Henry Big Boy 357 Mag Steel Side Loading Gate 20" Barrel H012GM

$1,049.00 $949.00


While we are fond of the brass tradition begun by B.T. Henry’s 1860 rifle, we do understand that today’s hunter may prefer something a shade lighter on the mountain, and the Big Boy Steel Side Gate carries on the same brush gun appeal of the brass-framed Big Boys in its overall configuration, but with upgraded features for the modern hunter, while weighing in 1.68lbs. less than its cousin.

These Side Gate models come in .357 Mag/.38 Special, .44 Mag/.44 Special, and .45 Colt, with either a standard 20” round barrel and regular lever, or a compact 16.5” round barrel and a large-loop lever for gloved cold-weather use and extra style points. Both models feature fine checkering on the genuine American walnut fore-end and straight-wrist stock, range-adjustable semi-buckhorn rear and brass bead front sights, an automatic in-hammer transfer bar safety, and our best-of-both-worlds side loading gate and removable tube magazine configuration. Rifles hold ten rounds in the tube, and carbines hold seven.

Together with a trusty revolver in the same caliber, these rifles and carbines make the most of Cowboy Logistics, reducing the weight of the ammunition required on the trail. They fit saddle scabbards snugly, with the milder report of pistol-caliber cartridges being easier on the horse ears. The carbine makes as handy a trail partner in dense woodland undergrowth as it does in off-road vehicles and trucks.

Traditional in appearance, pistol-caliber Big Boys are drilled and tapped for optic mounts for rapid target acquisition with red dots and longer reach with magnified scopes. Long barrels produce a substantial velocity increase with Magnum pistol cartridges, approaching the conventional rifle levels while offering greater tube magazine capacity and shorter lever throws thanks to shorter cases. Smooth, dependable actions and inherent accuracy of Henry barrels add up to enjoyable handling and effective performance on game and paper targets alike.

A perfect choice for straight-walled cartridge hunting laws in Ohio, Indiana, Southern Michigan, and those pending in other areas; with its subdued no-spook-em dark finish and easy-to-maneuver dimensions, we’ve got that brand new deer rifle you’ve been looking for right here.


Model Number


Action Type

Lever Action


.357 Magnum/.38 Spl


10 Rounds

Additional Specifications

Barrel Length


Barrel Type

Round Blued Steel

Rate of Twist


Overall Length



7.00 lbs.

Receiver Finish

Blued Steel

Rear Sight

Fully Adj. Semi-Buckhorn w/ Diamond Insert

Front Sight

Brass Bead


Drilled and Tapped

Scope Mount Type


Stock Material

American Walnut


Black Solid Rubber Recoil Pad

Length of Pull



Transfer Bar

Best Uses

Target/Hunting/Large Game


Swivel Studs, Side Gate

Categories: Lever Action Rifles
Condition: New
Manufacturer: Henry Repeating Arms
Model: Big Boy
Caliber: 357 Mag
SKU: 619835200365
UPC: 619835200365
Vendor: Gunprime
Reviews (3)
By Jed76 on 01/03/24
Perfect for side by side

Had been looking for a Henry in 357 magnum for a year. Gun prime had in stock according to website, gave them a call and they had one in stock
Since I live only an hour from their store they put it behind counter and I went and got it
Shoots great out of the Box. My 5th firearm purchase from these wonderful folks

By c som on 04/05/23
awesome way to buy a gun

I purchased a Henry lever action 357 rifle and it was a VERY easy way to purchase and the amount of time shipped to the FFL dealer was just a few days.
The gun arrived in the original box and in new condition.
thanks for making this experience an excellent way to buy a rifle.

By Phil on 01/04/23

let me kow when you have a side gate lever acton in octogon barrel.

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