Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:250 gr
Bullet Diameter:0.358"
Bullet Length:<<locked>>
Caliber:.358 Norma Mag. load data
Case Length (l3):2.519"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:88 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber .358 Norma Mag. with .358 | 250gr | Speer Grand Slam bullet and 105 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 60 and ReloadSwiss RS 52.
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% | 57,566 psi | 90% | 2559 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,956 psi | 88% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,463 psi | 87% | 2579 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 57,740 psi | 90% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,361 psi | 87% | 2575 fps | 96.5% |
| Accurate 4064 | <<locked>> | 94% | 54,998 psi | 86% | 2618 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 2638 fps | 99% |
| Accurate LT-30 | <<locked>> | 82% | 56,550 psi | 89% | 2503 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,985 psi | 89% | 2526 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,492 psi | 89% | 2654 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 57,188 psi | 90% | 2648 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,680 psi | 87% | 2612 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,854 psi | 88% | 2582 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,406 psi | 90% | 2707 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,796 psi | 87% | 2762 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,898 psi | 89% | 2667 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,217 psi | 90% | 2562 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 57,711 psi | 90% | 2690 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,588 psi | 78% | 2644 fps | 99.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2785 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,172 psi | 55% | 2392 fps | 97.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,622 psi | 87% | 2503 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,173 psi | 88% | 2667 fps | 99.6% |
| Bofors RP3 | <<locked>> | 96% | 57,421 psi | 90% | 2684 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,375 psi | 85% | 2602 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 57,522 psi | 90% | 2592 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,549 psi | 85% | 2638 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,550 psi | 89% | 2726 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 56,405 psi | 88% | 2605 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 57,435 psi | 90% | 2631 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,056 psi | 86% | 2648 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2687 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 98% | 55,332 psi | 87% | 2654 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 90% | 57,014 psi | 89% | 2664 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,643 psi | 72% | 2533 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,912 psi | 88% | 2694 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,288 psi | 87% | 2723 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,114 psi | 55% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,868 psi | 86% | 2618 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,536 psi | 89% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,695 psi | 89% | 2631 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,232 psi | 90% | 2615 fps | 97.6% |
| IMR 4198 | <<locked>> | 84% | 57,276 psi | 90% | 2520 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 2572 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,492 psi | 89% | 2635 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 2585 fps | 98.7% |
| IMR 4895 | <<locked>> | 92% | 55,651 psi | 87% | 2674 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 55,680 psi | 87% | 2612 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,695 psi | 87% | 2595 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,840 psi | 88% | 2631 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,173 psi | 88% | 2585 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 56,434 psi | 88% | 2631 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2628 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 2612 fps | 97.2% |
| Norma 201 | <<locked>> | 90% | 55,143 psi | 86% | 2602 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,521 psi | 87% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,855 psi | 89% | 2677 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2631 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 94% | 57,363 psi | 90% | 2703 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,182 psi | 77% | 2621 fps | 97.2% |
| Ramshot TAC | <<locked>> | 88% | 55,941 psi | 88% | 2628 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,245 psi | 87% | 2644 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,623 psi | 89% | 2612 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 56% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,201 psi | 87% | 2592 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,796 psi | 87% | 2631 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,259 psi | 85% | 2703 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 57,493 psi | 90% | 2785 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2657 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2680 fps | 98.4% |
| Rottweil R 901 | <<locked>> | 88% | 56,086 psi | 88% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,405 psi | 87% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 57,261 psi | 90% | 2674 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,375 psi | 85% | 2602 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2628 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,840 psi | 88% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,434 psi | 88% | 2631 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 2612 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,926 psi | 86% | 2566 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,376 psi | 87% | 2684 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,795 psi | 86% | 2539 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,244 psi | 85% | 2605 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,636 psi | 86% | 2625 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 57,029 psi | 89% | 2546 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,768 psi | 89% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2585 fps | 97.4% |
| Somchem S321 | <<locked>> | 86% | 56,971 psi | 89% | 2644 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,173 psi | 88% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 57,363 psi | 90% | 2648 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 57,566 psi | 90% | 2671 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,715 psi | 70% | 2582 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 56,768 psi | 89% | 2510 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,072 psi | 89% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,810 psi | 86% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,144 psi | 88% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,753 psi | 87% | 2608 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 2628 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 88% | 56,115 psi | 88% | 2608 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 57,595 psi | 90% | 2625 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2635 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2461 fps | 97.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2615 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,767 psi | 87% | 2654 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2687 fps | 97.3% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,418 psi | 85% | 2635 fps | 100% |
