Hsm Subsonic 10Mm Hitek 240Gr Hcfn 20/20

HSM Subsonic 10mm ammunition delivers controllable, hearing-safe performance for shooters who want to keep noise levels down without sacrificing stopping power. Built with a 240-grain hard cast flat nose bullet and Hi-Tek Supercoat, this round is engineered for modern 10mm firearms and optimized for subsonic velocities. The 240-grain projectile design—heavier than standard 10mm loads—generates substantial energy in a subsonic platform, making it a solid choice for suppressed shooting, range sessions where noise matters, or hunting applications where sound signature is a consideration.

The hard cast bullet construction and Hi-Tek coating reduce fouling and improve barrel life, especially during high-round-count sessions. With a muzzle velocity of 1017 feet per second from a 16-inch barrel and 551 foot-pounds of energy, these rounds stay subsonic while maintaining the momentum and penetration that the 10mm platform is known for. At 1.250 inches overall length, they'll chamber reliably in standard 10mm magazines and firearms.

HSM Subsonic 10mm rounds are suitable for all modern 10mm firearms, though HSM recommends a rifling twist of 1:36 or faster for optimal stabilization of the heavier projectile. Whether you're running a 1911-platform 10mm, a Glock 20, or any other contemporary design, these loads deliver the subsonic ballistics and hard-hitting penetration serious 10mm shooters demand.

Key Features

• 240-grain hard cast flat nose bullet for deep penetration and barrier performance
• Hi-Tek Supercoat reduces fouling and extends barrel life
• Subsonic velocity (1017 fps from 16" barrel) keeps noise levels down
• 551 foot-pounds of muzzle energy from a heavy, dedicated projectile
• 1.250" overall cartridge length fits standard 10mm magazines and chambers
• Compatible with all modern 10mm platforms (1911s, ARs, semi-auto pistols, revolvers)

Specifications

Frequently Asked Questions

What firearms will this 10mm ammo work in?

HSM Subsonic 10mm is suitable for all modern 10mm firearms, including semi-automatic pistols, 1911 platforms, AR-10 uppers in 10mm, and other contemporary designs. HSM recommends a rifling twist of 1:36 or faster for the heavier 240-grain projectile.

Is this ammo truly subsonic, and will it work with a suppressor?

Yes—at 1017 feet per second from a 16-inch barrel, this load is subsonic, meaning it stays below the sound barrier. That makes it suitable for suppressed shooting or any application where you want hearing-safe performance from your 10mm.

What's the difference between this and standard 10mm loads?

The 240-grain hard cast flat nose bullet is heavier than typical 10mm offerings, and the subsonic velocity makes it much quieter. The hard cast construction with Hi-Tek Supercoat is designed for deep penetration, barrier performance, and reduced fouling—better for serious hunting and range work where durability matters.

How much ammunition is in a box?

Each box contains 20 rounds. The product designation (20/20) indicates 20 rounds per box and 20 boxes per case.