Originally Posted by Archie
Soundguy, the 'too low' powder charge problem is in connection with slower powders. Garands (and most other gas operated rifles) use a middle speed powder, 4895 or such. These powders have a wider range of use and do not cause the light charge problems as do 4831 and slower.
For a Garand, it is important the pressure level be within certain limits as the bullet passes the gas port. Too low a pressure and the gun doesn't work; too high and the operating rod bends. What is deceptive is the bullet can be going at pretty much the 'correct' velocity and the pressure range not be right.
If you have a reputable loading manual, you should not have any problems in the regard. I'm of the school that more loading manuals are better.
same here on manuals.. i have all the major ones.. lee, hornady, lyman, speer, sierra, nosler, plus a good stack of small publications with data.. mostly some imr stuff and some shooter magazines with a center data section.
I mainly load in imr 4064, so I read up in all the manuals before selecting a starting charge level.. imr 4064 has data available in the garand section of the manuals that list it.. though it is a hair lower than the 30-06sprngfld guessing medium ... tis interesting to look at many of the special loadings you see as well.. like the 308 svc rifle load data m14 etc..