Load Specifications
Load data in caliber .300 CR with .308 | 200gr | Swift A-Frame 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% | 53,461 psi | 86% | 2287 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 54,578 psi | 88% | 2369 fps | 98.9% |
| Accurate 2230 | <<locked>> | 84% | 55,187 psi | 88% | 2379 fps | 99.2% |
| Accurate 2460 | <<locked>> | 90% | 55,695 psi | 89% | 2352 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 52,939 psi | 85% | 2336 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 52,707 psi | 85% | 2356 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 52,475 psi | 84% | 2369 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 54,636 psi | 88% | 2244 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 55,100 psi | 88% | 2264 fps | 100% |
| ADI AR 2206H | <<locked>> | 96% | 55,912 psi | 90% | 2405 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 84% | 55,753 psi | 89% | 2257 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 53,330 psi | 86% | 2352 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 86% | 54,128 psi | 87% | 2346 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 55,434 psi | 89% | 2369 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 54,259 psi | 87% | 2349 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 53,127 psi | 85% | 2408 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 54,969 psi | 88% | 2490 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2369 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 88% | 53,896 psi | 86% | 2297 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2428 fps | 99.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 45,730 psi | 73% | 2362 fps | 98.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 53,505 psi | 86% | 2238 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 53,287 psi | 85% | 2247 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 55,230 psi | 89% | 2415 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 51,532 psi | 83% | 2379 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 92% | 54,404 psi | 87% | 2313 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 53,592 psi | 86% | 2395 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 92% | 55,274 psi | 89% | 2470 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 90% | 56,376 psi | 90% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 53,809 psi | 86% | 2356 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2392 fps | 98% |
| Hodgdon H4198 | <<locked>> | 82% | 53,403 psi | 86% | 2247 fps | 100% |
| Hodgdon H4895 | <<locked>> | 96% | 56,318 psi | 90% | 2415 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,376 psi | 58% | 2142 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 54,027 psi | 87% | 2431 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,142 psi | 55% | 1371 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 54,215 psi | 87% | 2369 fps | 99.6% |
| IMR 3031 | <<locked>> | 96% | 54,766 psi | 88% | 2398 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 56,231 psi | 90% | 2379 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 96% | 54,143 psi | 87% | 2320 fps | 95.7% |
| IMR 4198 | <<locked>> | 88% | 54,737 psi | 88% | 2260 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 53,954 psi | 87% | 2411 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 94% | 55,434 psi | 89% | 2369 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 84% | 55,680 psi | 89% | 2359 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 55,593 psi | 89% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 54,157 psi | 87% | 2382 fps | 100% |
| Lovex S060 | <<locked>> | 96% | 56,362 psi | 90% | 2339 fps | 99.5% |
| Lovex S062ᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2379 fps | 99.9% |
| Norma 200 | <<locked>> | 84% | 53,664 psi | 86% | 2270 fps | 100% |
| Norma 201 | <<locked>> | 96% | 54,259 psi | 87% | 2356 fps | 99.9% |
| Norma 202 | <<locked>> | 96% | 54,389 psi | 87% | 2359 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 55,158 psi | 88% | 2418 fps | 99.5% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 55,927 psi | 90% | 2444 fps | 99.4% |
| Ramshot TAC | <<locked>> | 94% | 55,941 psi | 90% | 2379 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 94% | 54,737 psi | 88% | 2398 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 90% | 53,722 psi | 86% | 2333 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,171 psi | 55% | 1401 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 55,405 psi | 89% | 2359 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2372 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 55,956 psi | 90% | 2487 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 48,878 psi | 78% | 2421 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 55,463 psi | 89% | 2343 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 54,795 psi | 88% | 2352 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,066 psi | 77% | 2323 fps | 99.2% |
| Shooters World AR Plus | <<locked>> | 84% | 55,680 psi | 89% | 2359 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 96% | 54,157 psi | 87% | 2382 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2379 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 55,854 psi | 90% | 2336 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 55,782 psi | 89% | 2037 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 54,462 psi | 87% | 2356 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 50,227 psi | 81% | 2379 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 55,056 psi | 88% | 2313 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 53,490 psi | 86% | 2352 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 54,114 psi | 87% | 2379 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 54,027 psi | 87% | 2277 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2270 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 53,113 psi | 85% | 2359 fps | 99.9% |
| Somchem S335 | <<locked>> | 96% | 55,622 psi | 89% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 53,171 psi | 85% | 2356 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2329 fps | 99.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,201 psi | 56% | 2182 fps | 97.5% |
| Vihtavuori N120 | <<locked>> | 84% | 55,651 psi | 89% | 2215 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 53,940 psi | 86% | 2251 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 53,679 psi | 86% | 2264 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 53,330 psi | 86% | 2326 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 54,940 psi | 88% | 2343 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 47,485 psi | 76% | 2277 fps | 99.6% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 41,901 psi | 67% | 2228 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 94% | 56,188 psi | 90% | 2369 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 53,272 psi | 85% | 2346 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,439 psi | 70% | 2224 fps | 98.1% |
| Winchester 748 | <<locked>> | 94% | 54,505 psi | 87% | 2408 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 53,417 psi | 86% | 2385 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% | 36,941 psi | 59% | 2064 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 47,863 psi | 77% | 2277 fps | 97.9% |
| Accurate 2230 | <<locked>> | 80% | 47,950 psi | 77% | 2283 fps | 98.3% |
