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Old 05-26-2019, 09:43 PM
pickax pickax is offline
 
Join Date: Jan 2011
Location: Daytona Beach Fla.
Posts: 991
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Ericc did as complete study with the right instruments a few years ago, developing his barrel port plug.
He brought all info to this forum seeking input, and it may be searchable.
This from his website, albeit getting dated on commercial ammo.
http://www.garandgear.com/m1-garand-ammunition.

I'm not surprised newer "Garand safe" ammo is downloaded.
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