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Message: <blockquote data-quote="1911user" data-source="post: 966223" data-attributes="member: 57493">Just the opposite, it's the slow rifle powders (along with heavy bullets) that are the problem.  The op rod doesn't see pressure until the bullet has almost exited the barrel.  The gas port is at the end of the barrel unlike more current designs.  You might check, but I recall the 150gr federal American Eagle 30-06 ammo was ok for a Garand.  30 M2 Ball military ammo is/was loaded to a lower peak pressure than many commercial 30-06 offerings.  An adjustable, vented gas plug is the easy solution to using a wide range of factory 30-06 loads.  It's like the gas adjustment on an FN-FAL.</blockquote>