Load Specifications
Load data in caliber .357 Mag. with .358 | 130gr | Rim Rock RNFP Cowboy bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Rottweil P 806, Vihtavuori N105 and ADI AP 100.
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 ≥ 60% and propellant combustion ≥ 80%. 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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Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 76% | 39,073 psi | 90% | 1457 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 36,912 psi | 85% | 1581 fps | 92.1% |
| Accurate Solo 1000² | <<locked>> | 76% | 36,970 psi | 85% | 1325 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 35,897 psi | 83% | 1375 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 35,621 psi | 82% | 1509 fps | 98.6% |
| ADI AP 70N² | <<locked>> | 68% | 37,536 psi | 86% | 1411 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,145 psi | 88% | 1230 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,289 psi | 86% | 1253 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 38,827 psi | 89% | 1316 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 38,928 psi | 89% | 1368 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 37,898 psi | 87% | 1385 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 38,580 psi | 89% | 1594 fps | 91.6% |
| Alliant BULLSEYE² | <<locked>> | 72% | 37,608 psi | 86% | 1473 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 39,291 psi | 90% | 1375 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 37,115 psi | 85% | 1467 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 36,970 psi | 85% | 1578 fps | 98.4% |
| Alliant RED DOT | <<locked>> | 80% | 37,681 psi | 87% | 1325 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 39,218 psi | 90% | 1496 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 36,463 psi | 84% | 1463 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 35,824 psi | 82% | 1319 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,304 psi | 86% | 1348 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 36,405 psi | 84% | 1345 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 38,870 psi | 89% | 1250 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 39,262 psi | 90% | 1535 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 37,927 psi | 87% | 1512 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,158 psi | 39% | 1001 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 38,421 psi | 88% | 1421 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 36,912 psi | 85% | 1581 fps | 92.1% |
| Lovex S011² | <<locked>> | 64% | 34,882 psi | 80% | 1335 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 35,578 psi | 82% | 1407 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,115 psi | 85% | 1385 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,014 psi | 85% | 1385 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 37,304 psi | 86% | 1362 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 36,506 psi | 84% | 1329 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,014 psi | 85% | 1286 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 38,116 psi | 88% | 1483 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 39,160 psi | 90% | 1519 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 35,969 psi | 83% | 1355 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 15,737 psi | 36% | 1007 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 39,146 psi | 90% | 1486 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 38,653 psi | 89% | 1598 fps | 94.9% |
| Rottweil P 801² | <<locked>> | 64% | 35,375 psi | 81% | 1312 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 38,014 psi | 87% | 1604 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 36,912 psi | 85% | 1581 fps | 92.1% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,536 psi | 86% | 1427 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,290 psi | 88% | 1385 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,304 psi | 86% | 1394 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,189 psi | 88% | 1263 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 36,695 psi | 84% | 1480 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,477 psi | 84% | 1391 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 37,521 psi | 86% | 1588 fps | 99.4% |
| Somchem MP200² | <<locked>> | 76% | 38,493 psi | 88% | 1480 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 37,971 psi | 87% | 1447 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 35,012 psi | 80% | 1516 fps | 96.2% |
| Vihtavuori 3N37 | <<locked>> | 80% | 35,578 psi | 82% | 1490 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 92% | 35,114 psi | 81% | 1529 fps | 94.4% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 35,824 psi | 82% | 1601 fps | 98% |
| Vihtavuori N320² | <<locked>> | 76% | 39,175 psi | 90% | 1365 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 36,782 psi | 85% | 1257 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 37,260 psi | 86% | 1404 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 37,391 psi | 86% | 1444 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 36,303 psi | 83% | 1493 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 36,448 psi | 84% | 1371 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 38,783 psi | 89% | 1427 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 23,670 psi | 54% | 1234 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 68% | 27,325 psi | 63% | 1421 fps | 87% |
| Accurate Solo 1000² | <<locked>> | 60% | 24,743 psi | 57% | 1158 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 20,885 psi | 48% | 1152 fps | 100% |
