Home Forums Hunting & Shooting Hunter's Campfire M1 Garand in 458 Win mag....

I want one

Notice he has a nice recoil pad on it.

I still want one

Talk to this guy.

http://forum.shuffsparkerizing.com/search.php?searchid=143529

kwg

I'm thinkin' you'd need a plentiful supply of operating rods.

Not if the porting is done correctly and the proper burn rate of powder is used.

It would have to be properly engineered. It appears some attention was paid to that, the ejection doesn't seem to be overly violent.

Then there are those adjustable plugs.

Maybe so.

Yep, you can do about anything with a gas operated gun if its worked up correctly.

You just have to understand how they work and what they need on a burning curve and how much port presssure you'll end up with.

In fact its a guess of mine with proper porting you could run M1 06 with powders you are not supposed to, if the calcs and porting were changed.

Its how we came up with running the 90s in 223 AR15 with no issues. Without smaller ports the 90s and their powder were not a great thing, lots of rim lifts from the first go round when we knew we had no pressure to speak of yet.

You are correct. Adjustable plugs are available in two designs, called the Schuster and McCann plugs, that feature adjustable orifices for bleeding off excess gas pressure.

A third and interesting design is by Eric Claypool, called the Ported Plug, and uses the principle of volume of area to lessen the peak pressure but provides a larger volume to continue to operate the action. A lower peak but more time under the curve. This allows for slower powders and heavier bullets to be used.

You can read his write-up and view well-presented data on his webpage, GarandGear.

No maybe. It's a fact.

Isn't the whole idea of a semi-auto to get multiple shots on target?

+1

Yup,......Forget 'maybe", chitcan the skepticism. That system defines adaptability, .....and in this country, properly engineering something is not about pipe dreams.

Neat stuff !

GTC

It's a balance of mass (bolt), spring rates, velocity of the bullet in the barrel (this affects time under the curve), and how much ooomph, in both volume and pressure, is needed at the piston. There are other factors, but this is a simple version so I can understand it.

The shape of the Op-rod will lend itself to bending, and even ol' John C. said it could use improvement, but the Government took it as it was.

The version we know and love so well is an adaptation of his original design for a smaller caliber, but Gen. MacArthur (SP?) was adamant about it being in .30-gov.

MacArthur was right too. We had 30-06 rounds, and logistics won the war.

Absolutely

They are the real McCoy and were built here in WA (not sure if they are still around) . A few buddies had them in .458WM and .338WM. IIRC they run like $2200.

Google McCann Industries for more info.

That's because in it's standard configuration it is not set up for a steady diet of 190 grain bullets. There are ways to work around that. Schuster and McCann plugs are one way, easily obtained and not expensive at about $35. I know guys who are running 208 AMAXs and IMR4350 with the right mods. Which is those 35 dollar plugs.

A Garand's gas system is designed around the M1 and M2 loads, more specifically the M2. If you get away from those loads in powder burn rate or bullet weight (150 to 175 grain), you will bend the op-rod.

Tune the system to the load and you'll be good to go.

Heavy bullets play havoc with a standard Garand gas system due to the time under the pressure curve as much as total pressure due to the lower velocity, giving the system time to take on more volume of gas and continue to accelerate even if the burn rate of the powder is correct. This can lead to battering and bending from continued use due to the reciprocating parts moving too fast. The heel of the receiver can become another area that fails, too.

Increasing the volumetric capacity of your system(GarandGear), or bleeding the excess off(McCann or Shuster), will allow you to eliminate or significantly reduce any problems you may have. Keep the reciprocating speed near design parameters and your parts will last.

I use the GarandGear plug in mine.

I haven't built a whole lot of Garands, and the ones I have only have been in .30-06 and .308. But looking at the ejection pattern, I'd say that particular gas system is pretty well engineered correctly.

The .458 Win ought to be a great cartridge in the M1 gas-wise. It uses relatively fast powders which should give fairly low port pressure.

The only real problem I see is bedding. M1s don't have great bedding surfaces and soft stocks (like beech) shoot loose quite rapidly just from the recoil of 30/06. I'd have the receiver lugged and use a laminate stock.

as i posted on another thread: Interesting enough saturday i went to look at a mint asaki landing rifle that a 90 year old vet had. he was considering selling, and i told him i was interested.
he was on McArthur's staff in 1946 in japan. He showed me a loaded round he had confused with going with the asaki. It was a 1935 F.A. (frankfurt arsonel) 30.06 round that he had brought home with him. Interesting in that it was made 10years prior to the conclusion of the war. While the m1 Garand was to be basically a .270, all that ammo is what influenced the decision for 30.06. I have some spam cans of ammo dating back to WWII in the pacific. Almost tempting, to open it to see the headstamps, but not going to do it.
The japanese rife by the way was pristine, with the mum on it, leather sling, mint bayonet/scabbard. only hope he sells it to me.