Description
Somchem S355 is a rifle propellant powder with a medium burn rate, specifically measured at 2.1 on the burn rate scale, making it an excellent choice for a wide range of rifle calibers. It is designed to perform well in cartridges where the balance between pressure and velocity is crucial, such as the 308 Winchester and 30-06 Springfield. The physical form of S355 presents as small, clean-burning granules that contribute to consistent metering properties, ensuring uniform charge weights during the reloading process. This powder exhibits commendable temperature stability, which mitigates the effects of ambiental fluctuations, thereby delivering reliable performance across diverse shooting conditions. Handloaders will appreciate the powder’s ability to facilitate smooth load development, yielding repeatable results with minimal deviations. Somchem, known for its production of high-quality propellants, ensures that S355 offers consistent ignition and pressure characteristics. For the adept reloader, S355 provides a significant advantage in achieving precision and accuracy across a variety of rifle calibers.
Specifications
Burn Rate
4.2 (Medium)
Bulk Density
0.900 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 S355
Verified load data combinations using Somchem S355.
.20 BR
Berger .204 | 35gr | Berger FB Varmint 35gr
.20 BR
Berger .204 | 40gr | Berger Varmint 40gr
.20 BR
Berger .204 | 55gr | Berger Varmint 55gr
.20 BR
Hornady .204 | 40gr | Hornady V-MAX 40gr
.20 BR
Hornady .204 | 45gr | Hornady SP 45gr
.20 BR
Nosler .204 | 40gr | Nosler Ballistic Tip Varmint 40gr
.20 BR
Sierra .204 | 36gr | Sierra Spitzer (SPT) 36gr
.20 BR
Sierra .204 | 39gr | Sierra Tipped VarmintKing 39gr
.20 BR
Speer .204 | 39gr | Speer TNT 39gr
.20 Nosler
Berger .204 | 40gr | Berger Varmint 40gr
.20 Nosler
Hornady .204 | 40gr | Hornady V-MAX 40gr
.20 Nosler
Hornady .204 | 45gr | Hornady SP 45gr
.20 Nosler
Nosler .204 | 40gr | Nosler Ballistic Tip Varmint 40gr
.204 Ruger
Berger .204 | 55gr | Berger Varmint 55gr
.22 ARC
Barnes .224 | 70gr | Barnes TAC-TX BT 70gr
.22 ARC
Barnes .224 | 77gr | Barnes LRX BT 77gr
.22 ARC
Berger .224 | 64gr | Berger Varmint 64gr
.22 ARC
Berger .224 | 77gr | Berger OTM Tactical 77gr
Subsonic Loads — Somchem S355
Verified subsonic load data combinations using Somchem S355.
.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 | 95gr | AERO SUB-I,- smax:11.30 95gr
.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
Community Loads — Somchem S355
Sample load data calculated with Somchem S355.
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| Cartridge | Bullet | Barrel (in) | Charge (gr) | OAL (in) | Case Volume (GoW) | Max. Pressure (psi) | Muzzle Velocity (fps) |
|---|---|---|---|---|---|---|---|
| .257 | 110gr | Hornady ELD-X | 23.6 | 45.2 | 3.16 | 61.7 | 58,929 (90%) | 3002 | |
| .277 | 150gr | Speer Grand Slam | 22.4 | 46.0 | 3.34 | 67.0 | 59,161 (95%) | 2723 | |
| .277 | 150gr | Speer Grand Slam | 22.4 | ••.• | 3.29 | 67.0 | 51,928 (83%) | 2657 | |
| .277 | 150gr | Speer Grand Slam | 22.4 | ••.• | 3.34 | 67.0 | 50,778 (81%) | 2644 | |
| .277 | 150gr | Speer Grand Slam | 22.4 | 45.0 | 3.29 | 67.0 | 48,972 (79%) | 2612 | |
| .308 | 150gr | Hornady SST InterLock L1.12 | 22.4 | ••.• | 3.21 | 68.2 | 37,289 (63%) | 2552 | |
| .308 | 175gr | Berger VLD Target | 26.0 | ••.• | 3.34 | 90.5 | 55,317 (89%) | 2904 | |
| .311 | 180gr | Sellier & Bellot FMJ | 15.0 | ••.• | 3.07 | 56.0 | 37,565 (71%) | 2067 | |
| .312 | 185gr | LEE Mold C312-185-1R | 15.0 | ••.• | 3.07 | 56.0 | 35,027 (66%) | 2018 | |
| .311 | 180gr | Sellier & Bellot SPRN | 15.0 | ••.• | 3.07 | 56.0 | 33,852 (64%) | 2001 | |
| .308 | 150gr | Hornady InterLock RN | 22.0 | ••.• | 2.74 | 56.0 | 38,020 (63%) | 2497 | |
| .338 | 225gr | Hornady SST InterLock | 24.1 | ••.• | 3.34 | 73.9 | 51,146 (81%) | 2549 | |
| .338 | 225gr | Hornady SST InterLock | 24.1 | ••.• | 3.34 | 73.9 | 48,563 (77%) | 2510 | |
| .375 | 250gr | Frontier PH HPFB | 25.0 | ••.• | 3.60 | 95.3 | 62,033 (99%) | 2831 | |
| .375 | 250gr | Frontier PH HPFB | 25.0 | ••.• | 3.60 | 95.3 | 59,393 (95%) | 2802 | |
| .375 | 250gr | Frontier PH HPFB | 25.0 | ••.• | 3.60 | 95.3 | 56,884 (91%) | 2766 | |
| .375 | 250gr | Frontier PH HPFB | 25.0 | ••.• | 3.60 | 95.3 | 54,462 (87%) | 2733 | |
| .375 | 250gr | Frontier PH HPBT | 25.0 | ••.• | 3.60 | 95.3 | 53,635 (86%) | 2726 |
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