| ADI AP 100*² | 7.4 gr | 64% | 15,476 psi | 36% | 1089 fps | 86.4% |
| ADI AP 70N² | <<locked>> | 60% | 30,269 psi | 70% | 1316 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,513 psi | 61% | 1079 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,744 psi | 59% | 1102 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 24,497 psi | 56% | 1125 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,469 psi | 61% | 1201 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 21,886 psi | 50% | 1161 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 27,891 psi | 64% | 1414 fps | 86% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,122 psi | 62% | 1316 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 23,975 psi | 55% | 1161 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 15,360 psi | 35% | 1070 fps | 98.7% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,189 psi | 46% | 1250 fps | 90.2% |
| Alliant RED DOT² | <<locked>> | 60% | 23,453 psi | 54% | 1125 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 30,937 psi | 71% | 1385 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,190 psi | 49% | 1214 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,279 psi | 54% | 1145 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,968 psi | 34% | 1004 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 25,628 psi | 59% | 1204 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 26,934 psi | 62% | 1099 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,081 psi | 69% | 1401 fps | 99.2% |
| Hodgdon Longshot² | <<locked>> | 60% | 32,808 psi | 75% | 1440 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,832 psi | 18% | 745 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 25,237 psi | 58% | 1237 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 27,325 psi | 63% | 1421 fps | 87% |
| Lovex S011² | <<locked>> | 60% | 30,574 psi | 70% | 1276 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 24,613 psi | 57% | 1250 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,015 psi | 46% | 1129 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 21,263 psi | 49% | 1158 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 22,640 psi | 52% | 1155 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,395 psi | 56% | 1165 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,369 psi | 63% | 1161 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 29,979 psi | 69% | 1371 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 34,664 psi | 80% | 1460 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,674 psi | 66% | 1260 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,455 psi | 17% | 745 fps | 99.3% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 19,725 psi | 45% | 1191 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 23,714 psi | 55% | 1329 fps | 86.9% |
| Rottweil P 801² | <<locked>> | 60% | 32,082 psi | 74% | 1273 fps | 100% |
| Rottweil P 806*² | 10.1 gr | 60% | 14,489 psi | 33% | 1142 fps | 90.7% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 27,325 psi | 63% | 1421 fps | 87% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,015 psi | 46% | 1152 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 24,656 psi | 57% | 1198 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 23,801 psi | 55% | 1204 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,021 psi | 64% | 1135 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 16,853 psi | 39% | 1112 fps | 93.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,293 psi | 54% | 1198 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 21,857 psi | 50% | 1306 fps | 93.7% |
| Somchem MP200² | <<locked>> | 60% | 24,236 psi | 56% | 1266 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,234 psi | 51% | 1207 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 26,556 psi | 61% | 1368 fps | 92.3% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,377 psi | 45% | 1201 fps | 96.8% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 22,075 psi | 51% | 1289 fps | 86.7% |
| Vihtavuori N105*² | 10 gr | 76% | 17,100 psi | 39% | 1217 fps | 85.8% |
| Vihtavuori N320² | <<locked>> | 60% | 25,150 psi | 58% | 1184 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,910 psi | 34% | 935 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 23,612 psi | 54% | 1220 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 21,306 psi | 49% | 1198 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 17,419 psi | 40% | 1148 fps | 95.8% |
| Winchester 231² | <<locked>> | 60% | 32,358 psi | 74% | 1319 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 20,595 psi | 47% | 1158 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 64 powders for .357 Mag. loaded with the .358 | 130gr | Rim Rock RNFP Cowboy. Rottweil P 806 delivers the highest muzzle velocity at 1,604 fps; across all powders the maximum-charge window runs from 1,001 fps to 1,604 fps. Alliant BLUE DOT gives the best case fill at 100 %, and 29 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 36–90 %, leaving at least 10 % headroom. Alliant BLUE DOT, Hodgdon TrailBoss, ReloadSwiss RS 14 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. Rottweil P 806, Vihtavuori N105, ADI AP 100 rank at the top here: for .357 Mag. with the .358 | 130gr | Rim Rock RNFP Cowboy they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Alliant BLUE DOT, Lovex D037.1 burn incompletely and react more sensitively to barrel length and temperature. ADI AP 100, ADI APS 350, ADI APS 450 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.