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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can you polish a barrel to make it more accurate ?
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<blockquote data-quote="Bart B" data-source="post: 1795983" data-attributes="member: 5302"><p>A little known fact about some very accurate barrels was about the 7.62 NATO Garand barrels made at the Springfield arsenal in MA for the US Navy. Single pass broach rifled 1:12 twist 4 groove barrels. Air gauged for groove diameters and those made near the end of life for the broach were about .3078". With 190 grain Sierra's over IMR4320 in primed new M118 match cases shot in well rebuilt match M1 rifles with such barrels, they tested under 4 inches at 600 yards. Bore surface was estimated at 30 to 40 microinch.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1795983, member: 5302"] A little known fact about some very accurate barrels was about the 7.62 NATO Garand barrels made at the Springfield arsenal in MA for the US Navy. Single pass broach rifled 1:12 twist 4 groove barrels. Air gauged for groove diameters and those made near the end of life for the broach were about .3078". With 190 grain Sierra's over IMR4320 in primed new M118 match cases shot in well rebuilt match M1 rifles with such barrels, they tested under 4 inches at 600 yards. Bore surface was estimated at 30 to 40 microinch. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can you polish a barrel to make it more accurate ?
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