Load Specifications
Load data in caliber .33 Nosler with .338 | 250gr | Barnes X S bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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>> | 82% | 58,624 psi | 90% | 2497 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,914 psi | 89% | 2556 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,159 psi | 86% | 2612 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 58,595 psi | 90% | 2546 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,436 psi | 90% | 2651 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,276 psi | 88% | 2736 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 86% | 56,985 psi | 88% | 2566 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 58,218 psi | 90% | 2684 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,854 psi | 86% | 2680 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,231 psi | 87% | 2684 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,073 psi | 89% | 2589 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,421 psi | 90% | 2612 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 58,117 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,985 psi | 86% | 2667 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,522 psi | 88% | 2674 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,940 psi | 85% | 2684 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,199 psi | 80% | 2621 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,759 psi | 70% | 2566 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,651 psi | 86% | 2753 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,676 psi | 78% | 2618 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 56,086 psi | 86% | 2569 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,940 psi | 85% | 2684 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 58,262 psi | 90% | 2598 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,295 psi | 70% | 2497 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,869 psi | 86% | 2579 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,304 psi | 87% | 2644 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 55,985 psi | 86% | 2605 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 98% | 56,130 psi | 86% | 2631 fps | 97.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 58,552 psi | 90% | 2664 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 58,740 psi | 90% | 2618 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,855 psi | 87% | 2605 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,802 psi | 69% | 2595 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 90% | 56,173 psi | 86% | 2684 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 57% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,406 psi | 88% | 2569 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,521 psi | 87% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,622 psi | 86% | 2536 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 55,448 psi | 85% | 2582 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,101 psi | 86% | 2572 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 58,407 psi | 90% | 2638 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,405 psi | 87% | 2589 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,624 psi | 89% | 2618 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2657 fps | 97.3% |
| Lovex S060 | <<locked>> | 82% | 57,885 psi | 89% | 2530 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,334 psi | 88% | 2549 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,710 psi | 87% | 2572 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 57,943 psi | 89% | 2612 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,500 psi | 73% | 2487 fps | 99.3% |
| Norma 203B | <<locked>> | 84% | 57,783 psi | 89% | 2598 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,028 psi | 86% | 2628 fps | 98.6% |
| Norma MRPᴾ | <<locked>> | 100% | 58,363 psi | 90% | 2762 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 56,492 psi | 87% | 2631 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,276 psi | 90% | 2625 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,766 psi | 83% | 2674 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 94% | 58,523 psi | 90% | 2680 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2569 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 58% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,622 psi | 86% | 2562 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,448 psi | 85% | 2657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,696 psi | 89% | 2671 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,724 psi | 86% | 2694 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,730 psi | 69% | 2595 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 56,115 psi | 86% | 2513 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,173 psi | 86% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,521 psi | 87% | 2608 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 57,188 psi | 88% | 2664 fps | 99% |
| Rottweil R 907 | <<locked>> | 90% | 58,262 psi | 90% | 2598 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,710 psi | 87% | 2572 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,334 psi | 88% | 2549 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,943 psi | 89% | 2612 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,913 psi | 88% | 2612 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,870 psi | 89% | 2582 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,405 psi | 87% | 2444 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,304 psi | 87% | 2530 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,681 psi | 87% | 2661 fps | 99% |
| Somchem S355 | <<locked>> | 86% | 55,883 psi | 86% | 2556 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 58,363 psi | 90% | 2605 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 55,956 psi | 86% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,899 psi | 89% | 2644 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,405 psi | 87% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,057 psi | 86% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,681 psi | 87% | 2530 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 58,436 psi | 90% | 2618 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2569 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 84% | 57,580 psi | 89% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,667 psi | 89% | 2631 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,784 psi | 90% | 2694 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 58,610 psi | 90% | 2753 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,384 psi | 73% | 2572 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,856 psi | 89% | 2592 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,463 psi | 87% | 2648 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,427 psi | 73% | 2687 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,059 psi | 89% | 2592 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,740 psi | 89% | 2638 fps | 98.9% |
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% | 55,201 psi | 85% | 2457 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,227 psi | 79% | 2461 fps | 98.6% |
