Load Specifications
Load data in caliber .338 RCM with .338 | 225gr | Barnes X S 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 LEVERevolution.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 88% | 53,954 psi | 87% | 2418 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,956 psi | 90% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,376 psi | 89% | 2480 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,201 psi | 89% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,201 psi | 89% | 2526 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 54,534 psi | 87% | 2516 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,948 psi | 74% | 2467 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 82% | 53,171 psi | 85% | 2362 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,490 psi | 86% | 2382 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,651 psi | 89% | 2536 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 56,188 psi | 90% | 2526 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 53,621 psi | 86% | 2470 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,810 psi | 88% | 2497 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 54,665 psi | 88% | 2484 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,636 psi | 88% | 2631 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,651 psi | 89% | 2552 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,925 psi | 86% | 2425 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,345 psi | 86% | 2526 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,832 psi | 73% | 2467 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2602 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,521 psi | 89% | 2405 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,984 psi | 88% | 2549 fps | 98.9% |
| Bofors RP3 | <<locked>> | 98% | 56,318 psi | 90% | 2569 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,157 psi | 87% | 2444 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,693 psi | 86% | 2530 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,940 psi | 88% | 2605 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 86% | 55,753 psi | 89% | 2500 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,229 psi | 85% | 2480 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,346 psi | 87% | 2530 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 92% | 56,057 psi | 90% | 2546 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,322 psi | 68% | 2372 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,114 psi | 87% | 2572 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 56% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,056 psi | 87% | 2507 fps | 99.6% |
| IMR 3031 | <<locked>> | 92% | 55,332 psi | 89% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,014 psi | 90% | 2516 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,534 psi | 86% | 2448 fps | 95.8% |
| IMR 4198 | <<locked>> | 84% | 53,795 psi | 86% | 2382 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2510 fps | 96.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,092 psi | 71% | 2421 fps | 97% |
| IMR 4895 | <<locked>> | 94% | 54,592 psi | 88% | 2556 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 54,810 psi | 88% | 2497 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 55,927 psi | 90% | 2493 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,911 psi | 88% | 2520 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,941 psi | 90% | 2474 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 55,738 psi | 89% | 2520 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,329 psi | 82% | 2461 fps | 96.9% |
| Norma 201 | <<locked>> | 92% | 54,810 psi | 88% | 2490 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 54,795 psi | 88% | 2497 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,753 psi | 89% | 2562 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 45,847 psi | 74% | 2461 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 55,608 psi | 89% | 2579 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 55,376 psi | 89% | 2510 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,273 psi | 87% | 2526 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 86% | 52,968 psi | 85% | 2454 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,607 psi | 57% | 1522 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,824 psi | 88% | 2487 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,679 psi | 88% | 2507 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,927 psi | 90% | 2628 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2654 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,629 psi | 73% | 2484 fps | 96.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,702 psi | 75% | 2493 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 88% | 53,621 psi | 86% | 2444 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,361 psi | 89% | 2490 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,811 psi | 89% | 2552 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,329 psi | 82% | 2461 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,911 psi | 88% | 2520 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,738 psi | 89% | 2520 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,810 psi | 88% | 2457 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,186 psi | 87% | 2484 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,621 psi | 86% | 2559 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,273 psi | 87% | 2434 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,809 psi | 86% | 2490 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,853 psi | 86% | 2510 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,505 psi | 86% | 2402 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,985 psi | 90% | 2434 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 52,837 psi | 85% | 2487 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 55,796 psi | 89% | 2441 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,362 psi | 90% | 2530 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2552 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,147 psi | 66% | 2418 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 86% | 53,577 psi | 86% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,318 psi | 90% | 2425 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,114 psi | 87% | 2464 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,984 psi | 88% | 2474 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,288 psi | 87% | 2490 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2457 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 90% | 55,680 psi | 89% | 2500 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 53,345 psi | 86% | 2477 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,340 psi | 76% | 2467 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,327 psi | 79% | 2448 fps | 99.2% |
| Winchester 748 | <<locked>> | 90% | 54,462 psi | 87% | 2539 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,417 psi | 86% | 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% | 42,888 psi | 69% | 2264 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,398 psi | 74% | 2356 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,593 psi | 59% | 2208 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,030 psi | 64% | 2300 fps | 99.5% |