| Accurate 2460 | <<locked>> | 80% | 40,030 psi | 64% | 2142 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 29,443 psi | 47% | 1985 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 35,230 psi | 56% | 2100 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 27,891 psi | 45% | 1965 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 80% | 45,513 psi | 73% | 2133 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 45,861 psi | 74% | 2146 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 33,968 psi | 54% | 2060 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 49,748 psi | 80% | 2192 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 37,072 psi | 59% | 2103 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 44,411 psi | 71% | 2221 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,940 psi | 58% | 2077 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 34,301 psi | 55% | 2083 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 41,060 psi | 66% | 2231 fps | 98.1% |
| Alliant Power Pro 2000-MR | 36.7 gr | 88% | 39,755 psi | 64% | 2247 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 31,314 psi | 50% | 2034 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,134 psi | 68% | 2146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 36,245 psi | 58% | 2126 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 92% | 35,331 psi | 57% | 2172 fps | 95.8% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,589 psi | 81% | 2205 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,193 psi | 71% | 2133 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 37,492 psi | 60% | 2146 fps | 95.1% |
| Bofors RP3 | <<locked>> | 84% | 30,429 psi | 49% | 2031 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,101 psi | 61% | 2077 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,344 psi | 53% | 2080 fps | 97.3% |
| Hodgdon CFE223 | 34.1 gr | 80% | 36,869 psi | 59% | 2182 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 40,843 psi | 65% | 2169 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 41,075 psi | 66% | 2182 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 41,568 psi | 67% | 2211 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 50,067 psi | 80% | 2205 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 34,142 psi | 55% | 2070 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 34,461 psi | 55% | 2103 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,414 psi | 49% | 2031 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,135 psi | 40% | 1220 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,040 psi | 53% | 2031 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 32,561 psi | 52% | 2077 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 36,695 psi | 59% | 2090 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 94% | 50,792 psi | 81% | 2274 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 43,439 psi | 70% | 2123 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 32,793 psi | 53% | 2070 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 35,940 psi | 58% | 2077 fps | 97.3% |
| Lovex D073.4 | <<locked>> | 80% | 48,370 psi | 78% | 2270 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 39,697 psi | 64% | 2142 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 80% | 31,618 psi | 51% | 2041 fps | 97.9% |
| Lovex S060 | <<locked>> | 80% | 35,070 psi | 56% | 2018 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 29,805 psi | 48% | 1969 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 47,558 psi | 76% | 2198 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,315 psi | 53% | 2028 fps | 96.7% |
| Norma 202 | <<locked>> | 80% | 33,199 psi | 53% | 2044 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 33,562 psi | 54% | 2080 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 35,273 psi | 57% | 2126 fps | 95.3% |
| Ramshot TAC | <<locked>> | 86% | 43,468 psi | 70% | 2201 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,418 psi | 55% | 2080 fps | 95.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 38,943 psi | 62% | 2113 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,266 psi | 41% | 1250 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,234 psi | 65% | 2149 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 48,356 psi | 78% | 2287 fps | 95.2% |
| ReloadSwiss RS 52 | 33.9 gr | 84% | 35,041 psi | 56% | 2156 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 29,457 psi | 47% | 2044 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 36,854 psi | 59% | 2073 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 31,807 psi | 51% | 1988 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 86% | 30,618 psi | 49% | 2028 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 48,370 psi | 78% | 2270 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,618 psi | 51% | 2041 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 29,805 psi | 48% | 1969 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,482 psi | 68% | 2156 fps | 98.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,256 psi | 81% | 1982 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 44,759 psi | 72% | 2228 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 34,316 psi | 55% | 2110 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,902 psi | 69% | 2159 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 40,973 psi | 66% | 2172 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 34,592 psi | 55% | 2073 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,244 psi | 57% | 2008 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,601 psi | 46% | 1896 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 38,116 psi | 61% | 2139 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 34,548 psi | 55% | 2011 fps | 99.5% |
| Somchem S341 | <<locked>> | 82% | 35,476 psi | 57% | 2083 fps | 95.6% |
| Somchem S355 | <<locked>> | 86% | 31,908 psi | 51% | 2037 fps | 95.2% |
| Somchem S365 | <<locked>> | 94% | 29,428 psi | 47% | 2051 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 49,661 psi | 80% | 2149 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 40,030 psi | 64% | 2073 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,157 psi | 56% | 2011 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,240 psi | 48% | 1988 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 31,415 psi | 50% | 1991 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 28,500 psi | 46% | 1946 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 98% | 39,291 psi | 63% | 2185 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 35,505 psi | 57% | 2067 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 80% | 30,081 psi | 48% | 1982 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 33,518 psi | 54% | 2047 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 34,403 psi | 55% | 2103 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,531 psi | 51% | 2031 fps | 95.1% |
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 117 powders for .300 CR loaded with the .308 | 200gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,490 fps; across all powders the maximum-charge window runs from 1,371 fps to 2,490 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 (430 MPa), the top charges use 45–90 %, 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 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 .300 CR with the .308 | 200gr | Swift A-Frame 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.