Underwood Ammunition 115 grain JHP 356TSW

[356TSW]

Underwood Ammunition is one of the various vendors that is re-introducing the 356TSW Cartridge

At this time Underwood is offering two loadings.

First up is a 115 grain JHP

Image courtesy of Underwood Ammunition

Loaded with a Nosler projectile, the manufacturer claims an impressive 1600 fps muzzle velocity yielding 654 ft lbs of muzzle energy

[356TSW]

I have some velocity measurements that are a bit more specific

Using a 3566 Limited and a 3566 compact

The 5" barreled 3566 Limited produced an average of 1596 FPS

The 3 1/2" barreled 3566 Compact produced an average of 1482 FPS

The 115 grain Nosler JHP penetrated 12" of ballistic gel

[s537]

An update on the 356 TSW Glock 17 & Glock 19 Briley barrel conversion kits, Corbon 115 grain JHP and Underwood 115 grain JHP: during testing in June 2020 Corbon averaged about 1612 fps from the Glock 17 conversion kit and about 1569 fps from the Glock 19 conversion kit. Underwood averaged about 1570 fps from the Glock 17 conversion kit and about 1540 fps from the Glock 19 conversion kit. Accuracy and feeding were good, no anomalies were observed. Starline makes strong brass, Corbon and Underwood load great ammo, ISMI springs and LWD guide rods are first rate, and the Briley barrels are top notch. Glocks are....Glocks, and with 356 TSW they are that much better.

Ammo is available through Ammoseek, Corbon, Underwood, Selway, Midway.

356 TSW Glock conversion kits are available on Gunbroker.

Look for others to catch up at some point with even more options (Apex/Hornady)?