Load Specifications
Load data in caliber .308 Win. Ackley Improved with .311 | 190gr | Prvi Partizan FMJ BT 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>> | 90% | 53,447 psi | 89% | 2415 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,693 psi | 89% | 2493 fps | 98.9% |
| Accurate 2460 | <<locked>> | 86% | 51,996 psi | 86% | 2438 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,635 psi | 89% | 2467 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 52,997 psi | 88% | 2487 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 52,881 psi | 88% | 2500 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,582 psi | 69% | 2402 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 53,925 psi | 90% | 2369 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,317 psi | 90% | 2388 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 52,301 psi | 87% | 2490 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 98% | 53,214 psi | 88% | 2484 fps | 99% |
| ADI AR 2219 | <<locked>> | 84% | 53,998 psi | 90% | 2474 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 51,721 psi | 86% | 2454 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 90% | 50,908 psi | 85% | 2438 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,301 psi | 89% | 2546 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 51,416 psi | 85% | 2579 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 52,156 psi | 87% | 2503 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,548 psi | 89% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,069 psi | 88% | 2523 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,830 psi | 71% | 2411 fps | 96.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,965 psi | 81% | 2549 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 52,779 psi | 88% | 2369 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 51,721 psi | 86% | 2500 fps | 98.5% |
| Bofors RP3 | <<locked>> | 98% | 51,996 psi | 86% | 2513 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,157 psi | 90% | 2441 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,722 psi | 89% | 2526 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 51,547 psi | 86% | 2556 fps | 99% |
| Hodgdon H322 | <<locked>> | 86% | 52,475 psi | 87% | 2457 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,621 psi | 89% | 2484 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 53,940 psi | 90% | 2523 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 92% | 52,692 psi | 88% | 2500 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,986 psi | 65% | 2313 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 50,720 psi | 84% | 2523 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,374 psi | 57% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,389 psi | 90% | 2507 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 51,445 psi | 85% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 52,591 psi | 87% | 2467 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,780 psi | 89% | 2451 fps | 95.9% |
| IMR 4198 | <<locked>> | 86% | 54,085 psi | 90% | 2382 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,495 psi | 67% | 2362 fps | 96.3% |
| IMR 4895 | <<locked>> | 96% | 54,404 psi | 90% | 2552 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 51,721 psi | 86% | 2454 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 51,619 psi | 86% | 2441 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 50,720 psi | 84% | 2470 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 52,982 psi | 88% | 2431 fps | 99.3% |
| Lovex S062 | <<locked>> | 96% | 51,866 psi | 86% | 2467 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,834 psi | 79% | 2411 fps | 96.3% |
| Norma 200 | <<locked>> | 82% | 53,519 psi | 89% | 2395 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,375 psi | 90% | 2487 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 51,184 psi | 85% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 96% | 52,156 psi | 87% | 2513 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 42,583 psi | 71% | 2405 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 96% | 52,156 psi | 87% | 2530 fps | 99.2% |
| Ramshot TAC | <<locked>> | 90% | 52,156 psi | 87% | 2461 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 50,995 psi | 85% | 2480 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,345 psi | 89% | 2461 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,679 psi | 58% | 1503 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 51,619 psi | 86% | 2444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 51,430 psi | 85% | 2461 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 52,330 psi | 87% | 2575 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,359 psi | 87% | 2608 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,061 psi | 70% | 2425 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 90% | 52,243 psi | 87% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 51,430 psi | 85% | 2441 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,851 psi | 86% | 2503 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,834 psi | 79% | 2411 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 50,720 psi | 84% | 2470 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 51,866 psi | 86% | 2467 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 51,605 psi | 86% | 2415 fps | 99.6% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,186 psi | 90% | 2484 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,780 psi | 89% | 2559 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 51,097 psi | 85% | 2395 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,650 psi | 89% | 2487 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,780 psi | 89% | 2510 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,606 psi | 89% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 52,736 psi | 88% | 2395 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 52,823 psi | 88% | 2487 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 52,344 psi | 87% | 2398 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 52,939 psi | 88% | 2484 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,678 psi | 88% | 2503 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,753 psi | 63% | 2356 fps | 98.5% |
| Vihtavuori N130 | <<locked>> | 88% | 53,476 psi | 89% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,388 psi | 89% | 2388 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,577 psi | 89% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 51,576 psi | 86% | 2431 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,952 psi | 85% | 2448 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,701 psi | 74% | 2402 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 90% | 52,431 psi | 87% | 2457 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 53,171 psi | 88% | 2474 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,714 psi | 73% | 2408 fps | 96.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,166 psi | 77% | 2398 fps | 98.9% |
| Winchester 748 | <<locked>> | 90% | 51,111 psi | 85% | 2497 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,606 psi | 89% | 2520 fps | 99.7% |
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% | 39,436 psi | 66% | 2218 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,256 psi | 83% | 2444 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 42,540 psi | 71% | 2303 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,676 psi | 53% | 2136 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,666 psi | 63% | 2257 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 29,950 psi | 50% | 2116 fps | 98.5% |
