Load Specifications
Load data in caliber .260 Rem. with .263 | 140gr | Prvi Partizan PSP 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-16 and Hodgdon Superformance.
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% | 52,141 psi | 87% | 2556 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,766 psi | 89% | 2608 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,963 psi | 76% | 2582 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 52,098 psi | 87% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 51,808 psi | 86% | 2690 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 52,025 psi | 86% | 2628 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,982 psi | 88% | 2631 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,229 psi | 88% | 2720 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,230 psi | 90% | 2625 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,401 psi | 85% | 2740 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,258 psi | 88% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,838 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,040 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,969 psi | 90% | 2772 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,417 psi | 87% | 2713 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,137 psi | 77% | 2654 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,294 psi | 72% | 2605 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,029 psi | 63% | 2513 fps | 97% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,849 psi | 81% | 2776 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 51,677 psi | 86% | 2644 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 53,969 psi | 90% | 2671 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,137 psi | 77% | 2654 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 53,824 psi | 89% | 2648 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,838 psi | 89% | 2657 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,140 psi | 85% | 2631 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 54,447 psi | 90% | 2740 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 51,619 psi | 86% | 2651 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 52,547 psi | 87% | 2638 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,040 psi | 88% | 2674 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,924 psi | 86% | 2667 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 50,995 psi | 85% | 2720 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 60% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,330 psi | 89% | 2635 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 52,562 psi | 87% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,344 psi | 87% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,953 psi | 86% | 2595 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 54,230 psi | 90% | 2677 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,359 psi | 87% | 2628 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 52,359 psi | 87% | 2680 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 51,779 psi | 86% | 2651 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,230 psi | 90% | 2625 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 51,808 psi | 86% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 51,416 psi | 85% | 2559 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,446 psi | 87% | 2608 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 51,750 psi | 86% | 2618 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 52,939 psi | 88% | 2661 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,276 psi | 64% | 2444 fps | 96.5% |
| Norma 201 | <<locked>> | 84% | 54,215 psi | 90% | 2625 fps | 100% |
| Norma 202 | <<locked>> | 82% | 51,401 psi | 85% | 2575 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,084 psi | 88% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 94% | 51,198 psi | 85% | 2671 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 48,486 psi | 81% | 2730 fps | 98% |
| Norma URP | <<locked>> | 96% | 54,244 psi | 90% | 2726 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 53,534 psi | 89% | 2687 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,113 psi | 88% | 2726 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 54,041 psi | 90% | 2648 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,128 psi | 90% | 2664 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 61% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,285 psi | 85% | 2615 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,302 psi | 90% | 2736 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,751 psi | 89% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 51,488 psi | 86% | 2710 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,317 psi | 90% | 2792 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 51,343 psi | 85% | 2575 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,824 psi | 89% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 51,866 psi | 86% | 2644 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,111 psi | 85% | 2694 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 53,824 psi | 89% | 2648 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 51,750 psi | 86% | 2618 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 51,808 psi | 86% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,446 psi | 87% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,939 psi | 88% | 2661 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,851 psi | 86% | 2671 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,678 psi | 88% | 2628 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,708 psi | 89% | 2651 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,011 psi | 86% | 2513 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,359 psi | 87% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 51,648 psi | 86% | 2575 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,633 psi | 84% | 2687 fps | 97.1% |
| Somchem S335 | <<locked>> | 82% | 51,648 psi | 86% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,605 psi | 87% | 2621 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,172 psi | 90% | 2661 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,939 psi | 88% | 2730 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,156 psi | 87% | 2680 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 52,417 psi | 87% | 2500 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,271 psi | 85% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 51,967 psi | 86% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 51,938 psi | 86% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,214 psi | 88% | 2674 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,860 psi | 75% | 2546 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 86% | 53,316 psi | 89% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,243 psi | 87% | 2680 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,153 psi | 80% | 2677 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,026 psi | 88% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 51,010 psi | 85% | 2687 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,812 psi | 64% | 2635 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,577 psi | 89% | 2657 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 48,762 psi | 81% | 2615 fps | 96.3% |
