Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 66gr | SUS-TAC HPT bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Norma 203B.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 48,356 psi | 88% | 3353 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 46,630 psi | 84% | 3356 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 48,138 psi | 87% | 3412 fps | 99.7% |
| Accurate 4064 | <<locked>> | 90% | 49,922 psi | 90% | 3458 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,545 psi | 90% | 3497 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 84% | 47,572 psi | 86% | 3415 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 90% | 48,878 psi | 88% | 3419 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 49,821 psi | 90% | 3435 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 84% | 49,951 psi | 90% | 3442 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 46,949 psi | 85% | 3510 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 48,559 psi | 88% | 3445 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 88% | 48,994 psi | 89% | 3461 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 98% | 48,341 psi | 87% | 3507 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 49,023 psi | 89% | 3553 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,326 psi | 86% | 3412 fps | 96.4% |
| Bofors RP3 | <<locked>> | 90% | 48,863 psi | 88% | 3455 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 48,530 psi | 88% | 3369 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 84% | 49,023 psi | 89% | 3455 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 90% | 49,763 psi | 90% | 3455 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 84% | 47,964 psi | 87% | 3432 fps | 98.1% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,514 psi | 86% | 3432 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,079 psi | 85% | 3451 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,722 psi | 63% | 2277 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 49,400 psi | 89% | 3442 fps | 98.3% |
| IMR 3031 | <<locked>> | 84% | 47,268 psi | 86% | 3438 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,109 psi | 87% | 3396 fps | 97.2% |
| IMR 4831 | <<locked>> | 98% | 47,152 psi | 85% | 3428 fps | 96.3% |
| IMR 4895 | <<locked>> | 86% | 46,949 psi | 85% | 3432 fps | 97.5% |
| IMR 8208 XBR | <<locked>> | 84% | 49,821 psi | 90% | 3435 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 84% | 46,833 psi | 85% | 3392 fps | 99.5% |
| Lovex S060 | <<locked>> | 84% | 47,616 psi | 86% | 3346 fps | 97.6% |
| Lovex S062 | <<locked>> | 88% | 47,848 psi | 87% | 3402 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 49,690 psi | 90% | 3428 fps | 99% |
| Norma 202 | <<locked>> | 86% | 49,937 psi | 90% | 3442 fps | 100% |
| Norma 203B | <<locked>> | 88% | 48,254 psi | 87% | 3445 fps | 97.7% |
| Norma URP | <<locked>> | 98% | 49,081 psi | 89% | 3494 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 88% | 48,457 psi | 88% | 3461 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 49,879 psi | 90% | 3461 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 64% | 2333 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 48,646 psi | 88% | 3524 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,878 psi | 88% | 3570 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,371 psi | 89% | 3514 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 82% | 47,471 psi | 86% | 3369 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 88% | 50,009 psi | 90% | 3425 fps | 99% |
| Rottweil R 903 | <<locked>> | 92% | 48,718 psi | 88% | 3442 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 46,833 psi | 85% | 3392 fps | 99.5% |
| Shooters World Precision | <<locked>> | 88% | 47,848 psi | 87% | 3402 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 47,007 psi | 85% | 3438 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 49,400 psi | 89% | 3442 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 48,095 psi | 87% | 3327 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 48,370 psi | 88% | 3320 fps | 100% |
| Somchem S335 | <<locked>> | 84% | 47,514 psi | 86% | 3320 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,269 psi | 87% | 3396 fps | 97.6% |
| Somchem S355 | <<locked>> | 92% | 49,269 psi | 89% | 3448 fps | 98.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,833 psi | 85% | 3491 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 84% | 48,269 psi | 87% | 3323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 49,269 psi | 89% | 3409 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 47,558 psi | 86% | 3360 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 92% | 47,442 psi | 86% | 3366 fps | 99% |
| Vihtavuori N160 | <<locked>> | 96% | 48,051 psi | 87% | 3425 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 82% | 47,036 psi | 85% | 3369 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 88% | 48,950 psi | 89% | 3399 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 49,066 psi | 89% | 3409 fps | 98.6% |
| Winchester 748 | <<locked>> | 82% | 46,398 psi | 84% | 3412 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 86% | 49,052 psi | 89% | 3445 fps | 98.4% |
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% | 45,455 psi | 82% | 3294 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,014 psi | 69% | 3166 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 44,947 psi | 81% | 3346 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 35,882 psi | 65% | 3140 fps | 98.3% |
