Load Specifications
Load data in caliber .264 RLB TM with .264 | 139gr | Brenneke TOG bullet and 96 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 52 and Hodgdon LEVERevolution.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 50,502 psi | 86% | 2385 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 51,430 psi | 88% | 2467 fps | 98.7% |
| Accurate 2230 | <<locked>> | 82% | 51,880 psi | 88% | 2477 fps | 99% |
| Accurate 2460 | <<locked>> | 88% | 52,533 psi | 89% | 2454 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 49,850 psi | 85% | 2434 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 49,705 psi | 85% | 2457 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 52,663 psi | 90% | 2510 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 38,754 psi | 66% | 2369 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 84% | 51,924 psi | 88% | 2346 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 52,373 psi | 89% | 2365 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 52,953 psi | 90% | 2507 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 53,142 psi | 90% | 2362 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 50,386 psi | 86% | 2454 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 84% | 50,937 psi | 87% | 2444 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 52,649 psi | 90% | 2474 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 50,923 psi | 87% | 2451 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 50,125 psi | 85% | 2513 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 52,069 psi | 89% | 2595 fps | 98.8% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 52,199 psi | 89% | 2516 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 50,807 psi | 86% | 2395 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 50,169 psi | 85% | 2490 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 40,582 psi | 69% | 2379 fps | 96.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 46,238 psi | 79% | 2513 fps | 99% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 50,575 psi | 86% | 2349 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 52,417 psi | 89% | 2520 fps | 98.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 52,011 psi | 89% | 2526 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 51,677 psi | 88% | 2415 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 50,531 psi | 86% | 2497 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 52,083 psi | 89% | 2572 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 88% | 53,113 psi | 90% | 2474 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 50,560 psi | 86% | 2454 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 50,647 psi | 86% | 2487 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 92% | 50,198 psi | 85% | 2474 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,782 psi | 63% | 2280 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 51,271 psi | 87% | 2543 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,040 psi | 58% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 51,605 psi | 88% | 2477 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 51,779 psi | 88% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 53,098 psi | 90% | 2480 fps | 99.1% |
| IMR 4198 | <<locked>> | 86% | 51,822 psi | 88% | 2362 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 51,416 psi | 88% | 2523 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 92% | 52,649 psi | 90% | 2474 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 52,417 psi | 89% | 2457 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 52,359 psi | 89% | 2461 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 50,879 psi | 87% | 2484 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 50,604 psi | 86% | 2405 fps | 99.1% |
| Lovex S062 | <<locked>> | 98% | 52,315 psi | 89% | 2484 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 45,063 psi | 77% | 2375 fps | 95.7% |
| Norma 200 | <<locked>> | 82% | 51,256 psi | 87% | 2375 fps | 100% |
| Norma 201 | <<locked>> | 94% | 51,329 psi | 87% | 2457 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 51,706 psi | 88% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 98% | 52,388 psi | 89% | 2526 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 40,132 psi | 68% | 2372 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 98% | 52,997 psi | 90% | 2549 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 49,705 psi | 85% | 2434 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 51,779 psi | 88% | 2500 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 50,937 psi | 87% | 2431 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,258 psi | 58% | 1493 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 52,562 psi | 89% | 2464 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 51,909 psi | 88% | 2474 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 52,489 psi | 89% | 2589 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 49,443 psi | 84% | 2575 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 53,113 psi | 90% | 2451 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 51,648 psi | 88% | 2451 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,675 psi | 83% | 2470 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 52,417 psi | 89% | 2457 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 45,063 psi | 77% | 2375 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 94% | 50,879 psi | 87% | 2484 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 52,315 psi | 89% | 2484 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 52,257 psi | 89% | 2431 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 53,084 psi | 90% | 2133 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 51,750 psi | 88% | 2461 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 50,705 psi | 86% | 2526 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 51,953 psi | 88% | 2411 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 50,604 psi | 86% | 2454 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 51,068 psi | 87% | 2480 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 50,937 psi | 87% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 53,011 psi | 90% | 2405 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 50,082 psi | 85% | 2461 fps | 99.8% |
| Somchem S335 | <<locked>> | 94% | 52,736 psi | 90% | 2411 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 50,009 psi | 85% | 2451 fps | 99% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,414 psi | 84% | 2470 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,404 psi | 60% | 2320 fps | 97.9% |
| Vihtavuori N120 | <<locked>> | 82% | 53,011 psi | 90% | 2316 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 51,300 psi | 87% | 2356 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 50,676 psi | 86% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 50,473 psi | 86% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 52,373 psi | 89% | 2448 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 48,008 psi | 82% | 2418 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 42,293 psi | 72% | 2372 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 92% | 53,127 psi | 90% | 2474 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 50,183 psi | 85% | 2444 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 41,205 psi | 70% | 2379 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,685 psi | 74% | 2362 fps | 98.4% |
| Winchester 748 | <<locked>> | 92% | 51,532 psi | 88% | 2513 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 50,285 psi | 86% | 2487 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 37,217 psi | 63% | 2192 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 48,225 psi | 82% | 2421 fps | 98.2% |
