | 77% | 2959 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,699 psi | 67% | 3002 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,392 psi | 62% | 2828 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,351 psi | 66% | 2897 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,780 psi | 55% | 2779 fps | 95.2% |
| Alliant Reloder-17 | 37 gr | 80% | 34,142 psi | 54% | 2789 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 32,155 psi | 50% | 2730 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,710 psi | 59% | 2936 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,151 psi | 72% | 2972 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 39,334 psi | 62% | 2835 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 48,544 psi | 76% | 2979 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,154 psi | 79% | 2963 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,964 psi | 75% | 3002 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,200 psi | 83% | 3163 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,871 psi | 62% | 2831 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 45,397 psi | 71% | 3002 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 90% | 49,211 psi | 77% | 3028 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,152 psi | 74% | 2982 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,994 psi | 47% | 2608 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,062 psi | 67% | 2943 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 90% | 45,353 psi | 71% | 3022 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 42% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,252 psi | 71% | 2930 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 46,978 psi | 74% | 2976 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,452 psi | 65% | 2838 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,990 psi | 69% | 2861 fps | 95% |
| IMR 4350 | <<locked>> | 94% | 48,646 psi | 76% | 3002 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,411 psi | 70% | 2897 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 35,984 psi | 56% | 2779 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 43,410 psi | 68% | 2933 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 48,762 psi | 76% | 2979 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,905 psi | 72% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,311 psi | 73% | 2897 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 41,539 psi | 65% | 2844 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 38,682 psi | 61% | 2776 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 44,715 psi | 70% | 2930 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,643 psi | 72% | 2917 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 46,035 psi | 72% | 2923 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,742 psi | 65% | 2887 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 52,272 psi | 82% | 3107 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 34,809 psi | 55% | 2762 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 41,481 psi | 65% | 2900 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,655 psi | 65% | 2930 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,559 psi | 76% | 2979 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,370 psi | 76% | 3005 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,678 psi | 83% | 3031 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 42% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,047 psi | 67% | 2877 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,701 psi | 70% | 3009 fps | 98.6% |
| ReloadSwiss RS 60 | 37 gr | 80% | 36,303 psi | 57% | 2864 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,840 psi | 58% | 2838 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,363 psi | 62% | 2913 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,603 psi | 78% | 2963 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,410 psi | 68% | 2864 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 36,898 psi | 58% | 2772 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 48,544 psi | 76% | 2979 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,682 psi | 61% | 2776 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,905 psi | 72% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,539 psi | 65% | 2844 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 44,715 psi | 70% | 2930 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,782 psi | 59% | 2822 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,992 psi | 74% | 2953 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,049 psi | 71% | 2933 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,978 psi | 74% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,262 psi | 62% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,584 psi | 68% | 2835 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 53,098 psi | 83% | 3064 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,499 psi | 73% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,963 psi | 74% | 2956 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 37,594 psi | 59% | 2776 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 27,441 psi | 43% | 2589 fps | 95.4% |
| Somchem S385 | <<locked>> | 98% | 46,543 psi | 73% | 2992 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,910 psi | 83% | 2933 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,369 psi | 74% | 2861 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,192 psi | 68% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,627 psi | 68% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,824 psi | 56% | 2707 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 36,347 psi | 57% | 2766 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 49,023 psi | 77% | 2976 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 41,959 psi | 66% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,824 psi | 56% | 2766 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 32,619 psi | 51% | 2753 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,836 psi | 50% | 2625 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 48,718 psi | 76% | 3022 fps | 100% |
| Winchester 760 | 40.8 gr | 90% | 45,716 psi | 72% | 3009 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,458 psi | 48% | 2756 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,773 psi | 70% | 2940 fps | 99.4% |
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 | SUS-TAC HPT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,268 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 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .243 WSSM with the .243 | 90gr | SUS-TAC HPT 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.