M1 Garand load work up question

[GetReal]

 

[Doom]

I saved this part of a discussion with the retired head ballistician from Hornady, as I thought it was quite interesting:View attachment 1757872

Any idea what brass he used? It gets complicated with Hornady and maybe Win brass as they have a good bit more volume. Most of the military brass isn't that far apart.

 

[Doom]

It's been awhile since I have worked up any loads for the M1 Garand, but I need to work up a new load using 168gr HPBT bullets. Anyway, my inclination is to ladder up charge weights in 8 shot groups, so I can just load each charge weight in an en bloc and shoot them. But it occurred to me that I could use a SLED and single load them and use 5 shot groups. That would exacerbate any issues with first round fliers when loading a fresh clip, but maybe it doesn't matter.

Is there a best practice for number of shots in a group for M1 Garands?

While I'm sure there are many of us with knowledge and experience with the Garand, the best source of information to be had is on the Civilian Marksmanship forum (https://forums.thecmp.org/index.php).

 

[SSchnd]

Planning on starting with IMR4064 and H4895. Some work is required to check velocities and get the charge weight correct. Some working around the recommended charge weights is usually required due to lot variation of powders, bullets, etc.

Run 46.5 gr either H 4895 or IMR 4895 in all my M1 (30-06 not 308 ones) with 110 Vmax, 150-155, 168 projectiles

The old boys who got me started in Across the Course gave me that load. Never fails.

My issued M1 will clean the SR target at 200 prone with any of these including old HXP issued ammo.

 

[GetReal]

A whole library for an M1 owner. Its not just a gun.... its a calling...

 

[OldM1Shooter]

Just run QuickLOAD with YOUR fired case’s water capacity and add a couple of hundred PSI to the pressure at the muzzle for your port pressure. You WILL find a lot of internet lore on M1 Garand is just plain wrong. Do NOT trust any AI on this because it merely regurgitates the incorrect information. Specific example: back in the day, IMR 4320 was a less popular but common enough powder among Service Rifle shooters. If you believe IMR 4064 is okay, so is 4320. NOT to be confyoozed with any of the 4350s.

 

[fatelvis]

Any idea what brass he used? It gets complicated with Hornady and maybe Win brass as they have a good bit more volume. Most of the military brass isn't that far apart.

If I remember correctly, he was referring to Hornady's factory Garand ammo, so it would probably be Hornady brass.

 

[charlie b]

When I did loads for mine I used the 5 round clips made for hunting (where states restrict magazines to 5 shots).