Description
Somchem S365 is a medium burn rate propellant, particularly suitable for rifle cartridges. Renowned for its consistency and performance in medium to large capacity cases, this powder caters to reloaders seeking precision loads for cartridges such as the .30-06 Springfield and .270 Winchester. Its extruded grain form ensures uniform ignition and combustion, although meticulous attention during metering is recommended to ensure consistent charge weights. Handloaders often appreciate S365 for its comprehensive temperature stability, enabling dependable performance across varied environmental conditions. This stability is crucial for those developing loads for hunting or target shooting in diverse climates. Careful load development is essential to maximize the benefits of S365, particularly in achieving optimal pressures and velocity. This propellant's ability to deliver excellent accuracy with reduced deviation in velocity makes it an advantageous choice for precision shooting. Somchem's reputation for producing reliable, high-performance propellants enhances the appeal of S365 among experienced handloaders seeking dependable results.
Specifications
Burn Rate
3 (Medium-Slow)
Bulk Density
0.915 g/cm³
Density
1.600 g/cm³
Temperature Sensitivity
Low
Suitable Substitutes
Powders with a similar burn rate that may be suitable alternatives (also see burn rate chart):
Standard Loads — Somchem S365
Verified load data combinations using Somchem S365.
.20 BR
Berger .204 | 55gr | Berger Varmint 55gr
.20 BR
Hornady .204 | 45gr | Hornady SP 45gr
.20 Nosler
Hornady .204 | 45gr | Hornady SP 45gr
.22 ARC
Berger .224 | 77gr | Berger OTM Tactical 77gr
.22 ARC
Berger .224 | 80gr | Berger VLD Target 80gr
.22 ARC
Berger .224 | 80.5gr | Berger Fullbore Target 80.5gr
.22 ARC
Hornady .224 | 75gr | Hornady ELD Match 75gr
.22 ARC
Hornady .224 | 75gr | Hornady Match 75gr
.22 ARC
Hornady .224 | 77gr | Hornady AEROMATCH 77gr
.22 ARC
Hornady .224 | 80gr | Hornady ELD-X 80gr
.22 ARC
Hornady .224 | 80gr | Hornady ELD Match 80gr
.22 ARC
Nosler .224 | 77gr | Nosler RDF 77gr
.22 ARC
Nosler .224 | 80gr | Nosler Custom Competition 80gr
.22 ARC
RMR .224 | 75gr | RMR BTHP 75gr
.22 ARC
RMR .224 | 75gr | RMR BTHP 3GH 75gr
.22 ARC
Sierra .224 | 77gr | Sierra HPBT MatchKing 77gr
.22 ARC
Sierra .224 | 90gr | Sierra HPBT MatchKinging 90gr
.22 ARC (bolt action)
Barnes .224 | 77gr | Barnes Match Burner BT 77gr
Subsonic Loads — Somchem S365
Verified subsonic load data combinations using Somchem S365.
.30-06 Spring.
Berger .308 | 230gr | Berger Hybrid OTM Tactical 230gr
.30-06 Spring.
Berger .308 | 230gr | Berger Hybrid Target 230gr
.30-06 Spring.
Discreet Ballistics .308 | 188gr | Discreet Ballistics Selous Machined Expander 188gr
.30-06 Spring.
Hornady .308 | 175gr | Hornady Sub-X 175gr
.30-06 Spring.
Hornady .308 | 190gr | Hornady Sub-X 190gr
.30-06 Spring.
Lapua .308 | 200gr | Lapua Subsonic 200gr
.30-06 Spring.
MAKER .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets 200gr
.30-06 Spring.
MAKER .308 | 220gr | MAKER 300 blackout 220gr
.30-06 Spring.
Peregrine .308 | 155gr | Peregrine Subsonic 155gr
.30-06 Spring.
Reichenberg .308 | 154gr | Reichenberg HDB Subsonic 154gr
.30-06 Spring.
Reichenberg .308 | 200gr | Reichenberg Subsonic 200gr
.30-06 Spring.
Sierra .308 | 220gr | Sierra MatchKing 220gr
.30-06 Spring.
Styria Arms | AERO .308 | 115gr | AERO SUB,- smax:11.40 115gr
.30-06 Spring.
Styria Arms | AERO .308 | 190gr | AERO SUB,- smax:23.90 190gr
.308 Win.
Discreet Ballistics .308 | 188gr | Discreet Ballistics Selous Machined Expander 188gr
.308 Win.
Hornady .308 | 175gr | Hornady Sub-X 175gr
.308 Win.
Hornady .308 | 190gr | Hornady Sub-X 190gr
.308 Win.
Lapua .308 | 200gr | Lapua Subsonic 200gr
Community Loads — Somchem S365
Sample load data calculated with Somchem S365.
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| Cartridge | Bullet | Barrel (in) | Charge (gr) | OAL (in) | Case Volume (GoW) | Max. Pressure (psi) | Muzzle Velocity (fps) |
|---|---|---|---|---|---|---|---|
| .224 | 73gr | Hornady ELD-Match | 28.0 | 35.5 | 2.45 | 45.9 | 41,060 (70%) | 3136 | |
| .224 | 70gr | Nosler RDF HPBT | 24.0 | 33.0 | 2.35 | 43.5 | 36,463 (62%) | 2933 | |
| .243 | 87gr | Berger VLD Hunting | 24.0 | ••.• | 2.67 | 54.0 | 53,722 (89%) | 3114 | |
| .243 | 87gr | Berger VLD Hunting | 24.0 | ••.• | 2.71 | 53.0 | 53,214 (88%) | 3100 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 55,550 (92%) | 3077 | |
| .243 | 87gr | Berger VLD Hunting | 24.0 | ••.• | 2.71 | 54.0 | 51,372 (85%) | 3077 | |
| .243 | 87gr | Berger VLD Hunting | 24.0 | ••.• | 2.71 | 54.0 | 51,097 (85%) | 3074 | |
| .243 | 87gr | Berger VLD Hunting | 24.0 | 43.2 | 2.75 | 53.0 | 49,095 (82%) | 3038 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 52,214 (87%) | 3028 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 51,387 (85%) | 3015 | |
| .243 | 95gr | Hornady SST InterLock | 21.0 | ••.• | 2.71 | 54.0 | 60,959 (101%) | 3002 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 48,704 (81%) | 2972 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 46,470 (77%) | 2936 | |
| .243 | 87gr | Hornady V-MAX | 24.0 | ••.• | 2.71 | 54.0 | 42,409 (70%) | 2927 | |
| .243 | 85gr | Sierra SPT Pro-Hunter | 23.6 | ••.• | 2.83 | 54.0 | 41,321 (69%) | 2923 | |
| .243 | 87gr | Hornady V-MAX | 22.0 | ••.• | 2.67 | 54.0 | 44,425 (74%) | 2897 | |
| .243 | 95gr | Berger VLD Hunting | 24.0 | ••.• | 2.71 | 54.0 | 43,337 (72%) | 2795 | |
| .243 | 85gr | Sierra GameKing | 20.0 | ••.• | 2.71 | 54.0 | 41,234 (69%) | 2789 |
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