Load Specifications
Load data in caliber .30 TC with .308 | 200gr | Woodleigh PP SN bullet and 93 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 CFE223.
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 2015 | <<locked>> | 92% | 53,563 psi | 87% | 2306 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 54,810 psi | 89% | 2392 fps | 98.9% |
| Accurate 2230 | <<locked>> | 84% | 55,230 psi | 90% | 2398 fps | 99.2% |
| Accurate 2460 | <<locked>> | 90% | 55,593 psi | 90% | 2369 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 53,316 psi | 86% | 2356 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 53,026 psi | 86% | 2379 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 52,779 psi | 86% | 2388 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 54,926 psi | 89% | 2267 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 55,361 psi | 90% | 2287 fps | 100% |
| ADI AR 2206H | <<locked>> | 96% | 55,767 psi | 90% | 2421 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 52,765 psi | 86% | 2244 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 53,563 psi | 87% | 2375 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 86% | 54,708 psi | 89% | 2372 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 55,376 psi | 90% | 2385 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 54,288 psi | 88% | 2369 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 53,258 psi | 86% | 2431 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 55,492 psi | 90% | 2516 fps | 99.1% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 52,069 psi | 84% | 2392 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 88% | 54,215 psi | 88% | 2316 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 52,997 psi | 86% | 2405 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 46,122 psi | 75% | 2388 fps | 98.8% |
| Alliant Reloder-7 | <<locked>> | 82% | 53,896 psi | 87% | 2260 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 53,664 psi | 87% | 2270 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 55,767 psi | 90% | 2441 fps | 98.9% |
| Bofors RP3ᴾ | <<locked>> | 100% | 52,141 psi | 85% | 2402 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 92% | 54,926 psi | 89% | 2336 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 53,795 psi | 87% | 2415 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 52,098 psi | 85% | 2448 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 88% | 52,968 psi | 86% | 2349 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 53,766 psi | 87% | 2372 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 54,114 psi | 88% | 2411 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 82% | 53,388 psi | 87% | 2264 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 52,881 psi | 86% | 2388 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,608 psi | 59% | 2162 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 54,563 psi | 89% | 2457 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,258 psi | 56% | 1385 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 54,563 psi | 89% | 2392 fps | 99.6% |
| IMR 3031 | <<locked>> | 96% | 54,795 psi | 89% | 2415 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 53,026 psi | 86% | 2359 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 96% | 54,331 psi | 88% | 2339 fps | 95.7% |
| IMR 4198 | <<locked>> | 88% | 54,694 psi | 89% | 2280 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 54,230 psi | 88% | 2434 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 94% | 55,376 psi | 90% | 2385 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 82% | 52,272 psi | 85% | 2336 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 52,127 psi | 85% | 2336 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 54,389 psi | 88% | 2405 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 53,432 psi | 87% | 2323 fps | 99.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 55,506 psi | 90% | 2402 fps | 99.9% |
| Norma 200 | <<locked>> | 84% | 54,041 psi | 88% | 2293 fps | 100% |
| Norma 201 | <<locked>> | 96% | 54,636 psi | 89% | 2375 fps | 99.9% |
| Norma 202 | <<locked>> | 96% | 54,795 psi | 89% | 2382 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 55,405 psi | 90% | 2441 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 98% | 52,504 psi | 85% | 2421 fps | 99.1% |
| Ramshot TAC | <<locked>> | 92% | 52,808 psi | 86% | 2356 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 94% | 54,955 psi | 89% | 2418 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 90% | 53,954 psi | 88% | 2352 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,258 psi | 56% | 1417 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 55,419 psi | 90% | 2375 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 54,940 psi | 89% | 2392 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 52,547 psi | 85% | 2461 fps | 99% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 49,327 psi | 80% | 2444 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 52,678 psi | 85% | 2326 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 54,694 psi | 89% | 2369 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,269 psi | 78% | 2346 fps | 99.2% |
| Shooters World AR Plus | <<locked>> | 82% | 52,272 psi | 85% | 2336 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 96% | 54,389 psi | 88% | 2405 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 55,506 psi | 90% | 2402 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 52,388 psi | 85% | 2313 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 55,651 psi | 90% | 2054 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 54,882 psi | 89% | 2379 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 50,357 psi | 82% | 2398 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 54,897 psi | 89% | 2329 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 54,114 psi | 88% | 2379 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 54,302 psi | 88% | 2402 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 54,157 psi | 88% | 2293 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 53,229 psi | 86% | 2290 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 53,330 psi | 87% | 2382 fps | 99.9% |
| Somchem S335 | <<locked>> | 94% | 52,678 psi | 85% | 2293 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 53,316 psi | 86% | 2375 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,530 psi | 80% | 2349 fps | 99.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,389 psi | 57% | 2201 fps | 97.6% |
| Vihtavuori N120 | <<locked>> | 82% | 52,692 psi | 85% | 2198 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 54,172 psi | 88% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 53,824 psi | 87% | 2283 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 53,345 psi | 87% | 2346 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 55,216 psi | 90% | 2362 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 47,688 psi | 77% | 2297 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 42,032 psi | 68% | 2247 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 92% | 52,591 psi | 85% | 2346 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 98% | 53,417 psi | 87% | 2365 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,671 psi | 71% | 2247 fps | 98.2% |
| Winchester 748 | <<locked>> | 94% | 54,752 psi | 89% | 2428 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 53,606 psi | 87% | 2405 fps | 99.6% |
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 2015 | <<locked>> | 80% | 37,376 psi | 61% | 2083 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 47,805 psi | 78% | 2293 fps | 97.9% |
