Re: Bolt handle tight to lift up on some shots.
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.