Load Specifications
Bullet:.243 | 105gr | Berger BT
Bullet Manufacturer:Berger
Bullet Weight:105 gr
Bullet Diameter:0.243"
Bullet Length:<<locked>>
Caliber:.243 WSSM load data
Case Length (l3):1.663"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:53.9 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:9.0
Load data in caliber .243 WSSM with .243 | 105gr | Berger BT bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 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 2495 | <<locked>> | 84% | 56,376 psi | 88% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,653 psi | 90% | 2904 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2887 fps | 99.2% |
| Accurate 4064 | <<locked>> | 86% | 56,391 psi | 88% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,130 psi | 90% | 2999 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3087 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 82% | 55,680 psi | 87% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,753 psi | 89% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,346 psi | 85% | 2979 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,956 psi | 88% | 3048 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,563 psi | 86% | 2979 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,563 psi | 86% | 2979 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,392 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,375 psi | 85% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,128 psi | 85% | 2999 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,535 psi | 87% | 3028 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3028 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 2963 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,785 psi | 65% | 2818 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3100 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,347 psi | 87% | 2933 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,659 psi | 73% | 2887 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 54,839 psi | 86% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 2963 fps | 97.3% |
| Bofors RP7 | <<locked>> | 90% | 54,288 psi | 85% | 2894 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,653 psi | 90% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,274 psi | 87% | 2930 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,782 psi | 87% | 2995 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 55,811 psi | 87% | 2956 fps | 98.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2972 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 56,289 psi | 88% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,433 psi | 85% | 2920 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,275 psi | 88% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,738 psi | 87% | 3028 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,071 psi | 57% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,058 psi | 89% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,043 psi | 89% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,057 psi | 88% | 2904 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,405 psi | 87% | 2887 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,129 psi | 86% | 2927 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,709 psi | 87% | 2917 fps | 99% |
| IMR 4831 | <<locked>> | 96% | 57,392 psi | 90% | 2986 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,753 psi | 87% | 2946 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2963 fps | 96.6% |
| Lovex D073.6 | <<locked>> | 82% | 55,999 psi | 88% | 2890 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,578 psi | 86% | 2841 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,289 psi | 88% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,753 psi | 87% | 2913 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 56,927 psi | 89% | 2956 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,540 psi | 67% | 2733 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 54,418 psi | 85% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,042 psi | 86% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,203 psi | 90% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,927 psi | 88% | 2979 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 53,911 psi | 84% | 3054 fps | 99% |
| Norma URP | <<locked>> | 94% | 55,506 psi | 87% | 2976 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,157 psi | 85% | 2930 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,694 psi | 86% | 2982 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,208 psi | 69% | 2818 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,245 psi | 87% | 2913 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,216 psi | 87% | 2989 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,766 psi | 86% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,942 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,492 psi | 87% | 3048 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 54,897 psi | 86% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,665 psi | 86% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,449 psi | 88% | 2953 fps | 97% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3009 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 54,288 psi | 85% | 2894 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,753 psi | 87% | 2913 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,999 psi | 88% | 2890 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,289 psi | 88% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,927 psi | 89% | 2956 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,275 psi | 88% | 2966 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,739 psi | 89% | 2923 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,682 psi | 90% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,230 psi | 87% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,985 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,709 psi | 87% | 2867 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3002 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 54,969 psi | 86% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,304 psi | 88% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,824 psi | 86% | 2904 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,897 psi | 86% | 2986 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2982 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 55,709 psi | 87% | 2772 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,071 psi | 86% | 2818 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,724 psi | 87% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,173 psi | 88% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,346 psi | 85% | 2920 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 2848 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 86% | 57,348 psi | 90% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,043 psi | 89% | 2979 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 2986 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3041 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,954 psi | 85% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,782 psi | 87% | 2995 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,192 psi | 68% | 2953 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,273 psi | 85% | 2900 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2923 fps | 97.6% |
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 2495 | <<locked>> | 80% | 49,327 psi | 77% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,282 psi | 74% | 2733 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,201 psi | 57% | 2598 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 46,688 psi | 73% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,317 psi | 55% | 2595 fps | 97.3% |
