Is S365 good for .300 Winchester Magnum?

S365 is commonly listed for .300 Winchester Magnum (burn-rate rank #73). Other powders reloaders use for .300 Winchester Magnum include N550, Superperformance, N555. Verify charges against a published load manual.

Is S365 good for .375 H&H Magnum?

S365 is commonly listed for .375 H&H Magnum (burn-rate rank #73). Other powders reloaders use for .375 H&H Magnum include Norma 201, Norma 200, N135. Verify charges against a published load manual.

Is S365 good for .338 Lapua Magnum?

S365 is commonly listed for .338 Lapua Magnum (burn-rate rank #73). Other powders reloaders use for .338 Lapua Magnum include N560, Norma MRP, Vihtavuori N160. Verify charges against a published load manual.

Lindcott Armory

Somchem · Extruded

S365

Ultra-slow extruded Somchem powder for the largest magnum cases.

Manufacturer: Somchem
Grain shape: Extruded
Burn rank: #73
Category: Medium-Slow
Temp sensitivity: Low
Application: Rifle
Origin: South Africa
Status: Active

Burn-rate position

FastestSlowest

Rank #73 on the burn-rate scale · Medium-Slow

Typical cartridges

.300 Winchester Magnum, .375 H&H Magnum, .338 Lapua Magnum

By cartridge

.300 Winchester Magnum also used: N550, Superperformance, N555

.375 H&H Magnum also used: Norma 201, Norma 200, N135

.338 Lapua Magnum also used: N560, Norma MRP, Vihtavuori N160

Similar burn rate

#73Alliant Reloader 22Alliant #73N565Vihtavuori #73N165Vihtavuori #73AR 2217ADI #73N570Vihtavuori

Supply & handling

Availability (US): Limited
Shortage-prone: No
Suppressor-friendly: Yes
Flash-suppressed: No

About this powder

Somchem S365 is a very slow South African rifle ball powder for large magnum and ultra-magnum rifle cartridges including .338 Lapua. Very limited US distribution.

ChartSee it on the burn-rate spectrum BrowseEvery powder, ranked by burn rate

Sources & provenance

Manufacturer Somchem — Somchem — published load/burn-rate data