military brass grain reduction?

[silver2525]

M1 garand reloading.

i have HXP (greek Brass) and I have read reduce a few grains and other times 10% or 15% because it is thicker military brass.....


I reloaded 7 rounds with greek HXP brass....

150 grain bullets
Hornady 7th edition reloading manual m1 garand section.

43 grains of varget (Min is 42.3grains and Max is 46.2 grains)

10% is 4.23 grains ........43 - 4.23 = 38.77grains Well below book min
15% is 6.45 grains .......43 - 6.45 = 36.55 grains even lower....

Im confused. any and all opinions welcome.

 

[rcmodel]

They mean to reduce the MAX load, not the Starting load.

The Starting load is already reduced at least 10% from the MAX load.
Don't reduce it any more to try to account for differences in brass.

Anyway, GI brass does not need a 10% - 15% reduction.

A grain or two below max, maybe.

rc

 

[rg1]

Not necessary with HXP brass to download. I shoot the same loads in Win, RP, LC, and HXP 30-06 brass for M1 Garand loading. I shoot mostly 150 grain weight bullets with IMR 4895 powder at around 47.5 grains. Good practice when working up loads to drop back and work up with untested components but you won't have issues with Garand loads with HXP brass. HXP brass weighs less than some commercial 30-06. Just the same as Remington is heavier than a Winchester case and Federal tends to be the heaviest commercial case. Like many will tell you, the only way to compare case volume is to fill them with water and weigh the water from each case. Don't have the data now but HXP is heavier than Winchester but lighter than Remington and Federal and close in weight to LC military. Different lots of brass may vary. You may get slightly different velocities between different cases but at Garand charge levels using approved Garand powders, you won't run into problems with HXP brass other than having to remove the stab crimp primer pocket marks.

 

[USSR]

rg1 is correct when it comes to military .30-06. It simply is not the same situation as it is with 7.62x51 and .308, in which .308 loads in 7.62x51 brass must be reduced. I use the same loads in .30-06 LC Match and Lapua brass, and velocity/pressure is the same.

Don

 

[silver2525]

thank you for the input. i was concerned. but now i will have fun.