Load Specifications
Load data in caliber 7 x 64 Brenneke with .284 | 183gr | Sierra MatchKing bullet and 98 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% | 53,954 psi | 90% | 2398 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 52,199 psi | 87% | 2415 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,138 psi | 80% | 2448 fps | 99.2% |
| Accurate 4064 | <<locked>> | 86% | 54,389 psi | 90% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,346 psi | 90% | 2543 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 53,635 psi | 89% | 2470 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 51,750 psi | 86% | 2434 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 51,808 psi | 86% | 2526 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 49,588 psi | 82% | 2516 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,606 psi | 89% | 2585 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 51,996 psi | 86% | 2454 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 52,214 psi | 87% | 2470 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 51,895 psi | 86% | 2546 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,779 psi | 88% | 2569 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,082 psi | 85% | 2520 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,950 psi | 80% | 2520 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,194 psi | 75% | 2467 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,668 psi | 66% | 2395 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,184 psi | 85% | 2631 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,490 psi | 89% | 2490 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 44,251 psi | 74% | 2454 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 52,330 psi | 87% | 2464 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,950 psi | 80% | 2520 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 52,199 psi | 87% | 2451 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 53,069 psi | 88% | 2484 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 53,258 psi | 88% | 2543 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 53,432 psi | 89% | 2503 fps | 98.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,098 psi | 88% | 2523 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 52,040 psi | 86% | 2507 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 54,201 psi | 90% | 2477 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 51,750 psi | 86% | 2477 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,012 psi | 90% | 2510 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,808 psi | 88% | 2572 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 60% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 51,982 psi | 86% | 2438 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 51,039 psi | 85% | 2415 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,708 psi | 89% | 2448 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 52,678 psi | 88% | 2480 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,954 psi | 90% | 2477 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 51,416 psi | 85% | 2490 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,592 psi | 89% | 2497 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 51,605 psi | 86% | 2467 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 53,679 psi | 89% | 2444 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,113 psi | 88% | 2405 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,230 psi | 90% | 2451 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,635 psi | 89% | 2474 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 51,459 psi | 85% | 2464 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,914 psi | 66% | 2316 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 52,692 psi | 88% | 2421 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,200 psi | 88% | 2418 fps | 100% |
| Norma 203B | <<locked>> | 84% | 51,517 psi | 86% | 2457 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,287 psi | 89% | 2530 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 50,705 psi | 84% | 2592 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 53,272 psi | 89% | 2530 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 51,996 psi | 86% | 2487 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 52,011 psi | 86% | 2533 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 41,785 psi | 69% | 2395 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,825 psi | 61% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,229 psi | 88% | 2470 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,707 psi | 88% | 2526 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,185 psi | 87% | 2559 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,722 psi | 89% | 2562 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,547 psi | 87% | 2589 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 53,055 psi | 88% | 2418 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 52,562 psi | 87% | 2464 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,650 psi | 89% | 2500 fps | 97.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,490 psi | 89% | 2552 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 52,199 psi | 87% | 2451 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,635 psi | 89% | 2474 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,679 psi | 89% | 2444 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,230 psi | 90% | 2451 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 51,459 psi | 85% | 2464 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,795 psi | 89% | 2513 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 52,054 psi | 86% | 2448 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,780 psi | 89% | 2359 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,099 psi | 90% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,548 psi | 89% | 2431 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,997 psi | 88% | 2549 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 53,330 psi | 89% | 2359 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,649 psi | 87% | 2457 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 52,040 psi | 86% | 2454 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 51,793 psi | 86% | 2530 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,215 psi | 90% | 2536 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 54,201 psi | 90% | 2343 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,403 psi | 89% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,780 psi | 89% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,737 psi | 89% | 2434 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 51,982 psi | 86% | 2477 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,789 psi | 78% | 2415 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 51,808 psi | 86% | 2402 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 51,169 psi | 85% | 2487 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,488 psi | 84% | 2533 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 51,401 psi | 85% | 2582 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 51,503 psi | 86% | 2454 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,258 psi | 88% | 2543 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,770 psi | 68% | 2513 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 52,025 psi | 86% | 2454 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,836 psi | 84% | 2480 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% | 47,529 psi | 79% | 2316 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,948 psi | 76% | 2320 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 32,024 psi | 53% | 2159 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 44,991 psi | 75% | 2323 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,823 psi | 56% | 2205 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 80% | 50,604 psi | 84% | 2428 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,902 psi | 71% | 2300 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 40,335 psi | 67% | 2329 fps | 95% |