| Accurate 2230 | <<locked>> | 80% | 48,109 psi | 78% | 2303 fps | 98.3% |
| Accurate 2460 | <<locked>> | 80% | 39,929 psi | 65% | 2159 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 29,776 psi | 48% | 2005 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 35,433 psi | 57% | 2119 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 28,181 psi | 46% | 1988 fps | 97.9% |
| Accurate LT-30 | <<locked>> | 80% | 45,876 psi | 74% | 2152 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 46,253 psi | 75% | 2169 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 33,997 psi | 55% | 2077 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 49,864 psi | 81% | 2208 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 37,246 psi | 60% | 2123 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 44,672 psi | 72% | 2244 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,926 psi | 58% | 2090 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 34,389 psi | 56% | 2103 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 41,060 psi | 67% | 2247 fps | 98.1% |
| Alliant Power Pro 2000-MR | 37.4 gr | 88% | 39,711 psi | 64% | 2264 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 31,546 psi | 51% | 2054 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,279 psi | 69% | 2165 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 36,405 psi | 59% | 2146 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 90% | 33,431 psi | 54% | 2146 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,618 psi | 82% | 2221 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,338 psi | 72% | 2152 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 37,521 psi | 61% | 2162 fps | 95.1% |
| Bofors RP3 | <<locked>> | 84% | 30,618 psi | 50% | 2051 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,421 psi | 62% | 2096 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,504 psi | 54% | 2100 fps | 97.4% |
| Hodgdon CFE223 | 34.8 gr | 80% | 36,985 psi | 60% | 2198 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 40,843 psi | 66% | 2185 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 41,278 psi | 67% | 2201 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 41,553 psi | 67% | 2228 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 50,531 psi | 82% | 2228 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 34,127 psi | 55% | 2087 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 34,664 psi | 56% | 2123 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,603 psi | 50% | 2054 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,396 psi | 41% | 1237 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,040 psi | 54% | 2047 fps | 95.6% |
| IMR 3031 | <<locked>> | 80% | 32,895 psi | 53% | 2096 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 34,664 psi | 56% | 2067 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 94% | 51,140 psi | 83% | 2297 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 43,265 psi | 70% | 2136 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 32,750 psi | 53% | 2083 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 35,926 psi | 58% | 2090 fps | 97.3% |
| Lovex D073.4 | <<locked>> | 80% | 48,588 psi | 79% | 2290 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 39,871 psi | 65% | 2165 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 31,850 psi | 52% | 2060 fps | 98% |
| Lovex S060 | <<locked>> | 80% | 35,404 psi | 57% | 2037 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 30,095 psi | 49% | 1988 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 48,037 psi | 78% | 2221 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,620 psi | 55% | 2047 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 33,228 psi | 54% | 2060 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 33,504 psi | 54% | 2093 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 35,578 psi | 58% | 2149 fps | 95.5% |
| Ramshot TAC | <<locked>> | 86% | 43,468 psi | 71% | 2218 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,592 psi | 56% | 2100 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 39,102 psi | 63% | 2133 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,512 psi | 41% | 1266 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,538 psi | 66% | 2172 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 48,544 psi | 79% | 2306 fps | 95.3% |
| ReloadSwiss RS 52 | 34.6 gr | 84% | 35,172 psi | 57% | 2175 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 29,559 psi | 48% | 2064 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 37,202 psi | 60% | 2096 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 31,865 psi | 52% | 2005 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 86% | 30,806 psi | 50% | 2047 fps | 95.2% |
| Shooters World AR Plus | <<locked>> | 80% | 48,588 psi | 79% | 2290 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,850 psi | 52% | 2060 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 30,095 psi | 49% | 1988 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,641 psi | 69% | 2175 fps | 98.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,270 psi | 82% | 1995 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 44,962 psi | 73% | 2251 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 34,635 psi | 56% | 2136 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,975 psi | 70% | 2175 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 41,002 psi | 67% | 2188 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 34,780 psi | 56% | 2093 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,317 psi | 57% | 2024 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,703 psi | 47% | 1913 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 38,276 psi | 62% | 2159 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 34,867 psi | 57% | 2031 fps | 99.5% |
| Somchem S341 | <<locked>> | 82% | 35,549 psi | 58% | 2103 fps | 95.7% |
| Somchem S355 | <<locked>> | 86% | 32,097 psi | 52% | 2057 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 29,457 psi | 48% | 2067 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 49,850 psi | 81% | 2169 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 40,147 psi | 65% | 2090 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,273 psi | 57% | 2028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,327 psi | 49% | 2005 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 31,430 psi | 51% | 2008 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 28,660 psi | 46% | 1965 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 98% | 39,494 psi | 64% | 2205 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 35,810 psi | 58% | 2090 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 80% | 30,066 psi | 49% | 1995 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 33,634 psi | 55% | 2067 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 34,330 psi | 56% | 2116 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,720 psi | 51% | 2051 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 117 powders for .30 TC loaded with the .308 | 200gr | Woodleigh PP SN. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,516 fps; across all powders the maximum-charge window runs from 1,385 fps to 2,516 fps. Accurate 4064 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (425 MPa), the top charges use 46–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, ADI AR 2208 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 CFE223 rank at the top here: for .30 TC with the .308 | 200gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 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.