Load Specifications
Load data in caliber 7.5 x 55 Swiss with .31 | 200gr | Lapua D166 bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 48,443 psi | 88% | 2487 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,224 psi | 86% | 2490 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,785 psi | 76% | 2520 fps | 98.7% |
| Accurate 4064 | <<locked>> | 86% | 48,501 psi | 88% | 2533 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 47,543 psi | 86% | 2621 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 48,878 psi | 89% | 2566 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 49,864 psi | 90% | 2569 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,690 psi | 90% | 2657 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 47,761 psi | 87% | 2674 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,792 psi | 90% | 2589 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 47,050 psi | 85% | 2559 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 49,139 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,792 psi | 90% | 2703 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,660 psi | 88% | 2648 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 42,279 psi | 77% | 2592 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,842 psi | 72% | 2546 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 35,288 psi | 64% | 2467 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,411 psi | 81% | 2707 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 48,196 psi | 87% | 2579 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 49,850 psi | 90% | 2598 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 42,279 psi | 77% | 2592 fps | 96.6% |
| Bofors RP7 | <<locked>> | 90% | 47,253 psi | 86% | 2533 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 47,776 psi | 87% | 2569 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 47,137 psi | 86% | 2621 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 48,022 psi | 87% | 2585 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 49,327 psi | 90% | 2572 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,689 psi | 88% | 2602 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 48,312 psi | 88% | 2602 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 46,949 psi | 85% | 2651 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,578 psi | 65% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 47,152 psi | 86% | 2526 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 49,139 psi | 89% | 2546 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 49,458 psi | 90% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 49,269 psi | 89% | 2533 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 47,355 psi | 86% | 2559 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,950 psi | 89% | 2562 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 48,269 psi | 88% | 2615 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 48,196 psi | 87% | 2585 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 49,603 psi | 90% | 2595 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 48,225 psi | 88% | 2536 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 48,588 psi | 88% | 2493 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 49,052 psi | 89% | 2543 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 48,530 psi | 88% | 2559 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 49,284 psi | 89% | 2595 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 34,693 psi | 63% | 2388 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 47,718 psi | 87% | 2510 fps | 100% |
| Norma 202 | <<locked>> | 82% | 48,269 psi | 88% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 86% | 49,487 psi | 90% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 94% | 47,355 psi | 86% | 2602 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 44,367 psi | 81% | 2664 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 47,210 psi | 86% | 2615 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 49,385 psi | 90% | 2615 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 48,979 psi | 89% | 2661 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 66% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,935 psi | 87% | 2552 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 47,007 psi | 85% | 2615 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,603 psi | 90% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 47,210 psi | 86% | 2644 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 46,775 psi | 85% | 2667 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 48,225 psi | 88% | 2510 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 46,775 psi | 85% | 2546 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 48,196 psi | 87% | 2579 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,239 psi | 86% | 2631 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,253 psi | 86% | 2533 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 48,530 psi | 88% | 2559 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 48,225 psi | 88% | 2536 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 49,052 psi | 89% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 49,284 psi | 89% | 2595 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 48,051 psi | 87% | 2602 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 49,298 psi | 89% | 2562 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 47,268 psi | 86% | 2539 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 49,081 psi | 89% | 2444 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 49,284 psi | 89% | 2451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 48,182 psi | 87% | 2510 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 46,804 psi | 85% | 2625 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 48,588 psi | 88% | 2448 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 49,153 psi | 89% | 2552 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 47,340 psi | 86% | 2546 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 48,080 psi | 87% | 2657 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,732 psi | 87% | 2608 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 49,385 psi | 90% | 2431 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 47,964 psi | 87% | 2470 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 48,457 psi | 88% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 48,457 psi | 88% | 2526 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 49,327 psi | 90% | 2605 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 41,437 psi | 75% | 2487 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 84% | 46,862 psi | 85% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 48,472 psi | 88% | 2618 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,772 psi | 79% | 2612 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,313 psi | 89% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 47,398 psi | 86% | 2625 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,708 psi | 65% | 2582 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 46,731 psi | 85% | 2543 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 45,092 psi | 82% | 2549 fps | 96.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 42,453 psi | 77% | 2405 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,727 psi | 76% | 2398 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 29,762 psi | 54% | 2277 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 40,176 psi | 73% | 2408 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,428 psi | 53% | 2277 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,759 psi | 83% | 2516 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 39,015 psi | 71% | 2388 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 94% | 40,973 psi | 74% | 2503 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,785 psi | 76% | 2569 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,653 psi | 70% | 2408 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,481 psi | 75% | 2467 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,066 psi | 55% | 2290 fps | 97.3% |
