Alternative Calibers for the Garand

[centurion20000]

IDEA ....


Compared to 30-06 / 35 Whelen ... 375 Ruger



Another ultimate round you could rechamber a Garand in ....
416 Ruger


405gr at 2500+ fps

[majbdrake]

Took the "Heretic" Garand to a 100 yard NRA Reduced Course Garand/M1A Match last week for its first match. She didn't disappoint as it shot well enough for me to take 2nd place behind a double lugged M1A. With a little more tweaking, I may even beat that guy the next time I bring the Heretic to a match.

Bruce

[Old Guard]

Took the "Heretic" Garand to a 100 yard NRA Reduced Course Garand/M1A Match last week for its first match. She didn't disappoint as it shot well enough for me to take 2nd place behind a double lugged M1A. With a little more tweaking, I may even beat that guy the next time I bring the Heretic to a match.

Bruce

Good news, Its working very well now? OG.

[Punch The Clown]

Original Garand T3e1 in .276 circa 1929.

[musketjon]

Come on Bruce, you know the rules. Pictures or it never happened.
Jon

[kwg020]

I would really like one in .270. But there are other priorities. I just think it would be a screamer.
kwg

[centurion20000]

358/375 Ruger would actually fit perfectly and be a 35 magnum caliber (no gas/no major barrel mods). 5 shot (tight packed clip). 358/375 Ruger is basically a reinvented 35 Newton. Wider boldface needed but same COAL as a 30-05

It's ballistic capabilities are; 250 grain at 2850 to 2900 fps. Or the great 280 grain Swift A-frame at 2650 fps.

It's a wildcat but it would make one heck of a moose/kodiak rifle.

And all you need is a reamer and the go/no-go gauges and an adjustable plug.

[centurion20000]

What is the widest rim that the M1 Garand bolt face can accomodate at 60+ kpsi?

30-06 family
Rim diameter .473 in (12.0 mm)

375 Ruger
Rim diameter .532 in (13.5 mm)

[Shug]

What is the widest rim that the M1 Garand bolt face can accomodate at 60+ kpsi?

30-06 family
Rim diameter .473 in (12.0 mm)

375 Ruger
Rim diameter .532 in (13.5 mm)

Ruger bolt would have 1.27x the bolt thrust on it as the 30-06 bolt, assuming the same pressure in kpsi. But that is theoretical; real world might be very different because the physics behind bolt thrust are more complex than just a linear relationship to surface area and chamber pressure.

Some real world stuff that would need to be taken into account if you're actually engineering a rechambering:
- Coefficient of static and dynamic friction between the cartridge wall and chamber wall
- Stress/strain curves for plastic deformation of wall brass and modulus of elasticity for same
- Pressure curve the cartridge as a function of time
- and lots of other phenomena

[centurion20000]

So has anyone given any thought to a BM=59 or a Garand perhaps chambered in 277 Fury?

135 gr at 3000+ feet out of a clip or a 20 round M14 mag sounds like one interesting sleeper rifle.

https://en.m.wikipedia.org/wiki/.277_FURY

277 Fury.jpg


Basically it's a 270-08 with a steel baseplate so it can handle 80K PSI and correct me if I'm wrong but the Garand receiver is about the strongest out there (see Hatcher's Notes).

277 Fury Wiki Quote

The .277 FURY or 6.8×51mm,[3] (designated as the .277 SIG FURY by the SAAMI[1]) is a centerfire rimless bottlenecked rifle cartridge announced by SIG Sauer in late 2019. It utilizes a hybrid three-piece cartridge case that has a steel case head, brass body and a locking washer that mechanically connects the two to support a chamber pressure of 80,000 psi (551.6 MPa).

Specifications
The cartridge uses a case that is the same length and diameter as the .308 Winchester.[7] Each cartridge case consists of a stainless steel base coupled to a brass body via a locking washer.[8][9] Stainless steel has a significant higher yield strength than brass, allowing the engineers to use higher Maximum Average Pressure (MAP) chamber pressure levels.[10] Bullets are either 135 grains (8.7 g) "match grade" or 140 grains (9.1 g) "hunter tipped".[9] The SAAMI warns that Maximum Average Pressure levels greater than 65,000 psi (448.2 MPa) may present increased risk of unsafe cartridge case or firearm rupture and thus require cartridge case and/or firearm designs that depart from traditional practices (materials, construction, and other design criteria).[1][11][12]

The .277 FURY SAAMI (voluntary) Maximum Average Pressure (MAP) chamber pressure of 80,000 psi (551.6 MPa) enables a 135 grains (8.7 g) projectile muzzle velocity of 3,000 feet per second (914 m/s) from a 16-inch (406 mm) barrel.[1][7] It also means that the .277 FURY should only be chambered in small arms that are capable of handling the accompanying bolt thrust safely.

Performance
SIG Sauer claims that the cartridge has performance superior to the 6.5mm Creedmoor, exhibiting 6 to 9 feet (1.8 to 2.7 m) less bullet drop at 1,000 yards (914 m), while delivering 20–25% greater energy.[9]