| Accurate 4350 | <<locked>> | 96% | 46,006 psi | 83% | 3425 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 41,872 psi | 76% | 3284 fps | 96% |
| ADI AR 2208 | <<locked>> | 86% | 43,076 psi | 78% | 3287 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,932 psi | 80% | 3310 fps | 97.9% |
| Alliant AR-Comp | <<locked>> | 80% | 43,468 psi | 79% | 3323 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 43,613 psi | 79% | 3428 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 37,333 psi | 68% | 3179 fps | 95.6% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,844 psi | 78% | 3320 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 96% | 45,237 psi | 82% | 3435 fps | 95.8% |
| Alliant Reloder-17 | 45.3 gr | 88% | 39,827 psi | 72% | 3323 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 44,019 psi | 80% | 3337 fps | 95.4% |
| Bofors RP3 | <<locked>> | 82% | 36,970 psi | 67% | 3176 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,803 psi | 83% | 3310 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,540 psi | 77% | 3314 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 88% | 46,485 psi | 84% | 3386 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 42,250 psi | 76% | 3301 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 38,899 psi | 70% | 3228 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,101 psi | 69% | 3238 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,759 psi | 47% | 2044 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,393 psi | 73% | 3235 fps | 96.1% |
| IMR 3031 | <<locked>> | 80% | 41,191 psi | 75% | 3310 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 42,322 psi | 77% | 3264 fps | 95.7% |
| IMR 4831 | <<locked>> | 96% | 43,976 psi | 80% | 3360 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 38,595 psi | 70% | 3228 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 43,932 psi | 80% | 3310 fps | 97.9% |
| Lovex D073.6 | <<locked>> | 80% | 40,799 psi | 74% | 3261 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 42,090 psi | 76% | 3222 fps | 96.2% |
| Lovex S062 | <<locked>> | 80% | 37,086 psi | 67% | 3140 fps | 96% |
| Norma 201 | <<locked>> | 80% | 40,915 psi | 74% | 3232 fps | 97.2% |
| Norma 202 | <<locked>> | 80% | 41,046 psi | 74% | 3251 fps | 99.1% |
| Norma 203B | 40.3 gr | 82% | 39,697 psi | 72% | 3241 fps | 95.3% |
| Norma URP | <<locked>> | 96% | 45,759 psi | 83% | 3422 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 82% | 39,334 psi | 71% | 3248 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,439 psi | 79% | 3320 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,121 psi | 47% | 2093 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 42,192 psi | 76% | 3379 fps | 95.4% |
| ReloadSwiss RS 60 | 41.2 gr | 80% | 32,271 psi | 58% | 3107 fps | 95% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 46,035 psi | 83% | 3445 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 44,701 psi | 81% | 3310 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 39,030 psi | 71% | 3176 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 84% | 37,086 psi | 67% | 3169 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,799 psi | 74% | 3261 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 37,086 psi | 67% | 3140 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 41,089 psi | 74% | 3297 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,567 psi | 73% | 3241 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,206 psi | 76% | 3199 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,940 psi | 63% | 3022 fps | 98.7% |
| Somchem S335 | <<locked>> | 80% | 41,945 psi | 76% | 3202 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 41,945 psi | 76% | 3255 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 37,884 psi | 69% | 3179 fps | 95.3% |
| Somchem S365 | <<locked>> | 92% | 35,737 psi | 65% | 3209 fps | 96% |
| Vihtavuori N133 | <<locked>> | 80% | 42,424 psi | 77% | 3205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,927 psi | 69% | 3169 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 38,812 psi | 70% | 3166 fps | 99% |
| Vihtavuori N150 | <<locked>> | 82% | 33,808 psi | 61% | 3038 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 94% | 44,860 psi | 81% | 3356 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 43,932 psi | 80% | 3301 fps | 98% |
| Vihtavuori N540 | <<locked>> | 80% | 37,565 psi | 68% | 3143 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 37,333 psi | 68% | 3130 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 43,323 psi | 78% | 3343 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,798 psi | 72% | 3235 fps | 96.1% |
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 65 powders for .243 Ackley Improved loaded with the .243 | 66gr | SUS-TAC HPT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,570 fps; across all powders the maximum-charge window runs from 2,277 fps to 3,570 fps. Hodgdon Hybrid 100V gives the best case fill at 100 %, and 65 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 63–90 %, leaving at least 10 % headroom. The 66.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon Hybrid 100V, Hodgdon TrailBoss, ReloadSwiss RS 14 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 60, Alliant Reloder-17, Norma 203B rank at the top here: for .243 Ackley Improved with the .243 | 66gr | 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.