| ADI AR 2213 | <<locked>> | 98% | 46,441 psi | 77% | 2464 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,630 psi | 77% | 2484 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,018 psi | 71% | 2320 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,209 psi | 77% | 2382 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,373 psi | 55% | 2211 fps | 97.9% |
| Alliant Reloder-17 | 40.8 gr | 80% | 37,565 psi | 62% | 2323 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 39,740 psi | 66% | 2326 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 39,653 psi | 66% | 2369 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,381 psi | 41% | 2001 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 30,995 psi | 51% | 2195 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 84% | 29,370 psi | 49% | 2198 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,922 psi | 83% | 2441 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 41,452 psi | 69% | 2402 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 43,134 psi | 72% | 2333 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 39,653 psi | 66% | 2369 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 38,261 psi | 64% | 2218 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 43,627 psi | 72% | 2339 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 35,853 psi | 60% | 2244 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 38,928 psi | 65% | 2264 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 98% | 49,661 psi | 83% | 2470 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 48,704 psi | 81% | 2457 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,184 psi | 85% | 2434 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,966 psi | 51% | 2123 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,384 psi | 79% | 2421 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 37,347 psi | 62% | 2303 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 45% | 1342 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,733 psi | 81% | 2388 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,092 psi | 75% | 2326 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,326 psi | 79% | 2352 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 36,332 psi | 60% | 2201 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,798 psi | 66% | 2247 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 32,648 psi | 54% | 2165 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 47,384 psi | 79% | 2408 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 48,733 psi | 81% | 2421 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 50,198 psi | 83% | 2402 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,835 psi | 83% | 2362 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,281 psi | 75% | 2326 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,260 psi | 62% | 2201 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 35,433 psi | 59% | 2185 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 31,140 psi | 52% | 2139 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,400 psi | 82% | 2379 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,864 psi | 83% | 2375 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,585 psi | 76% | 2372 fps | 100% |
| Norma 204 | <<locked>> | 86% | 40,625 psi | 67% | 2323 fps | 95% |
| Norma MRP | <<locked>> | 90% | 36,201 psi | 60% | 2326 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 33,765 psi | 56% | 2198 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 45,339 psi | 75% | 2388 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 32,779 psi | 54% | 2188 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 38,754 psi | 64% | 2336 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 45% | 1375 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,700 psi | 73% | 2323 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,226 psi | 82% | 2480 fps | 100% |
| ReloadSwiss RS 60 | 40.8 gr | 80% | 39,972 psi | 66% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,315 psi | 55% | 2218 fps | 97.4% |
| ReloadSwiss RS 70 | 41.4 gr | 80% | 32,909 psi | 55% | 2221 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 80% | 47,224 psi | 78% | 2339 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,509 psi | 67% | 2283 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 44,643 psi | 74% | 2362 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 41,307 psi | 69% | 2359 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 38,261 psi | 64% | 2218 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,260 psi | 62% | 2201 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,198 psi | 83% | 2402 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,281 psi | 75% | 2326 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,433 psi | 59% | 2185 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,481 psi | 69% | 2329 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,834 psi | 81% | 2402 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,647 psi | 84% | 2320 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,569 psi | 71% | 2208 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,376 psi | 60% | 2152 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 40,915 psi | 68% | 2356 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 50,082 psi | 83% | 2320 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,118 psi | 68% | 2283 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 48,501 psi | 81% | 2402 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 30,516 psi | 51% | 2169 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 36,767 psi | 61% | 2247 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,140 psi | 85% | 2306 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,297 psi | 79% | 2306 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,239 psi | 78% | 2316 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,088 psi | 65% | 2221 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,302 psi | 59% | 2201 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 38,638 psi | 64% | 2277 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 45,629 psi | 76% | 2316 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,650 psi | 58% | 2201 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 26,339 psi | 44% | 2067 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 48,153 psi | 80% | 2530 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,490 psi | 57% | 2178 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 35,853 psi | 60% | 2244 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,294 psi | 40% | 2070 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,776 psi | 81% | 2408 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 41,408 psi | 69% | 2329 fps | 95.4% |
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 108 powders for 7 x 64 Brenneke loaded with the .284 | 183gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,631 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,631 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 183.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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 7 x 64 Brenneke with the .284 | 183gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.