| Accurate 2230 | <<locked>> | 80% | 48,138 psi | 82% | 2425 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 40,132 psi | 68% | 2277 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 29,878 psi | 51% | 2116 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 35,447 psi | 60% | 2231 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 28,297 psi | 48% | 2100 fps | 98.2% |
| Accurate 4350 | <<locked>> | 98% | 36,260 psi | 62% | 2320 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 45,977 psi | 78% | 2267 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 46,296 psi | 79% | 2283 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 34,258 psi | 58% | 2192 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 80% | 49,864 psi | 85% | 2323 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 35,360 psi | 60% | 2198 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 44,846 psi | 76% | 2362 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 36,172 psi | 62% | 2208 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 80% | 34,534 psi | 59% | 2215 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 41,394 psi | 70% | 2372 fps | 98.4% |
| Alliant Power Pro 2000-MR | 28 gr | 86% | 37,275 psi | 63% | 2333 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 29,718 psi | 51% | 2123 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,482 psi | 72% | 2280 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 34,374 psi | 59% | 2218 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 38,218 psi | 65% | 2333 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 33,576 psi | 57% | 2267 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,193 psi | 75% | 2260 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 37,797 psi | 64% | 2283 fps | 95.5% |
| Bofors RP3 | <<locked>> | 82% | 28,848 psi | 49% | 2119 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,319 psi | 65% | 2208 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,765 psi | 57% | 2218 fps | 97.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 37,202 psi | 63% | 2320 fps | 96% |
| Hodgdon H322 | <<locked>> | 80% | 41,191 psi | 70% | 2306 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 41,655 psi | 71% | 2323 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 38,986 psi | 66% | 2300 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 34,403 psi | 59% | 2205 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 32,590 psi | 55% | 2192 fps | 95.2% |
| Hodgdon LEVERevolution | 25.6 gr | 80% | 30,690 psi | 52% | 2165 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,483 psi | 43% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,243 psi | 57% | 2162 fps | 95.9% |
| IMR 3031 | <<locked>> | 80% | 33,054 psi | 56% | 2211 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 34,780 psi | 59% | 2182 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 43,700 psi | 74% | 2254 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 32,982 psi | 56% | 2201 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 36,172 psi | 62% | 2208 fps | 97.6% |
| Lovex D073.4 | <<locked>> | 80% | 48,704 psi | 83% | 2408 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 40,045 psi | 68% | 2280 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 31,908 psi | 54% | 2172 fps | 98.2% |
| Lovex S060 | <<locked>> | 80% | 35,346 psi | 60% | 2146 fps | 96% |
| Lovex S062 | <<locked>> | 80% | 30,037 psi | 51% | 2096 fps | 95.8% |
| Lovex S065 | <<locked>> | 98% | 42,395 psi | 72% | 2333 fps | 95% |
| Norma 200 | <<locked>> | 80% | 48,153 psi | 82% | 2336 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,736 psi | 57% | 2162 fps | 97.1% |
| Norma 202 | <<locked>> | 80% | 33,431 psi | 57% | 2172 fps | 99% |
| Norma 203B | <<locked>> | 84% | 33,707 psi | 57% | 2211 fps | 95.7% |
| Norma URP | <<locked>> | 98% | 37,811 psi | 64% | 2329 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 84% | 33,446 psi | 57% | 2215 fps | 95% |
| Ramshot TAC | <<locked>> | 86% | 43,787 psi | 75% | 2339 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,896 psi | 59% | 2218 fps | 95.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 39,088 psi | 67% | 2244 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,382 psi | 43% | 1332 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,712 psi | 69% | 2287 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 48,834 psi | 83% | 2428 fps | 95.7% |
| ReloadSwiss RS 52 | 26.5 gr | 84% | 35,230 psi | 60% | 2293 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 27,731 psi | 47% | 2126 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 37,289 psi | 63% | 2208 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 31,923 psi | 54% | 2116 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 86% | 30,734 psi | 52% | 2156 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 48,704 psi | 83% | 2408 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 42,395 psi | 72% | 2333 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,908 psi | 54% | 2172 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 30,037 psi | 51% | 2096 fps | 95.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,946 psi | 73% | 2297 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,430 psi | 86% | 2100 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 45,397 psi | 77% | 2372 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 34,693 psi | 59% | 2251 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 43,337 psi | 74% | 2297 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 41,176 psi | 70% | 2306 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 32,808 psi | 56% | 2162 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,607 psi | 61% | 2136 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,921 psi | 49% | 2021 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 38,174 psi | 65% | 2270 fps | 98.4% |
| Somchem S335 | <<locked>> | 80% | 34,954 psi | 60% | 2142 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 33,286 psi | 57% | 2169 fps | 95.2% |
| Somchem S355 | <<locked>> | 84% | 30,400 psi | 52% | 2129 fps | 95% |
| Somchem S365 | <<locked>> | 94% | 29,559 psi | 50% | 2182 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 49,806 psi | 85% | 2280 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 40,437 psi | 69% | 2205 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,534 psi | 60% | 2139 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,618 psi | 52% | 2119 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 31,459 psi | 54% | 2116 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 82% | 26,890 psi | 46% | 2028 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 98% | 39,755 psi | 68% | 2326 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 36,042 psi | 61% | 2205 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 80% | 30,168 psi | 51% | 2106 fps | 98.1% |
| Vihtavuori N550 | <<locked>> | 98% | 38,435 psi | 65% | 2329 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 33,866 psi | 58% | 2178 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 34,432 psi | 59% | 2231 fps | 98.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,720 psi | 54% | 2162 fps | 95.5% |
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 96 powders for .264 RLB TM loaded with the .264 | 139gr | Brenneke TOG. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,595 fps. Accurate 4064 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (405 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.264" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, Alliant Reloder- TS 15.5 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 52, Hodgdon LEVERevolution rank at the top here: for .264 RLB TM with the .264 | 139gr | Brenneke TOG 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.