Preview: The Shooter’s Box | .577/450 Martini-Henry Chamber Adapter

by
posted on August 21, 2022
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
.577/450 Martini-Henry Chamber Adapter

Thanks to the discovery of a cache of Martini-Henry (MH) rifles in Nepal in 2000, many of these 19th century military arms are commonly available in the U.S., but compatible .577/450 MH ammunition is far less plentiful.

The Shooter’s Box enables MH owners to fire easily obtainable .45 Colt rounds through their rifles, thanks to its U.S.-made, stainless-steel chamber adapter machined to the dimensions of a standard .577/450 cartridge. The adapter provides a clear throat that allows fired .45 Colt projectiles to enter the gun’s rifling.

Due to variances in chamber dimensions, the adapter may not work in all guns, and accuracy can be somewhat lacking, due to varying bore diameters in MH rifles. The price is $69 per adapter.

For more information, please visit theshootersbox.com.

Latest

smith & wesson performance center model 19 carry comp moss
smith & wesson performance center model 19 carry comp moss

Unlocking The Future: Smith & Wesson's "No Lock" Revolvers

The future is shaping up to be a good one for fans of Smith & Wesson revolvers. The iconic American company had released 14 new models thus far in 2025 at the time this was written mid-year. And, with one exception, they have all shared a common feature—no internal lock.

The Armed Citizen® Oct. 6, 2025

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

FEMA Notes Decline In Disaster Preparedness

A recent report from the Federal Emergency Management Administration (FEMA) noted a decline in local government preparedness for natural disasters, putting increased pressure on individuals to prepare themselves for emergencies.

Army Announces Type Classification Of New Infantry Rifle, Machine Gun

In May 2025, the U.S. Army’s Soldier Lethality Project at the Picatinny Arsenal in New Jersey announced the official type classification of SIG Sauer’s M7 rifle and M250 automatic rifle, previously known as the XM7 and the XM250, respectively.

RXR22: Savage Arms Redefines The Budget Rimfire Rifle

Savage Arms has a long history of producing affordable and accurate rimfire rifles, but with its RXR22, the company is bringing a new level of affordability and modularity to rimfire rifle fans.

SARCO: A Lifetime Covered Up With Surplus Firearm Parts

When it comes to selling gun parts and gun-related military surplus, Charles “Cholly” Steen has been at it for longer than almost anyone. It all started when, as a 5-year-old, he began stashing odds and ends in the drawers of his clothes dresser.

Interests



Get the best of American Rifleman delivered to your inbox.