Load Specifications
Bullet Manufacturer:TWENTY-NINE
Bullet Weight:76 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:1:8.5
Load data in caliber .243 WSSM with .243 | 76gr | TWENTY-NINE ERTP bullet and 98 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>> | 86% | 55,912 psi | 88% | 3268 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,259 psi | 85% | 3284 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,346 psi | 85% | 3281 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,463 psi | 88% | 3353 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,288 psi | 85% | 3327 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3392 fps | 98.5% |
| ADI AR 2206H | <<locked>> | 88% | 55,100 psi | 86% | 3363 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 94% | 55,927 psi | 88% | 3353 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,696 psi | 90% | 3373 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 54,462 psi | 85% | 3297 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,448 psi | 87% | 3432 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,563 psi | 86% | 3478 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,941 psi | 88% | 3379 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,085 psi | 86% | 3274 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,608 psi | 89% | 3402 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3392 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,145 psi | 90% | 3510 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,595 psi | 90% | 3241 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,940 psi | 86% | 3366 fps | 98.7% |
| Bofors RP3 | <<locked>> | 94% | 56,898 psi | 89% | 3399 fps | 99.9% |
| Bofors RP7 | <<locked>> | 98% | 56,971 psi | 89% | 3350 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,999 psi | 88% | 3301 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,276 psi | 90% | 3402 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,245 psi | 87% | 3445 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 82% | 54,505 psi | 85% | 3314 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,811 psi | 87% | 3340 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,172 psi | 85% | 3343 fps | 98% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3448 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 55,680 psi | 87% | 3376 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,080 psi | 75% | 3251 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,882 psi | 86% | 3402 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 55% | 2106 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,724 psi | 89% | 3373 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 55,071 psi | 86% | 3363 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,666 psi | 87% | 3340 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,898 psi | 88% | 3310 fps | 96.2% |
| IMR 4198 | <<locked>> | 82% | 55,172 psi | 86% | 3232 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,463 psi | 87% | 3327 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,053 psi | 80% | 3317 fps | 98.1% |
| IMR 4895 | <<locked>> | 90% | 54,520 psi | 85% | 3383 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 88% | 57,696 psi | 90% | 3373 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 54,404 psi | 85% | 3294 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,694 psi | 86% | 3337 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,752 psi | 86% | 3284 fps | 99.3% |
| Lovex S062 | <<locked>> | 92% | 55,042 psi | 86% | 3333 fps | 99.9% |
| Lovex S065 | <<locked>> | 98% | 54,447 psi | 85% | 3317 fps | 97.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3350 fps | 96.4% |
| Norma 201 | <<locked>> | 90% | 57,246 psi | 90% | 3360 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 57,682 psi | 90% | 3363 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,767 psi | 87% | 3389 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 53,055 psi | 83% | 3376 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 92% | 56,550 psi | 89% | 3415 fps | 99.5% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3363 fps | 96.5% |
| Ramshot TAC | <<locked>> | 86% | 54,520 psi | 85% | 3314 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,725 psi | 90% | 3402 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,042 psi | 86% | 3304 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,433 psi | 56% | 2156 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,087 psi | 89% | 3350 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,708 psi | 86% | 3320 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,985 psi | 89% | 3478 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,652 psi | 89% | 3514 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,896 psi | 84% | 3412 fps | 98.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,114 psi | 85% | 3442 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 86% | 54,607 psi | 86% | 3294 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,711 psi | 90% | 3356 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,260 psi | 88% | 3383 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 98% | 56,971 psi | 89% | 3350 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,447 psi | 85% | 3317 fps | 97.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,694 psi | 86% | 3337 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,042 psi | 86% | 3333 fps | 99.9% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3350 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,913 psi | 89% | 3317 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,723 psi | 86% | 3389 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,028 psi | 88% | 3301 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,739 psi | 89% | 3353 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,058 psi | 89% | 3383 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,361 psi | 87% | 3245 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,622 psi | 87% | 3238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,158 psi | 86% | 3261 fps | 96% |
| Somchem S321 | <<locked>> | 84% | 55,608 psi | 87% | 3350 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 54,694 psi | 86% | 3238 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,072 psi | 88% | 3343 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 56,898 psi | 89% | 3386 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,674 psi | 75% | 3320 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 84% | 55,114 psi | 86% | 3212 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,506 psi | 87% | 3232 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,058 psi | 89% | 3320 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,665 psi | 86% | 3281 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,694 psi | 86% | 3301 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3376 fps | 98.6% |
| Vihtavuori N530 | <<locked>> | 86% | 54,621 psi | 86% | 3310 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 92% | 56,681 psi | 89% | 3330 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3383 fps | 98.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,045 psi | 63% | 3150 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3360 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,418 psi | 85% | 3363 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 3455 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,072 psi | 89% | 3392 fps | 99.8% |
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% | 46,354 psi | 73% | 3107 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,894 psi | 80% | 3225 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,769 psi | 61% | 2995 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,745 psi | 72% | 3166 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 36,593 psi | 57% | 2972 fps | 99.2% |
