Somewhere around here I have an old magazine, maybe "NZ Guns", with an article where a bloke scrounged around in the earth backstop at a rifle range and picked up a bunch of fired-but-mint 7.62 mm FMJ match projectiles.
He loaded them up, fired them in a .308 and as I recall they shot pretty well.
You'd think the previous rifling marks would've allowed gas to blow past the projectile but it seemed not.
Will try and find the article...
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