| Accurate 3100 | <<locked>> | 82% | 32,227 psi | 50% | 2195 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 52,185 psi | 80% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,103 psi | 62% | 2369 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 96% | 50,169 psi | 77% | 2628 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 47,747 psi | 73% | 2434 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,422 psi | 62% | 2385 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 46,383 psi | 71% | 2526 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,562 psi | 81% | 2631 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,689 psi | 75% | 2461 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,866 psi | 80% | 2520 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,261 psi | 59% | 2365 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,076 psi | 66% | 2474 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,292 psi | 62% | 2388 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,480 psi | 62% | 2434 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,037 psi | 45% | 2172 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,589 psi | 47% | 2224 fps | 95.2% |
| Alliant Reloder-26 | 64.2 gr | 80% | 30,864 psi | 47% | 2277 fps | 96.5% |
| Bofors RP15 | <<locked>> | 92% | 39,972 psi | 61% | 2425 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,472 psi | 76% | 2477 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,480 psi | 62% | 2434 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,497 psi | 67% | 2365 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 42,612 psi | 66% | 2448 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,545 psi | 76% | 2487 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,162 psi | 63% | 2395 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,888 psi | 68% | 2408 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 94% | 49,559 psi | 76% | 2530 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,544 psi | 75% | 2516 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,013 psi | 55% | 2270 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,519 psi | 82% | 2562 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,856 psi | 61% | 2487 fps | 95.8% |
| Hodgdon Superformance | 66.2 gr | 80% | 40,103 psi | 62% | 2411 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1401 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,070 psi | 83% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,256 psi | 77% | 2461 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,402 psi | 81% | 2490 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 39,015 psi | 60% | 2303 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,527 psi | 69% | 2388 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 38,276 psi | 59% | 2320 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 53,113 psi | 82% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,428 psi | 75% | 2477 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,367 psi | 68% | 2500 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 54,781 psi | 84% | 2490 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 51,082 psi | 79% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,583 psi | 66% | 2349 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 40,799 psi | 63% | 2336 fps | 97.5% |
| Lovex S071 | <<locked>> | 86% | 31,589 psi | 49% | 2182 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 51,242 psi | 79% | 2510 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,814 psi | 63% | 2375 fps | 95.4% |
| Norma MRP | <<locked>> | 84% | 35,056 psi | 54% | 2346 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 39,218 psi | 60% | 2352 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,285 psi | 79% | 2530 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,208 psi | 68% | 2510 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 37,942 psi | 58% | 2343 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 37,246 psi | 57% | 2356 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1437 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,255 psi | 76% | 2470 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,556 psi | 70% | 2516 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,276 psi | 60% | 2379 fps | 98.9% |
| ReloadSwiss RS 70 | 63.6 gr | 80% | 37,942 psi | 58% | 2385 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,970 psi | 57% | 2421 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 53,084 psi | 82% | 2474 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,746 psi | 72% | 2431 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,498 psi | 68% | 2415 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 86% | 39,436 psi | 61% | 2372 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 43,497 psi | 67% | 2365 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,583 psi | 66% | 2349 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 51,082 psi | 79% | 2464 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,799 psi | 63% | 2336 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,137 psi | 73% | 2474 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,346 psi | 84% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,268 psi | 73% | 2326 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,640 psi | 64% | 2300 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,102 psi | 60% | 2369 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 46,862 psi | 72% | 2425 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,312 psi | 74% | 2457 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,013 psi | 55% | 2323 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,708 psi | 55% | 2267 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 53,011 psi | 82% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,779 psi | 81% | 2444 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,599 psi | 69% | 2359 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,582 psi | 62% | 2349 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 37,144 psi | 57% | 2293 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 51,213 psi | 79% | 2444 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,205 psi | 62% | 2356 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 32,082 psi | 49% | 2241 fps | 98% |
| Vihtavuori N560 | <<locked>> | 92% | 45,339 psi | 70% | 2539 fps | 95% |
| Vihtavuori N565 | <<locked>> | 98% | 44,512 psi | 68% | 2523 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,392 psi | 61% | 2320 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,379 psi | 64% | 2402 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,005 psi | 40% | 2169 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,491 psi | 84% | 2543 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,334 psi | 61% | 2343 fps | 95% |
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 101 powders for .33 Nosler loaded with the .338 | 250gr | Barnes X S. Norma MRP delivers the highest muzzle velocity at 2,762 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,762 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.0 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. Alliant Reloder-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .33 Nosler with the .338 | 250gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.