minte,
Jack got it right. The Garand is a robust arm, but stay with 150 and 165 grain ammo at about Ball M2 pressures. Use powders in the IMR 4895 range and you will do fine. I have seen Garands with bent operating rods from too high pressures with heavy bullets and heavy, near max, loads. I know a fellow who broke several accelerators on his Garand because he had some IMR4831 and used that for near max loads with heavy bullets.
Adam
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Adam Helmer
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