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% | 45,658 psi | 76% | 2464 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,179 psi | 73% | 2451 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 34,911 psi | 58% | 2375 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 43,207 psi | 72% | 2467 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,169 psi | 53% | 2323 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 48,834 psi | 81% | 2579 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,365 psi | 69% | 2438 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 44,077 psi | 73% | 2562 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,879 psi | 85% | 2579 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,744 psi | 74% | 2628 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,466 psi | 69% | 2464 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,469 psi | 74% | 2526 fps | 99.6% |
| Alliant Reloder-16 | 34.7 gr | 80% | 32,285 psi | 54% | 2336 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,868 psi | 60% | 2451 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 43,308 psi | 72% | 2556 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 98% | 43,207 psi | 72% | 2602 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,527 psi | 44% | 2205 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,794 psi | 56% | 2411 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,140 psi | 53% | 2418 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,182 psi | 80% | 2592 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 41,466 psi | 69% | 2474 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 43,207 psi | 72% | 2602 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 39,378 psi | 65% | 2395 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,111 psi | 83% | 2605 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,134 psi | 70% | 2480 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 39,030 psi | 65% | 2470 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 42,656 psi | 71% | 2497 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,313 psi | 82% | 2589 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,617 psi | 49% | 2238 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,600 psi | 76% | 2569 fps | 100% |
| Hodgdon Superformance | 42.4 gr | 86% | 41,118 psi | 68% | 2539 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 45% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,268 psi | 79% | 2543 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,501 psi | 82% | 2572 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,439 psi | 72% | 2467 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,847 psi | 76% | 2493 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 39,523 psi | 66% | 2421 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,522 psi | 64% | 2379 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 31,299 psi | 52% | 2287 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 45,542 psi | 76% | 2552 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 50,879 psi | 85% | 2579 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,544 psi | 81% | 2559 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,240 psi | 80% | 2510 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 43,613 psi | 72% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,897 psi | 60% | 2329 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 38,812 psi | 64% | 2411 fps | 95.8% |
| Lovex S071 | <<locked>> | 98% | 35,723 psi | 59% | 2392 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 47,747 psi | 79% | 2530 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,196 psi | 80% | 2530 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,816 psi | 73% | 2513 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 44,585 psi | 74% | 2556 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 39,566 psi | 66% | 2556 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 32,372 psi | 54% | 2323 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,526 psi | 72% | 2530 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 35,955 psi | 60% | 2411 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 50,836 psi | 84% | 2598 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,473 psi | 84% | 2612 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 45% | 1483 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,177 psi | 70% | 2461 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,152 psi | 78% | 2625 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,159 psi | 63% | 2507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,821 psi | 53% | 2336 fps | 95.8% |
| ReloadSwiss RS 70 | 38.9 gr | 82% | 33,881 psi | 56% | 2395 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 45,484 psi | 76% | 2484 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,957 psi | 65% | 2421 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 48,602 psi | 81% | 2592 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 45,005 psi | 75% | 2592 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 39,378 psi | 65% | 2395 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,897 psi | 60% | 2329 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,544 psi | 81% | 2559 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,613 psi | 72% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 38,812 psi | 64% | 2411 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,755 psi | 66% | 2464 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,414 psi | 82% | 2575 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,036 psi | 78% | 2549 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,052 psi | 81% | 2474 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,118 psi | 68% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,608 psi | 62% | 2329 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,585 psi | 74% | 2585 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 48,501 psi | 81% | 2470 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,052 psi | 81% | 2569 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,566 psi | 66% | 2421 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,066 psi | 48% | 2280 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 40,190 psi | 67% | 2474 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 49,472 psi | 82% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,498 psi | 76% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,687 psi | 76% | 2470 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,681 psi | 63% | 2359 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,750 psi | 56% | 2326 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 42,018 psi | 70% | 2497 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 44,164 psi | 73% | 2464 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,315 psi | 55% | 2326 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 28,471 psi | 47% | 2274 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,257 psi | 55% | 2300 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 39,320 psi | 65% | 2477 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,411 psi | 44% | 2277 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,862 psi | 78% | 2556 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 45,571 psi | 76% | 2562 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 112 powders for .260 Rem. loaded with the .263 | 140gr | Prvi Partizan PSP. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,792 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,792 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.263" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for .260 Rem. with the .263 | 140gr | Prvi Partizan PSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.