| Accurate 4350 | <<locked>> | 92% | 40,712 psi | 64% | 3120 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,482 psi | 67% | 3107 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 38,406 psi | 60% | 2986 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,483 psi | 70% | 3123 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,222 psi | 69% | 3130 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,880 psi | 81% | 3366 fps | 99.3% |
| Alliant Power Pro 2000-MR | 39.7 gr | 82% | 41,495 psi | 65% | 3189 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,505 psi | 56% | 2946 fps | 96.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,953 psi | 81% | 3222 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,218 psi | 60% | 3018 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,495 psi | 63% | 3133 fps | 95.3% |
| Alliant Reloder-17 | 40 gr | 84% | 35,259 psi | 55% | 3018 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,896 psi | 84% | 3186 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,771 psi | 65% | 3100 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 35,114 psi | 55% | 2946 fps | 96.1% |
| Bofors RP7 | <<locked>> | 96% | 53,432 psi | 84% | 3287 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,499 psi | 73% | 3123 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,352 psi | 68% | 3143 fps | 99% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,718 psi | 75% | 3301 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 50,995 psi | 80% | 3255 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,996 psi | 81% | 3274 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 44,222 psi | 69% | 3146 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 98% | 53,650 psi | 84% | 3386 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 80% | 42,815 psi | 67% | 3120 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,737 psi | 54% | 2943 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,986 psi | 61% | 3077 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,918 psi | 41% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,191 psi | 65% | 3064 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 42,206 psi | 66% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,014 psi | 60% | 2972 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,504 psi | 82% | 3245 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,040 psi | 82% | 3182 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,156 psi | 82% | 3268 fps | 95.2% |
| IMR 4831 | <<locked>> | 94% | 41,800 psi | 66% | 3127 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 39,146 psi | 61% | 3058 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,483 psi | 70% | 3123 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,647 psi | 79% | 3228 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 41,365 psi | 65% | 3084 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 42,627 psi | 67% | 3041 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 37,695 psi | 59% | 2972 fps | 97.3% |
| Lovex S065 | <<locked>> | 92% | 45,324 psi | 71% | 3136 fps | 95.1% |
| Lovex S070 | <<locked>> | 98% | 51,953 psi | 81% | 3287 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,553 psi | 65% | 3058 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 41,756 psi | 65% | 3071 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 37,637 psi | 59% | 3005 fps | 95.8% |
| Norma URP | <<locked>> | 92% | 40,640 psi | 64% | 3117 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 37,275 psi | 58% | 3012 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 98% | 49,023 psi | 77% | 3301 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 44,730 psi | 70% | 3120 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,976 psi | 69% | 3140 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,385 psi | 76% | 3182 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 41% | 1932 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,908 psi | 78% | 3228 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,964 psi | 75% | 3189 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,900 psi | 63% | 3133 fps | 95.8% |
| ReloadSwiss RS 60 | 38.1 gr | 80% | 32,822 psi | 51% | 2963 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 43,381 psi | 68% | 3202 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 43,918 psi | 69% | 3222 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,484 psi | 71% | 3123 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 39,581 psi | 62% | 2999 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 35,259 psi | 55% | 2943 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 96% | 53,432 psi | 84% | 3287 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 45,324 psi | 71% | 3136 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,365 psi | 65% | 3084 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 37,695 psi | 59% | 2972 fps | 97.3% |
| Shooters World SW4350 | <<locked>> | 98% | 51,953 psi | 81% | 3287 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,982 psi | 83% | 3251 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,608 psi | 57% | 3002 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,837 psi | 83% | 3248 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,917 psi | 67% | 3084 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,075 psi | 64% | 3068 fps | 96.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,192 psi | 68% | 3025 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,824 psi | 56% | 2861 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,605 psi | 81% | 3199 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 48,341 psi | 76% | 3215 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 42,612 psi | 67% | 3022 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 42,554 psi | 67% | 3084 fps | 97.2% |
| Somchem S355 | <<locked>> | 82% | 36,201 psi | 57% | 2953 fps | 95.9% |
| Somchem S365 | <<locked>> | 88% | 31,778 psi | 50% | 2920 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 48,834 psi | 77% | 3110 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,453 psi | 68% | 3028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,972 psi | 61% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,552 psi | 62% | 2999 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 32,184 psi | 50% | 2818 fps | 96% |
| Vihtavuori N160 | <<locked>> | 92% | 42,786 psi | 67% | 3127 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 44,570 psi | 70% | 3120 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 38,218 psi | 60% | 2979 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 92% | 42,163 psi | 66% | 3123 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 98% | 37,391 psi | 59% | 3084 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,273 psi | 55% | 2907 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 44,034 psi | 69% | 3166 fps | 99.3% |
| Winchester 760 | <<locked>> | 96% | 50,212 psi | 79% | 3320 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,538 psi | 64% | 3068 fps | 97.3% |
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 98 powders for .243 WSSM loaded with the .243 | 76gr | TWENTY-NINE ERTP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,514 fps; across all powders the maximum-charge window runs from 2,106 fps to 3,514 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 76.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon H414 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 | 76gr | TWENTY-NINE ERTP 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.