| Accurate High Country | <<locked>> | 96% | 48,298 psi | 76% | 2956 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,228 psi | 82% | 2867 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,208 psi | 69% | 2713 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,846 psi | 70% | 2805 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,559 psi | 76% | 2927 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,802 psi | 70% | 2802 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,802 psi | 70% | 2802 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,643 psi | 70% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,790 psi | 75% | 2808 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,809 psi | 55% | 2608 fps | 97.5% |
| Alliant Reloder-17 | 37.2 gr | 80% | 39,044 psi | 61% | 2733 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,251 psi | 69% | 2795 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,280 psi | 69% | 2841 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,035 psi | 42% | 2408 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,722 psi | 54% | 2641 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 84% | 30,951 psi | 49% | 2582 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,938 psi | 81% | 2881 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,656 psi | 68% | 2825 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 44,933 psi | 70% | 2753 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,280 psi | 69% | 2841 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,566 psi | 62% | 2612 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,070 psi | 85% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,440 psi | 71% | 2759 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 37,289 psi | 58% | 2641 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 43,149 psi | 68% | 2726 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 52,199 psi | 82% | 2913 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 52,808 psi | 83% | 2877 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,111 psi | 50% | 2500 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,414 psi | 77% | 2858 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 38,914 psi | 61% | 2707 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,531 psi | 79% | 2825 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,287 psi | 84% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,441 psi | 73% | 2746 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,820 psi | 77% | 2776 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,321 psi | 63% | 2651 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,176 psi | 65% | 2651 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 34,156 psi | 54% | 2552 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 48,979 psi | 77% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,995 psi | 80% | 2854 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 52,446 psi | 82% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,184 psi | 80% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,731 psi | 73% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,580 psi | 60% | 2598 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 36,825 psi | 58% | 2575 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 34,824 psi | 55% | 2569 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 50,995 psi | 80% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,590 psi | 81% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,137 psi | 74% | 2795 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,455 psi | 71% | 2795 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 38,276 psi | 60% | 2740 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 35,259 psi | 55% | 2592 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,239 psi | 74% | 2815 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,666 psi | 57% | 2635 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 98% | 41,234 psi | 65% | 2756 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 43% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,339 psi | 71% | 2740 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,213 psi | 80% | 2923 fps | 100% |
| ReloadSwiss RS 60 | 37.2 gr | 80% | 41,510 psi | 65% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,027 psi | 55% | 2612 fps | 96.9% |
| ReloadSwiss RS 70 | 37.8 gr | 80% | 34,272 psi | 54% | 2615 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 48,573 psi | 76% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,192 psi | 66% | 2694 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,501 psi | 78% | 2838 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 43,250 psi | 68% | 2776 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 39,566 psi | 62% | 2612 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,580 psi | 60% | 2598 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,446 psi | 82% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,731 psi | 73% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,825 psi | 58% | 2575 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,120 psi | 68% | 2743 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,214 psi | 83% | 2867 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,459 psi | 79% | 2831 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,098 psi | 82% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,918 psi | 69% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,898 psi | 59% | 2543 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,844 psi | 67% | 2772 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,619 psi | 81% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,837 psi | 83% | 2854 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,598 psi | 67% | 2697 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,763 psi | 50% | 2549 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 41,321 psi | 65% | 2707 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,605 psi | 82% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,878 psi | 77% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,950 psi | 77% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,698 psi | 64% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,666 psi | 57% | 2595 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 94% | 40,466 psi | 63% | 2677 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 47,427 psi | 74% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,245 psi | 57% | 2595 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 29,602 psi | 46% | 2490 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 98% | 50,894 psi | 80% | 2976 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,955 psi | 56% | 2566 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 37,536 psi | 59% | 2648 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,469 psi | 40% | 2431 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,531 psi | 79% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,758 psi | 69% | 2746 fps | 95.2% |
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 102 powders for .243 WSSM loaded with the .243 | 105gr | Berger BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,100 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 105.0 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, Alliant Reloder-19 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .243 WSSM with the .243 | 105gr | Berger BT 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.