Description
Anybody who runs a .41 Magnum revolver knows the pain of topping off the cylinder round by round, especially when your hands are cold or you are on the clock. The HKS 57M takes care of that. It cradles all six .41 Rem Mag cartridges in one unit, and a single twist of the knurled metal knob releases them into the chambers at once. Strong internal points grip the case rims so nothing rattles loose in your pocket or pouch until you actually want it out.
What Sets the HKS 57M Apart
This one belongs to HKS's "M" Series, and that letter matters. The M models are built to work with a little cartridge jiggle, meaning the rounds have some intentional play so they line up and drop clean even if the loader and cylinder are not perfectly indexed. It sounds like a small thing, but under stress or in the dark it makes reloads a lot more forgiving. The twist-knob release is the same proven design HKS has been turning out for decades, and plenty of longtime revolver folks will tell you these things just keep working year after year.
Fitment for Your .41 Magnum Revolver
The 57M is cut for the Smith & Wesson Model 57 and Model 58 N-frames, along with Ruger large-frame .41 Magnum cylinders. One thing worth checking before you buy: oversized or aftermarket grips can sometimes crowd the loader and keep the rounds from dropping free. If your revolver wears chunky target grips, you may need to trim or swap them so the loader clears on release. Stock grips generally give you all the room you need.
Carrying the HKS 57M
The body is molded from durable black polymer with a metal knob, and it fits a large-size speedloader case if you want to run one on your belt for the range, the trail, or time in the woods. It is a simple, rugged piece of kit that earns its spot in your gear bag. Grab a spare or two, and you will always have a fast six ready to go.
Key Specifications
- Manufacturer: HKS
- Model: M Series (57M)
- Manufacturer Part Number: 57M
- UPC: 088652000579
- Caliber: .41 Remington Magnum
- Capacity: 6 Rounds
- Release Type: Twist Knob
- Body Material: Black Polymer with Metal Knob
- Color: Black
- Fits: S&W 57, 58; Ruger large-frame
- Case Size: Large-size speedloader case
- Country of Origin: Made in USA
- Length: 6.2 in
What’s Included
- One HKS 57M M Series revolver speedloader
Frequently Asked Questions
What revolvers does the HKS 57M speedloader fit?
The 57M is made for .41 Remington Magnum revolvers, specifically the Smith & Wesson Model 57 and Model 58 N-frames along with Ruger large-frame cylinders. If you run oversized aftermarket grips, check that they do not block the loader from releasing rounds cleanly. Stock grips typically leave plenty of clearance.
How does the HKS 57M release the cartridges?
It uses HKS's classic twist-knob design. You seat the loader over the open cylinder, give the knurled knob a slight turn, and all six rounds drop into the chambers at once. Metal points inside hold the case rims securely until that twist releases them.
What does the "M" in M Series mean?
The M Series loaders are designed to work best with a bit of cartridge jiggle, meaning the rounds have some intentional play in the loader. That small amount of movement helps the cartridges self-align and drop in even when the loader and cylinder are not perfectly lined up, which makes reloads more forgiving under pressure.
Does the 57M fit a belt speedloader pouch?
Yes. It is sized to fit a large-size speedloader case, so you can carry one or two on a belt for range work, hunting, or time in the field. Keeping a loaded spare on hand means a fast six is always within reach.



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