| Accurate 4350 | <<locked>> | 96% | 36,434 psi | 61% | 2306 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 47,819 psi | 79% | 2287 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,196 psi | 80% | 2306 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,027 psi | 60% | 2215 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 36,869 psi | 61% | 2218 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 47,340 psi | 79% | 2388 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,014 psi | 63% | 2231 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 36,448 psi | 61% | 2234 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,700 psi | 73% | 2398 fps | 98.7% |
| Alliant Power Pro 2000-MR | 39.6 gr | 84% | 36,970 psi | 61% | 2316 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,486 psi | 49% | 2100 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,657 psi | 74% | 2303 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,185 psi | 57% | 2201 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 96% | 38,116 psi | 63% | 2320 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,156 psi | 55% | 2244 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,499 psi | 77% | 2287 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,086 psi | 62% | 2257 fps | 95.2% |
| Bofors RP3 | <<locked>> | 82% | 30,734 psi | 51% | 2146 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,277 psi | 67% | 2231 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,723 psi | 59% | 2241 fps | 98.1% |
| Hodgdon CFE223 | 38.6 gr | 80% | 39,334 psi | 65% | 2352 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 80% | 43,323 psi | 72% | 2326 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,685 psi | 73% | 2346 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 38,943 psi | 65% | 2287 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 36,245 psi | 60% | 2228 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,445 psi | 54% | 2178 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,343 psi | 54% | 2192 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,454 psi | 42% | 1309 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,027 psi | 58% | 2188 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 34,911 psi | 58% | 2234 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,229 psi | 57% | 2159 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,531 psi | 84% | 2405 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 45,353 psi | 75% | 2270 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 37,913 psi | 63% | 2313 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 32,735 psi | 54% | 2178 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 38,014 psi | 63% | 2231 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 42,264 psi | 70% | 2306 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 34,098 psi | 57% | 2201 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 36,956 psi | 61% | 2169 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 31,705 psi | 53% | 2119 fps | 96.3% |
| Lovex S065 | <<locked>> | 98% | 44,962 psi | 75% | 2362 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 50,212 psi | 83% | 2356 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,273 psi | 59% | 2178 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 35,230 psi | 59% | 2195 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 33,576 psi | 56% | 2192 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 39,972 psi | 66% | 2356 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 84% | 35,288 psi | 59% | 2244 fps | 95.6% |
| Ramshot TAC | <<locked>> | 84% | 43,149 psi | 72% | 2320 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,695 psi | 61% | 2241 fps | 96.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,220 psi | 68% | 2270 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,831 psi | 43% | 1345 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,670 psi | 71% | 2310 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 48,283 psi | 80% | 2415 fps | 95.5% |
| ReloadSwiss RS 52 | 37.5 gr | 82% | 35,215 psi | 59% | 2280 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,427 psi | 46% | 2100 fps | 95% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,175 psi | 65% | 2369 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 38,943 psi | 65% | 2228 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 33,620 psi | 56% | 2139 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 30,879 psi | 51% | 2142 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 44,962 psi | 75% | 2362 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,098 psi | 57% | 2201 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 31,705 psi | 53% | 2119 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,034 psi | 75% | 2320 fps | 99% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,500 psi | 79% | 2395 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,447 psi | 57% | 2231 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,368 psi | 75% | 2316 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,915 psi | 68% | 2293 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,693 psi | 58% | 2188 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,202 psi | 62% | 2156 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,371 psi | 50% | 2041 fps | 99% |
| Somchem S321 | <<locked>> | 80% | 40,495 psi | 67% | 2300 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 36,477 psi | 61% | 2159 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 35,375 psi | 59% | 2198 fps | 95.8% |
| Somchem S355 | <<locked>> | 84% | 32,184 psi | 53% | 2152 fps | 95.5% |
| Somchem S365 | <<locked>> | 92% | 29,559 psi | 49% | 2169 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 42,235 psi | 70% | 2224 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,231 psi | 62% | 2159 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,372 psi | 54% | 2139 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,257 psi | 55% | 2139 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 28,558 psi | 47% | 2054 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 96% | 39,595 psi | 66% | 2313 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 37,826 psi | 63% | 2228 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 32,024 psi | 53% | 2129 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 96% | 38,508 psi | 64% | 2316 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,562 psi | 56% | 2165 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 36,651 psi | 61% | 2264 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,533 psi | 56% | 2188 fps | 96.1% |
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 109 powders for .308 Win. Ackley Improved loaded with the .311 | 190gr | Prvi Partizan FMJ BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,608 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,608 fps. Accurate 4350 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (415 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.311" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 .308 Win. Ackley Improved with the .311 | 190gr | Prvi Partizan FMJ BT 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.