| Accurate 2520 | <<locked>> | 80% | 40,030 psi | 64% | 2300 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 34,577 psi | 55% | 2198 fps | 99.4% |
| Accurate 4350 | <<locked>> | 94% | 37,927 psi | 61% | 2329 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 50,212 psi | 81% | 2323 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,575 psi | 81% | 2339 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,247 psi | 63% | 2270 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 35,549 psi | 57% | 2185 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 50,314 psi | 81% | 2428 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,017 psi | 66% | 2283 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 39,972 psi | 64% | 2287 fps | 100% |
| Alliant Power Pro 2000-MR | 46.7 gr | 82% | 37,405 psi | 60% | 2320 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,779 psi | 53% | 2165 fps | 96.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,095 psi | 77% | 2346 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,302 psi | 57% | 2215 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,798 psi | 62% | 2329 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,272 psi | 55% | 2264 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,255 psi | 79% | 2326 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,840 psi | 61% | 2267 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 32,489 psi | 52% | 2172 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,946 psi | 69% | 2274 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,233 psi | 63% | 2300 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,569 psi | 68% | 2408 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 46,398 psi | 74% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,847 psi | 75% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 39,914 psi | 64% | 2297 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,465 psi | 63% | 2283 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,620 psi | 54% | 2198 fps | 95.4% |
| Hodgdon LEVERevolution | 44.7 gr | 80% | 35,288 psi | 57% | 2251 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 42% | 1322 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,884 psi | 61% | 2241 fps | 97.2% |
| IMR 3031 | <<locked>> | 80% | 38,406 psi | 62% | 2290 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,114 psi | 56% | 2169 fps | 95.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,401 psi | 81% | 2405 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 48,124 psi | 77% | 2310 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 52,286 psi | 84% | 2464 fps | 95.5% |
| IMR 4831 | <<locked>> | 96% | 38,986 psi | 63% | 2329 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 36,056 psi | 58% | 2241 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 41,017 psi | 66% | 2283 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 46,137 psi | 74% | 2359 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 37,855 psi | 61% | 2260 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,755 psi | 64% | 2218 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 35,143 psi | 56% | 2182 fps | 97.3% |
| Lovex S065 | <<locked>> | 94% | 43,366 psi | 70% | 2333 fps | 95% |
| Norma 201 | <<locked>> | 80% | 39,059 psi | 63% | 2241 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 38,551 psi | 62% | 2251 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 34,722 psi | 56% | 2205 fps | 95.7% |
| Norma URP | <<locked>> | 94% | 38,464 psi | 62% | 2323 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 33,997 psi | 55% | 2208 fps | 95% |
| Ramshot TAC | <<locked>> | 82% | 43,410 psi | 70% | 2323 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,755 psi | 64% | 2297 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,251 psi | 71% | 2320 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,585 psi | 43% | 1358 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,600 psi | 73% | 2356 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,486 psi | 78% | 2415 fps | 95.5% |
| ReloadSwiss RS 52 | 44.2 gr | 80% | 36,056 psi | 58% | 2290 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,414 psi | 49% | 2175 fps | 96.6% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 40,234 psi | 65% | 2385 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,801 psi | 70% | 2441 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 43,178 psi | 69% | 2287 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,347 psi | 60% | 2201 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,618 psi | 49% | 2119 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 43,366 psi | 70% | 2333 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,855 psi | 61% | 2260 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 35,143 psi | 56% | 2182 fps | 97.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,254 psi | 77% | 2365 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,734 psi | 81% | 2438 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,331 psi | 57% | 2244 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,385 psi | 78% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,756 psi | 67% | 2303 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,594 psi | 60% | 2244 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,277 psi | 65% | 2205 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,257 psi | 53% | 2090 fps | 99.4% |
| Somchem S321 | <<locked>> | 80% | 43,961 psi | 70% | 2352 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 39,929 psi | 64% | 2211 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 38,566 psi | 62% | 2254 fps | 96.7% |
| Somchem S355 | <<locked>> | 80% | 31,749 psi | 51% | 2129 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 29,254 psi | 47% | 2149 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 45,339 psi | 73% | 2264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,176 psi | 64% | 2205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,868 psi | 58% | 2195 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,361 psi | 58% | 2192 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,863 psi | 48% | 2073 fps | 96.1% |
| Vihtavuori N160 | <<locked>> | 94% | 40,335 psi | 65% | 2323 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 41,031 psi | 66% | 2280 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 35,085 psi | 56% | 2185 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 39,508 psi | 63% | 2329 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,345 psi | 55% | 2175 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 39,697 psi | 64% | 2313 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,666 psi | 59% | 2244 fps | 97% |
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 .338 RCM loaded with the .338 | 225gr | Barnes X S. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,483 fps to 2,654 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 (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:14.0 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 LEVERevolution rank at the top here: for .338 RCM with the .338 | 225gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-23, Alliant Reloder-26, Hodgdon H4350 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.