| Alliant Reloder-17 | 44.2 gr | 80% | 33,402 psi | 61% | 2405 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 94% | 40,306 psi | 73% | 2500 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 37,289 psi | 68% | 2490 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 23,119 psi | 42% | 2119 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 29,399 psi | 53% | 2313 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 86% | 27,615 psi | 50% | 2320 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,947 psi | 82% | 2526 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 38,450 psi | 70% | 2418 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 37,289 psi | 68% | 2490 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 34,635 psi | 63% | 2297 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 39,073 psi | 71% | 2421 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 33,968 psi | 62% | 2372 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 37,159 psi | 67% | 2385 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,224 psi | 84% | 2523 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,543 psi | 50% | 2195 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,264 psi | 77% | 2510 fps | 100% |
| Hodgdon Superformance | 49 gr | 84% | 35,534 psi | 64% | 2428 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 48% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,396 psi | 81% | 2484 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 46,137 psi | 84% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,988 psi | 74% | 2415 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,265 psi | 79% | 2434 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 34,809 psi | 63% | 2326 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 36,085 psi | 65% | 2326 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 28,674 psi | 52% | 2241 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 42,511 psi | 77% | 2493 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 46,499 psi | 84% | 2546 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 45,121 psi | 82% | 2490 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,818 psi | 83% | 2451 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 40,988 psi | 74% | 2415 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 33,649 psi | 61% | 2283 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 31,923 psi | 58% | 2267 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 30,530 psi | 55% | 2297 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,889 psi | 81% | 2467 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,150 psi | 82% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,857 psi | 74% | 2457 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 38,783 psi | 70% | 2448 fps | 95% |
| Norma MRP | <<locked>> | 92% | 34,127 psi | 62% | 2451 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 30,066 psi | 55% | 2283 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,480 psi | 73% | 2474 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 31,314 psi | 57% | 2316 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,050 psi | 49% | 1440 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,508 psi | 72% | 2405 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,859 psi | 80% | 2566 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,563 psi | 65% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 29,211 psi | 53% | 2290 fps | 96.6% |
| ReloadSwiss RS 70 | 44.9 gr | 80% | 29,515 psi | 54% | 2297 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 42,772 psi | 78% | 2425 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 36,245 psi | 66% | 2369 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 96% | 45,107 psi | 82% | 2530 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 38,798 psi | 70% | 2480 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 34,635 psi | 63% | 2297 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,649 psi | 61% | 2283 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,121 psi | 82% | 2490 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,988 psi | 74% | 2415 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 31,923 psi | 58% | 2267 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,057 psi | 67% | 2418 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,137 psi | 84% | 2513 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,266 psi | 80% | 2490 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,122 psi | 84% | 2405 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,464 psi | 70% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 32,634 psi | 59% | 2231 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 38,479 psi | 70% | 2474 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 45,818 psi | 83% | 2408 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,730 psi | 83% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,941 psi | 67% | 2369 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 26,905 psi | 49% | 2241 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 34,563 psi | 63% | 2369 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 46,499 psi | 84% | 2392 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,322 psi | 77% | 2392 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,975 psi | 78% | 2408 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,230 psi | 64% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 31,256 psi | 57% | 2277 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 36,303 psi | 66% | 2388 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 41,147 psi | 75% | 2405 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 30,705 psi | 56% | 2283 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 24,511 psi | 44% | 2188 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,009 psi | 56% | 2254 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 33,968 psi | 62% | 2372 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 23,061 psi | 42% | 2192 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,787 psi | 79% | 2497 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 39,276 psi | 71% | 2448 fps | 95.2% |
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 7.5 x 55 Swiss loaded with the .31 | 200gr | Lapua D166. Alliant Reloder-26 delivers the highest muzzle velocity at 2,707 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,707 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 (380 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:13.0 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 7.5 x 55 Swiss with the .31 | 200gr | Lapua D166 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.