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% | 44,860 psi | 70% | 2392 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,892 psi | 77% | 2490 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,579 psi | 59% | 2320 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,135 psi | 69% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,733 psi | 76% | 2477 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,520 psi | 56% | 2310 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 35,955 psi | 56% | 2382 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 53,142 psi | 83% | 2461 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,519 psi | 84% | 2484 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,307 psi | 65% | 2411 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,099 psi | 55% | 2274 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,337 psi | 68% | 2421 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 43,076 psi | 68% | 2415 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,444 psi | 79% | 2605 fps | 99.8% |
| Alliant Power Pro 2000-MR | 60.2 gr | 80% | 37,289 psi | 58% | 2428 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,534 psi | 54% | 2293 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,618 psi | 79% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,115 psi | 58% | 2349 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,593 psi | 57% | 2392 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 82% | 31,647 psi | 50% | 2303 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,154 psi | 49% | 2293 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,257 psi | 82% | 2461 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,205 psi | 63% | 2411 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 33,881 psi | 53% | 2293 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 48,196 psi | 76% | 2507 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,194 psi | 71% | 2415 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,742 psi | 65% | 2441 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,803 psi | 72% | 2566 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 49,429 psi | 77% | 2510 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,357 psi | 79% | 2536 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 37,318 psi | 58% | 2346 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 44,324 psi | 69% | 2530 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 96% | 51,808 psi | 81% | 2602 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 41,611 psi | 65% | 2421 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,617 psi | 46% | 2198 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,449 psi | 59% | 2392 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 96% | 47,979 psi | 75% | 2608 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 41% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,001 psi | 63% | 2379 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 40,959 psi | 64% | 2421 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,825 psi | 58% | 2303 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,672 psi | 70% | 2418 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 51,082 psi | 80% | 2441 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 47,819 psi | 75% | 2526 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,065 psi | 74% | 2490 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 34,911 psi | 55% | 2343 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,971 psi | 60% | 2379 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 43,337 psi | 68% | 2421 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 48,718 psi | 76% | 2500 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,943 psi | 63% | 2392 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 41,800 psi | 66% | 2359 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 36,767 psi | 58% | 2313 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 40,901 psi | 64% | 2392 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 43,830 psi | 69% | 2464 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,538 psi | 64% | 2372 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 40,669 psi | 64% | 2382 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,492 psi | 57% | 2339 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 36,492 psi | 57% | 2385 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 35,897 psi | 56% | 2349 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 96% | 43,323 psi | 68% | 2520 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 43,120 psi | 68% | 2421 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,511 psi | 67% | 2444 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,746 psi | 73% | 2464 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,397 psi | 41% | 1430 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,530 psi | 76% | 2497 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,076 psi | 68% | 2431 fps | 95.3% |
| ReloadSwiss RS 52 | 58.3 gr | 80% | 38,377 psi | 60% | 2438 fps | 97.2% |
| ReloadSwiss RS 60 | 59.3 gr | 80% | 31,705 psi | 50% | 2316 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,824 psi | 56% | 2395 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,928 psi | 61% | 2457 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 44,425 psi | 70% | 2415 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,624 psi | 61% | 2326 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 31,908 psi | 50% | 2244 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 48,196 psi | 76% | 2507 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,901 psi | 64% | 2392 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,943 psi | 63% | 2392 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 36,767 psi | 58% | 2313 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 43,830 psi | 69% | 2464 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,343 psi | 80% | 2516 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,866 psi | 52% | 2283 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,387 psi | 81% | 2497 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,234 psi | 65% | 2395 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,711 psi | 62% | 2382 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,974 psi | 66% | 2333 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,693 psi | 54% | 2211 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 45,890 psi | 72% | 2438 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 46,586 psi | 73% | 2493 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,597 psi | 65% | 2336 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,002 psi | 64% | 2398 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 32,953 psi | 52% | 2251 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 26,977 psi | 42% | 2185 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,485 psi | 74% | 2392 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,206 psi | 66% | 2329 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,652 psi | 59% | 2316 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,479 psi | 60% | 2323 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,241 psi | 49% | 2195 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 35,940 psi | 56% | 2336 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 43,265 psi | 68% | 2418 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 36,927 psi | 58% | 2310 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 37,434 psi | 59% | 2385 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 33,199 psi | 52% | 2365 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,733 psi | 47% | 2169 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 42,453 psi | 67% | 2457 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 44,527 psi | 70% | 2533 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,117 psi | 61% | 2385 fps | 98.4% |
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 105 powders for .358 Norma Mag. loaded with the .358 | 250gr | Speer Grand Slam. Alliant Reloder-17 delivers the highest muzzle velocity at 2,785 fps; across all powders the maximum-charge window runs from 1,565 fps to 2,785 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.358" calls for a 1:6.0 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 60, ReloadSwiss RS 52 rank at the top here: for .358 Norma Mag. with the .358 | 250gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.