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The powders typically used in commercial hunting ammo is too slow and crates too much pressure at teh gas port, thus battering the op rod over time. It won't destroy it right away but will be impacting it harder than for what it was designed.
- Use GI ammo, the cheapest being from CMP for about $0.50/round compared to $1/round commercial.
- Use commercial ammo specifically made for the Garand. Again cheapest is the Hornady sold by CMP, ut others make some too.
- Handload with 147 - 168 gr bullets at or below 2,700 fps using powders in the range of IMR4895 (H335, H4895, TAC, Varget, IMR4064). See Hornady or Sierra manuals.
- Get an adjustable gas port and tune it for your chosen ammo of any brand or type.
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"The ultimate authority ... resides in the people alone. ... The advantage of being armed, which the Americans possess over the people of almost every other nation ... forms a barrier against the enterprises of ambition." - James Madison
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